Ruslan Melentiev | King Abdullah University of Science and Technology (KAUST) (original) (raw)

Drilling CFRP by Ruslan Melentiev

Diamond drilling of Carbon Fiber Reinforced Polymers: Influence of tool grit size and process parameters on workpiece delamination, 2017

The physical and mechanical properties of advanced composite materials promote their application ... more The physical and mechanical properties of advanced composite materials promote their application in structural components for the aerospace and automotive sectors. However, limitations in their machinability are due to anisotropy/inhomogeneity, poor plastic deformation, and abrasive behavior. For CFRP drilling, the process efficiency is heavily influenced by cutting conditions and tool geometry. This paper reports the outcomes of experimental diamond drilling tests. A 4-mm thick carbon-epoxy composite laminate was machined. The plate was made of ten layers, in which the carbon fibers were intertwined at 90°. 6-mm diameter core drills were used. Core drills were characterized by an electroplated bond type and an AC32-H diamond grain type. Four different tool grit size ranges were tested: (1) 63/53 μm, (2) 125/106 μm, (3) 212/180 μm, and (4) 212/180 plus 63/53 μm. The results are reported in terms of workpiece delamination, thrust force, torque, and chip morphology. Overall, the results allow identifying the cutting conditions for the minimum drilling-induced delamination while retaining a satisfactory process productivity.

Effects of tool geometry and process parameters on delamination in CFRP drilling: An overview, 2016

Fiber reinforced polymers (FRPs) show advantageous physical-mechanical, thermal, and dielectric c... more Fiber reinforced polymers (FRPs) show advantageous physical-mechanical, thermal, and dielectric characteristics, making them promising candidates for weight reduction in structural applications. However, machinability is often difficult because of the specificity of their structure. This paper highlights the latest advances in CFRP drilling. Key papers are analyzed with respect to workpiece materials, geometrical tool features, and input variables (such as variation in process parameters). The influence of tool geometry and process parameters on workpiece delamination and hole quality/integrity represents the primary focus of this review. In addition, some new data are presented and discussed.

Micro-Abrasive Jet Machining by Ruslan Melentiev

Surface texturing is an effective approach to improve the tribological performance of artificial ... more Surface texturing is an effective approach to improve the tribological performance of artificial joints. In this paper, the frictional performance of Ultra-High-Molecular-Weight-Polyethylene and Cobalt-Chromium -Molybdenum material combination with micro grooves fabricated on the metal bearings is studied. The results show that grooves with width of 500 μm, depth of 4.5 μm and pitch distance of 3 mm could provide the optimized tribological performance, the coefficient of friction of which can be down to 0.05 showing a reduction of 51.9% compared to that of polished samples without micro grooves. A two-dimensional simulation of hy-drodynamic pressure, based on Reynolds equation, is conducted. It is concluded that hydrodynamic pressure has little effect on the improved tribological performance of textured bioimplants. Otherwise, second lubrication effect induced by the polymer plastic deformation is proved to play a major role in the reduction of coefficient of friction.

Understanding the mechanism for brittle material removal via solid particle impact is important f... more Understanding the mechanism for brittle material removal via solid particle impact is important for various areas such as energy and aerospace industries. The existing analytical formulation of erosion damage, consistent with indentation fracture theory, overestimates actual erosion by over 200%. This study complements an existing analysis by prescribing a realistic shape and mechanical properties to the impinging particle. We quantitatively show that a lateral crack in glass does not nucleate at the indenter's tip or the theoretical plastic depth, but at an intermediate depth. This depth can be found by implementing the actual particle penetration depth into Hill's ratio. Several new geometries of the particle's impacting tip are proposed as ways to achieve adequate particle penetration depth instead of an expanding hemispherical cavity. The crater depth, surface roughness, and erosion efficiency of borosilicate glass are predicted with 10%, 24%, and 23% error, respectively, using a simple analytical routine.

