Dr. Satuluri Srikiran | Andhra University College Of Engineering (original) (raw)

Papers by Dr. Satuluri Srikiran

Technological advancements in the development of cutting tools and coolant/lubricant chemistry ha... more Technological advancements in the development of cutting tools and coolant/lubricant chemistry have enhanced the machining capabilities of hard materials under higher machining conditions. Generation of high temperatures at the cutting zone during machining is one of the most important and pertinent problems which adversely affect the tool life and surface finish of the machined components. Generally, cutting fluids and solid lubricants are used to overcome the problem of heat generation, which is not effectively addressing the problems. With technological advancements in the field of tribology, nano-level particulate solid lubricants are being used nowadays in machining operations, especially in the areas of turning and grinding. The present investigation analyses the effect of using nano-particulate graphite powder as lubricant in the turning of AISI 1040 steel under variable machining conditions and to study its effect on cutting forces, tool temperature and surface roughness of ...

Journal of Mechanical Science and Technology, 2015

Turning, which is a widely employed method of metal removal process in manufacturing industries, ... more Turning, which is a widely employed method of metal removal process in manufacturing industries, generates many temperatures because of the increase in cutting forces. In view of the high temperatures developed in the process, tools deteriorate, and so good surface quality is difficult to achieve. Lubrication becomes critical to minimize the forces and temperatures generated during the process. In the present work, boric acid powder is used as a solid lubricant, which is mixed with vegetable oils such as coconut oil and soybean oil in turning process. The results indicate that there is a considerable improvement in the machining performance with boric acid assisted MQL in machining compared with dry and wet machining. Taguchi method is a powerful problem solving technique for improving process performance, yield, and productivity. Combining the speed, feed, and depth of cut is helpful. In the present study, the combination using Taguchi DOE was taken as factors, levels, and 32 experimental layouts are framed. The current study attempts to study the variations in tool temperature; cutting forces and surface roughness of the machined component under various machining conditions to find the optimum weight percentage of the solid lubricant used.

Volume 3: Design and Manufacturing, Parts A and B, 2010

In order to improve the performance of the cutting tool, it is required to model the metal cuttin... more In order to improve the performance of the cutting tool, it is required to model the metal cutting process at the system level. To predict and enhance the cutting tool performance the primary requirement of the system is the efficiency of the model explaining the interactions at the tool chip interface. The predominating parameters which influence the development of the system are work piece material and machining variables or sometimes both. Further the development of low cost methodology to study the chip tool interactions with minimum amount of testing is of more importance. Major part of the work is emphasized on the investigation and characterization of various zones on the rake face of tungsten carbide inserts. Tests have been carried out by machining AISI 1040 steel using WC inserts with variable dry conditions examining the chip flow phenomenon on the rake face of considerable number of samples. Taguchi method is adopted for the design of experimental conditions. Results hav...

Procedia Materials Science, 2014

Wave springs are precise flat wire compression springs that fit into assemblies that other spring... more Wave springs are precise flat wire compression springs that fit into assemblies that other springs cannot since the overall lengths and operating heights of Wave springs are lower than those of conventional round Wire springs, they will often reduce the size of an assembly by as much as 50%. Of course, this will also reduce the part weight and raw material cost of every spring produced. Wave springs operate as load bearing devices. They take up play and compensate for dimensional variations within assemblies. A virtually unlimited range of forces can be produced whereby loads build either gradually or abruptly to reach a predetermined working height. This establishes a precise spring rate in which load is proportional to deflection. Functional requirements are necessary for both dynamic and static spring applications. Special performance characteristics are individually built into each spring to satisfy a variety of precise operating conditions. Typically, a wave spring will occupy an externally small area for the amount of work it performs. The use of this product is demanded, but not limited to tight axial and radial space constraints. In this paper, a three dimensional finite element (FE) model for shock absorber spring is proposed. The present work deals the structural analysis for modelling the structural behaviour of wave springs. The design of spring in suspension system is very important. In this work a wave type of spring is designed and a 3D model is created using Pro/Engineer. The model is also changed by changing the length of the spring. Structural analysis has been conducted on the wave spring by varying the spring material such as Structural steel and Beryllium Copper. For this analysis, loads are considered as bike weight, single person and two persons. Structural analysis is done to validate the strength. The present study makes an attempt to compare the results for selecting best material for springs.