The improved scratch resistance of epoxy-based coatings on titanium alloy is greatly needed in th... more The improved scratch resistance of epoxy-based coatings on titanium alloy is greatly needed in the current biomedical device sector. Due to commercial factors, this improvement must be either non-consumptive or inherited from the antecedent machining steps. This study contributes an extensive understanding of Ti-6Al-4 V surface topography, microstructure, chemistry and wettability generated with various processes, such as milling, polishing, hydrofluoric acid-etching and micro-blasting with different process parameters by utilizing optical and electron microscopy, energy-dispersive X-ray spectroscopy, X-Ray diffraction and surface tension. The phenolic resin is then spin-coated, cured and scratched with a conical indenter in a constant loading mode. The influence of roughness parameters, microstructural and chemical changes on wettability and delamination size, pattern and mode are analyzed. The root mean square gradient of surface slope and the developed interfacial area ratio are found to be in good correlation with the delamination factor. The delamination factor and specific traction force after micro-blasting are improved by a factor of two compared to that achieved by polishing or milling and is superior to that obtained by acid-etching. This study, therefore, clearly demonstrates the strong potential of micro-blasting as a pretreatment technique to enhance the adhesion strength and scratch-resistance of epoxy coating on titanium implants.

A R T I C L E I N F O Keywords: abrasive jet machining micro-machining surface texturing solid pa... more A R T I C L E I N F O Keywords: abrasive jet machining micro-machining surface texturing solid particle erosion artificial joints A B S T R A C T Hectares of tribological micro-texture must be machined per year to reduce friction and wear in artificial ar-ticular joints. Productive and cost-effective tribo-texturing of freeform surfaces consisting of hard-to-machine materials is a current manufacturing challenge. This study evaluates the accuracy and productivity of micro abrasive jet machining when fabricating micro-channels on metal in a mask-less way. The influence of micro abrasive jet process parameters on micro-channel's geometry and fabrication speed is in focus in this study. We blast 27-μm alumina powder through Ø0.5 mm nozzle at Co-Cr-Mo substrate under 0.1-0.8 MPa of air pressure, 30°-90°of nozzle angles and 0.5-3.5 mm of stand-off distance. Measurements show that the micro-channels can be as narrow as 110% of the nozzle diameter and have V-, U-or W-shaped bottom at the particular stand-off distance and air pressure. The fabrication speed of 550 μm × 5 μm channels (width × depth) reaches 260 mm/ min and allows to texture the femoral head of a hip joint within several minutes using a single nozzle and a few grams of abrasives. Overall, the accuracy, productivity and cost-effectiveness of micro abrasive jet machining are highly suitable for tribological surface texturing of artificial joints.

Particle shape factor Surface roughness Developed interfacial area ratio Size effect A B S T R A ... more Particle shape factor Surface roughness Developed interfacial area ratio Size effect A B S T R A C T Specific surface treatments to enhance adhesion, osseointegration and other area-related processes contribute greatly to the cost of manufacturing functional products. It is thus necessary to develop a productive and cost-efficient surface treatment technique for modifying the surface of bio-medical alloys such as Co-Cr-Mo to improve their bio-functionality. This study estimates the capabilities of the micro-blasting technique for a developed bone/implant interfacial area. Eight abrasive fractions of white aluminium oxide were comprehensively measured and blasted at a Co-Cr-Mo substrate. Then, this substrate was analysed in terms of nine roughness parameters. We found no significant variation in convexity, circularity or aspect ratio among 5-300 µm particles. The amplitude and space parameters of the eroded surface were proportional to the particles' kinetic energy, and two hybrid parameters were subject to the particle size effect. The working hypothesis is that the particle size effect on the wear rate and root mean square (RMS) gradient of the surface slope are two aspects of one phenomenon. The size effect is known in a wear issue, yet this is the first time the size effect has been reported in relation to surface morphology. Variation in the RMS gradient with variation in particle size was analytically explained by the relative bluntness theory. The developed interfacial area was proportional to the impact energy and inverse to the tip radius of the particle. Blasting of angular abrasives larger than 60 µm was capable of doubling the surface area, while blasting of abrasives larger than 300 µm produced appropriate topography for mechanical fixation at the bone/implant interface.

This study proposes a novel, cost-efficient and productive technique, Tribo-blast, to tailor surf... more This study proposes a novel, cost-efficient and productive technique, Tribo-blast, to tailor surface topography for tribological purposes. Tribo-blast is based on mask-less micro-blasting with spherical or angular particles and precisely controlled process parameters. This approach enables rapid fabrication of μ-pockets (5-50 μm) on free-form surfaces comprised of any material. A particle with a new 3D geometry-a spinning top-is proposed to match the shape and dimensions of the irregular craters formed in a metallic target by an angular particle at the normal impact angle. The results were experimentally validated on stainless steel 316L, Co-Cr-Mo and Ti-6Al-4V alloys. A simple analytical routine allowed for control over the size, area, concentration and homo-geneity of randomly distributed angular and spherical μ-pockets with <20% error. The Abbott-Firestone curve and texture ratio can be tailored according to one's intended design. The bearing index of the tailored surface was more than two times that of the lapped surface, and fluid retention was increased one hundred times. Thus, this approach is considered to be more productive, cost-effective and simple than current micro-texturing techniques.

Micro-blasting is a non-conventional subtractive micro-manufacturing technology based on erosion ... more Micro-blasting is a non-conventional subtractive micro-manufacturing technology based on erosion localisation and intensification. The thermal aspects of erosion are rarely discussed in the literature and commonly neglected in the analysis of erosion mechanism and quality control of machined surface. This study uses analytical, numerical and experimental approaches to explore erosion temperature in relation to micro-blasting of carbon steels. The research shows that, in terms of temperature, airborne erosion by solid particles is a double-natured process; the surface temperature may increase up to a few thousand degrees Celsius after a single impact, yet it dissipates at the subsurface over several microseconds. Melted and adhered drops of the metallic substrate were found in optical images of abrasive particles and SEM images of a machined surface. EDX elemental analysis confirmed that a thin metal layer was deposited on the particle's interface. Despite this, several FEM models and measurements taken by a thermocouple and IR camera-showed that the steady-state temperature is negligible. The heat generated during each impact has sufficient time to dissipate, leaving a residual temperature of a few degrees before the next impact at the same site. This heat accumulation could elevate the temperature to a few hundred degrees, particularly when the workpiece is small, although convective cooling by air flow effectively dominates this effect. In general, small and slow abrasives are recommended to reduce the temperature. Application of alumina particles smaller than 27 µm to blast low-carbon steels produces minimal negative consequences.

Micro-abrasive jet machining (AJM) is an advanced subtractive machining technology with ample opp... more Micro-abrasive jet machining (AJM) is an advanced subtractive machining technology with ample opportunities to form regular micro-patterns on freeform surfaces. AJM removes material mainly through erosion and abrasion, which transform kinetic energy to fracture and deform substrates. The kinetic energy of a solid particle is tightly connected to its velocity, which is the most significant source of error in precise prediction of a machined feature. The present study involves both theoretical analysis and two-dimensional axisymmetric numerical simulation of particle velocity fields at the lower end of the micro-scale. The developed model represents the finest particles in a cylindrical nozzle down to an inner diameter of 100 μm. The computed results agree well with the experimental data. It is shown that, due to viscous friction, such nozzles are significantly less efficient in terms of particle saturation with kinetic energy. The study highlights the effects of nozzle diameter and length, air pressure, particle size and density on particle velocity development through the jet field. Finally, practical recommendations and multiple regression models of maximum particle velocity, location from the nozzle exit and simplex velocity profile approximation are offered for management of particle kinetic energy.

Recent advances and challenges of abrasive jet machining, 2018

Abrasive jet machining (AJM) is a manufacturing technology based on erosion localization and inte... more Abrasive jet machining (AJM) is a manufacturing technology based on erosion localization and intensification. AJM has a progressively important influence on the machining technology market. Over the past 20 years, there has been an exponential growth in the number of papers that discuss AJM. Various innovations and process developments such as intermittent, submerged, thermally assisted and other jet conditions were proposed. This paper examines AJM’s technological advantages and the variety of machining operations in different industries where AJM is utilized. Particular attention is devoted to the micro-texturing capabilities of powder blasting and its application in tribology. New evidence of ductile and brittle material removal mechanisms are reviewed together with recently discovered elastic removal mode. The effects of hydraulic, abrasive and machining parameters on particles kinetic energy, machined surface roughness and footprint size are described in detail. Nozzle wear has a strong dependence on nozzle materials, its geometry, particles size, hardness, and flow rate. The trend of AJM development is a shift from macro to micro scale. Improvements in micro-machining resolution, process controlling and erosion prediction are current challenges facing AJM.

Bibliometric analysis of micro-nano manufacturing technologies-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0, 2019

Manufacturing is the primary industry promoting economic and social development. For the past 30 ... more Manufacturing is the primary industry promoting economic and social development. For the past 30 years, the global trends of preciseness and device miniaturisation have promoted manufacturing to the micro (μ) and nano (η) scale. Identification of the most promising micro-nano manufacturing technologies (MNMT) is of interest to industry, academia and private and national science investing foundations. Considering the exponential broadening of the research area and an enormous volume of literature, providing an overview of the state of the art is far beyond the scope of a technical review paper. This study performs bibliometric analysis of a stream of academic literature devoted to μ-and η-machining. The main goals of the analysis are to assess the current core and trends in the field of MNMT. Literature and citation statistics from 1988 were collected from the Web of Science , Google Scholar, Scopus, Engineering Village, ScienceDirect and SpringerLink databases and were then analysed and illustrated with Microsoft Excel and VOSviewer software. The top keywords, articles, journals, authors , universities and countries were identified according to different parameters. The index of normalised influence was offered to evaluate the top element in each category. We observed that the most powerful keywords were present in well-known articles published in prominent journals by authoritative scientists at leading universities in the countries that are most actively engaged in MNMT. The implications of the research outcomes for investors and academicians are summarised in the conclusion.

Polymer Metallization by Ruslan Melentiev

Diamond drilling of Carbon Fiber Reinforced Polymers: Influence of tool grit size and process parameters on workpiece delamination, 2017

The physical and mechanical properties of advanced composite materials promote their application ... more The physical and mechanical properties of advanced composite materials promote their application in structural components for the aerospace and automotive sectors. However, limitations in their machinability are due to anisotropy/inhomogeneity, poor plastic deformation, and abrasive behavior. For CFRP drilling, the process efficiency is heavily influenced by cutting conditions and tool geometry. This paper reports the outcomes of experimental diamond drilling tests. A 4-mm thick carbon-epoxy composite laminate was machined. The plate was made of ten layers, in which the carbon fibers were intertwined at 90°. 6-mm diameter core drills were used. Core drills were characterized by an electroplated bond type and an AC32-H diamond grain type. Four different tool grit size ranges were tested: (1) 63/53 μm, (2) 125/106 μm, (3) 212/180 μm, and (4) 212/180 plus 63/53 μm. The results are reported in terms of workpiece delamination, thrust force, torque, and chip morphology. Overall, the results allow identifying the cutting conditions for the minimum drilling-induced delamination while retaining a satisfactory process productivity.

Effects of tool geometry and process parameters on delamination in CFRP drilling: An overview, 2016

Fiber reinforced polymers (FRPs) show advantageous physical-mechanical, thermal, and dielectric c... more Fiber reinforced polymers (FRPs) show advantageous physical-mechanical, thermal, and dielectric characteristics, making them promising candidates for weight reduction in structural applications. However, machinability is often difficult because of the specificity of their structure. This paper highlights the latest advances in CFRP drilling. Key papers are analyzed with respect to workpiece materials, geometrical tool features, and input variables (such as variation in process parameters). The influence of tool geometry and process parameters on workpiece delamination and hole quality/integrity represents the primary focus of this review. In addition, some new data are presented and discussed.

Surface texturing is an effective approach to improve the tribological performance of artificial ... more Surface texturing is an effective approach to improve the tribological performance of artificial joints. In this paper, the frictional performance of Ultra-High-Molecular-Weight-Polyethylene and Cobalt-Chromium -Molybdenum material combination with micro grooves fabricated on the metal bearings is studied. The results show that grooves with width of 500 μm, depth of 4.5 μm and pitch distance of 3 mm could provide the optimized tribological performance, the coefficient of friction of which can be down to 0.05 showing a reduction of 51.9% compared to that of polished samples without micro grooves. A two-dimensional simulation of hy-drodynamic pressure, based on Reynolds equation, is conducted. It is concluded that hydrodynamic pressure has little effect on the improved tribological performance of textured bioimplants. Otherwise, second lubrication effect induced by the polymer plastic deformation is proved to play a major role in the reduction of coefficient of friction.

Understanding the mechanism for brittle material removal via solid particle impact is important f... more Understanding the mechanism for brittle material removal via solid particle impact is important for various areas such as energy and aerospace industries. The existing analytical formulation of erosion damage, consistent with indentation fracture theory, overestimates actual erosion by over 200%. This study complements an existing analysis by prescribing a realistic shape and mechanical properties to the impinging particle. We quantitatively show that a lateral crack in glass does not nucleate at the indenter's tip or the theoretical plastic depth, but at an intermediate depth. This depth can be found by implementing the actual particle penetration depth into Hill's ratio. Several new geometries of the particle's impacting tip are proposed as ways to achieve adequate particle penetration depth instead of an expanding hemispherical cavity. The crater depth, surface roughness, and erosion efficiency of borosilicate glass are predicted with 10%, 24%, and 23% error, respectively, using a simple analytical routine.

The improved scratch resistance of epoxy-based coatings on titanium alloy is greatly needed in th... more The improved scratch resistance of epoxy-based coatings on titanium alloy is greatly needed in the current biomedical device sector. Due to commercial factors, this improvement must be either non-consumptive or inherited from the antecedent machining steps. This study contributes an extensive understanding of Ti-6Al-4 V surface topography, microstructure, chemistry and wettability generated with various processes, such as milling, polishing, hydrofluoric acid-etching and micro-blasting with different process parameters by utilizing optical and electron microscopy, energy-dispersive X-ray spectroscopy, X-Ray diffraction and surface tension. The phenolic resin is then spin-coated, cured and scratched with a conical indenter in a constant loading mode. The influence of roughness parameters, microstructural and chemical changes on wettability and delamination size, pattern and mode are analyzed. The root mean square gradient of surface slope and the developed interfacial area ratio are found to be in good correlation with the delamination factor. The delamination factor and specific traction force after micro-blasting are improved by a factor of two compared to that achieved by polishing or milling and is superior to that obtained by acid-etching. This study, therefore, clearly demonstrates the strong potential of micro-blasting as a pretreatment technique to enhance the adhesion strength and scratch-resistance of epoxy coating on titanium implants.

A R T I C L E I N F O Keywords: abrasive jet machining micro-machining surface texturing solid pa... more A R T I C L E I N F O Keywords: abrasive jet machining micro-machining surface texturing solid particle erosion artificial joints A B S T R A C T Hectares of tribological micro-texture must be machined per year to reduce friction and wear in artificial ar-ticular joints. Productive and cost-effective tribo-texturing of freeform surfaces consisting of hard-to-machine materials is a current manufacturing challenge. This study evaluates the accuracy and productivity of micro abrasive jet machining when fabricating micro-channels on metal in a mask-less way. The influence of micro abrasive jet process parameters on micro-channel's geometry and fabrication speed is in focus in this study. We blast 27-μm alumina powder through Ø0.5 mm nozzle at Co-Cr-Mo substrate under 0.1-0.8 MPa of air pressure, 30°-90°of nozzle angles and 0.5-3.5 mm of stand-off distance. Measurements show that the micro-channels can be as narrow as 110% of the nozzle diameter and have V-, U-or W-shaped bottom at the particular stand-off distance and air pressure. The fabrication speed of 550 μm × 5 μm channels (width × depth) reaches 260 mm/ min and allows to texture the femoral head of a hip joint within several minutes using a single nozzle and a few grams of abrasives. Overall, the accuracy, productivity and cost-effectiveness of micro abrasive jet machining are highly suitable for tribological surface texturing of artificial joints.

Particle shape factor Surface roughness Developed interfacial area ratio Size effect A B S T R A ... more Particle shape factor Surface roughness Developed interfacial area ratio Size effect A B S T R A C T Specific surface treatments to enhance adhesion, osseointegration and other area-related processes contribute greatly to the cost of manufacturing functional products. It is thus necessary to develop a productive and cost-efficient surface treatment technique for modifying the surface of bio-medical alloys such as Co-Cr-Mo to improve their bio-functionality. This study estimates the capabilities of the micro-blasting technique for a developed bone/implant interfacial area. Eight abrasive fractions of white aluminium oxide were comprehensively measured and blasted at a Co-Cr-Mo substrate. Then, this substrate was analysed in terms of nine roughness parameters. We found no significant variation in convexity, circularity or aspect ratio among 5-300 µm particles. The amplitude and space parameters of the eroded surface were proportional to the particles' kinetic energy, and two hybrid parameters were subject to the particle size effect. The working hypothesis is that the particle size effect on the wear rate and root mean square (RMS) gradient of the surface slope are two aspects of one phenomenon. The size effect is known in a wear issue, yet this is the first time the size effect has been reported in relation to surface morphology. Variation in the RMS gradient with variation in particle size was analytically explained by the relative bluntness theory. The developed interfacial area was proportional to the impact energy and inverse to the tip radius of the particle. Blasting of angular abrasives larger than 60 µm was capable of doubling the surface area, while blasting of abrasives larger than 300 µm produced appropriate topography for mechanical fixation at the bone/implant interface.

This study proposes a novel, cost-efficient and productive technique, Tribo-blast, to tailor surf... more This study proposes a novel, cost-efficient and productive technique, Tribo-blast, to tailor surface topography for tribological purposes. Tribo-blast is based on mask-less micro-blasting with spherical or angular particles and precisely controlled process parameters. This approach enables rapid fabrication of μ-pockets (5-50 μm) on free-form surfaces comprised of any material. A particle with a new 3D geometry-a spinning top-is proposed to match the shape and dimensions of the irregular craters formed in a metallic target by an angular particle at the normal impact angle. The results were experimentally validated on stainless steel 316L, Co-Cr-Mo and Ti-6Al-4V alloys. A simple analytical routine allowed for control over the size, area, concentration and homo-geneity of randomly distributed angular and spherical μ-pockets with <20% error. The Abbott-Firestone curve and texture ratio can be tailored according to one's intended design. The bearing index of the tailored surface was more than two times that of the lapped surface, and fluid retention was increased one hundred times. Thus, this approach is considered to be more productive, cost-effective and simple than current micro-texturing techniques.

Micro-blasting is a non-conventional subtractive micro-manufacturing technology based on erosion ... more Micro-blasting is a non-conventional subtractive micro-manufacturing technology based on erosion localisation and intensification. The thermal aspects of erosion are rarely discussed in the literature and commonly neglected in the analysis of erosion mechanism and quality control of machined surface. This study uses analytical, numerical and experimental approaches to explore erosion temperature in relation to micro-blasting of carbon steels. The research shows that, in terms of temperature, airborne erosion by solid particles is a double-natured process; the surface temperature may increase up to a few thousand degrees Celsius after a single impact, yet it dissipates at the subsurface over several microseconds. Melted and adhered drops of the metallic substrate were found in optical images of abrasive particles and SEM images of a machined surface. EDX elemental analysis confirmed that a thin metal layer was deposited on the particle's interface. Despite this, several FEM models and measurements taken by a thermocouple and IR camera-showed that the steady-state temperature is negligible. The heat generated during each impact has sufficient time to dissipate, leaving a residual temperature of a few degrees before the next impact at the same site. This heat accumulation could elevate the temperature to a few hundred degrees, particularly when the workpiece is small, although convective cooling by air flow effectively dominates this effect. In general, small and slow abrasives are recommended to reduce the temperature. Application of alumina particles smaller than 27 µm to blast low-carbon steels produces minimal negative consequences.

Micro-abrasive jet machining (AJM) is an advanced subtractive machining technology with ample opp... more Micro-abrasive jet machining (AJM) is an advanced subtractive machining technology with ample opportunities to form regular micro-patterns on freeform surfaces. AJM removes material mainly through erosion and abrasion, which transform kinetic energy to fracture and deform substrates. The kinetic energy of a solid particle is tightly connected to its velocity, which is the most significant source of error in precise prediction of a machined feature. The present study involves both theoretical analysis and two-dimensional axisymmetric numerical simulation of particle velocity fields at the lower end of the micro-scale. The developed model represents the finest particles in a cylindrical nozzle down to an inner diameter of 100 μm. The computed results agree well with the experimental data. It is shown that, due to viscous friction, such nozzles are significantly less efficient in terms of particle saturation with kinetic energy. The study highlights the effects of nozzle diameter and length, air pressure, particle size and density on particle velocity development through the jet field. Finally, practical recommendations and multiple regression models of maximum particle velocity, location from the nozzle exit and simplex velocity profile approximation are offered for management of particle kinetic energy.

Recent advances and challenges of abrasive jet machining, 2018

Abrasive jet machining (AJM) is a manufacturing technology based on erosion localization and inte... more Abrasive jet machining (AJM) is a manufacturing technology based on erosion localization and intensification. AJM has a progressively important influence on the machining technology market. Over the past 20 years, there has been an exponential growth in the number of papers that discuss AJM. Various innovations and process developments such as intermittent, submerged, thermally assisted and other jet conditions were proposed. This paper examines AJM’s technological advantages and the variety of machining operations in different industries where AJM is utilized. Particular attention is devoted to the micro-texturing capabilities of powder blasting and its application in tribology. New evidence of ductile and brittle material removal mechanisms are reviewed together with recently discovered elastic removal mode. The effects of hydraulic, abrasive and machining parameters on particles kinetic energy, machined surface roughness and footprint size are described in detail. Nozzle wear has a strong dependence on nozzle materials, its geometry, particles size, hardness, and flow rate. The trend of AJM development is a shift from macro to micro scale. Improvements in micro-machining resolution, process controlling and erosion prediction are current challenges facing AJM.

Bibliometric analysis of micro-nano manufacturing technologies-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0, 2019

Manufacturing is the primary industry promoting economic and social development. For the past 30 ... more Manufacturing is the primary industry promoting economic and social development. For the past 30 years, the global trends of preciseness and device miniaturisation have promoted manufacturing to the micro (μ) and nano (η) scale. Identification of the most promising micro-nano manufacturing technologies (MNMT) is of interest to industry, academia and private and national science investing foundations. Considering the exponential broadening of the research area and an enormous volume of literature, providing an overview of the state of the art is far beyond the scope of a technical review paper. This study performs bibliometric analysis of a stream of academic literature devoted to μ-and η-machining. The main goals of the analysis are to assess the current core and trends in the field of MNMT. Literature and citation statistics from 1988 were collected from the Web of Science , Google Scholar, Scopus, Engineering Village, ScienceDirect and SpringerLink databases and were then analysed and illustrated with Microsoft Excel and VOSviewer software. The top keywords, articles, journals, authors , universities and countries were identified according to different parameters. The index of normalised influence was offered to evaluate the top element in each category. We observed that the most powerful keywords were present in well-known articles published in prominent journals by authoritative scientists at leading universities in the countries that are most actively engaged in MNMT. The implications of the research outcomes for investors and academicians are summarised in the conclusion.