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2013

The past few decades have witnessed significant advancements in turning processes, cutting tools ... more The past few decades have witnessed significant advancements in turning processes, cutting tools and coolant/lubricant chemistry. These developments have enhanced the machining capabilities of hard materials when machining at higher cutting conditions. Turning, being characterized by the development of high temperatures at the cutting zone, is critical with respect to the tool life and surface finish apart from other machining results like the forces generated. This phenomenon of heat generation at the cutting zone plays a negative role during turning operations due to their peculiar characteristics such as poor thermal conductivity, high strength at elevated temperature, resistance to wear and chemical degradation. Cutting fluids and solid lubricants are generally used to overcome the problem of heat generation at the cutting zone. The use of cutting fluids in the conventional way may not effectively control the heat generated in turning operation. Moreover, cutting fluids are a ma...

The book aims to study the effect of solid lubricant assisted machining, using nano-crystalline g... more The book aims to study the effect of solid lubricant assisted machining, using nano-crystalline graphite as lubricant and with SAE 40 oil as a carrying medium. Among the various solid lubricants present in the market, graphite is selected for experimentation due to its inherent properties of lamellar structures and which is a high temperature solid lubricant. The carrying medium SAE 40 oil is used based on the literature report stating the benefits of using mineral oils. Majority of the lubricants used are mineral oils as per the literature available. Due to the lower kinematic of SAE 40 oil, its high flowability characteristics and its availability in the open market, SAE 40 oil is selected. The work piece considered for the purpose is AISI 1040 steel, which is an unalloyed plain carbon steel. It is selected based on the machinability rating. Moreover, a lot of literature is available which shows the use of AISI 1040 steel by applying graphite as lubricant in turning operations. Ex...

Recent Advances in Material Sciences, 2019

Experiments had been accomplished on natural convection heat transfer from circular pin fin heat ... more Experiments had been accomplished on natural convection heat transfer from circular pin fin heat sinks subjected to the effect of its geometry, heat flux and orientation. Pin fin or spines cooling configurations have long been of interest within the vicinity of cooling of turbines, automobile engines and different devices because of their doubtlessly excessive heat transfer characteristics and excessive surface area density, in addition to their structural benefits. The pin fins or spines function as tabulators to provide excessive heat transfer rate; however, their geometric association has to be optimized to avoid excessive friction loss. Experimental checks had been carried out to investigate the consequences heat transfer rate and overall heat transfer rate for sideward orientation and upward orientation of heat sink with circular pin fin array and conical spine array.

In nanocomposite materials’ research, the development of polymer nanocomposites is quickly emergi... more In nanocomposite materials’ research, the development of polymer nanocomposites is quickly emerging as a multidisciplinary research field that could broaden the applications of polymers to many different smart materials. The nanobanana fiber powders are characterized by high aspect ratios. Polymer matrices are related to thermoplastics and thermosets that have been reinforced with small amounts of nano-sized powders. Thermal analysis is a useful tool for a wide variety of properties of polymers, and it can be also applied to polymer nanocomposite in order to gain further understanding of their structure. This review illustrates the able to do many different understanding applications of thermal analysis methods in the newly visible field of polymer nanomaterial research, presenting the applications of differential scanning calorimetry (DSC), for the description of nanocomposite materials.

A novel hybrid bio-composite is developed using bio-degradable Jute nanofibers reinforced in epox... more A novel hybrid bio-composite is developed using bio-degradable Jute nanofibers reinforced in epoxy matrix. Synthesis of the jute fibers was carried out using a high energy ball mill. The nanofibers used were of particle sizes ranging from 10-30nm. The nano composites were processed using different weight percentages 0-5 wt. % of jute nanofibers reinforced with epoxy polymer matrix by hand lay-up technique. The mechanical and thermal properties of virgin (base) composite and nanocomposites (1-5wt.%) were compared using Dynamic Mechanical Analysis (DMA), Thermo gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC), DMA results revealed that the storage modulus and loss modulus of these nano composites was improved, where as the mechanical loss factor (tan delta) decreased. The nanocomposites were subjected to the heating cycle between 30oC-600oC to obtain their thermal behavior and TGA measured test were conducted in the temperature range of 30oC- 300oC to identify th...

Materials Today: Proceedings

Abstract An accurate machining process is done when the heat generated due to the large friction ... more Abstract An accurate machining process is done when the heat generated due to the large friction between the tool and workpiece is controlled. Turing has utmost importance in metal removal process. Elevated temperatures are recorded in turning process which intern effects the tool life and surface finishing of the part, proper lubrication may improves the tool life and surface finishing. Much advancement has been made in the machining aspects with regards to the lubricants used. Vegetable oils are showing better results when compared to petroleum based oils in controlling the heat generated in machining process. Nano crystalline powders can improve the properties of the base coolant. Minimum quantity lubrication (MQL) is an effective tool for avoiding flood supply. The present investigation deals with the use of a mixture of nano crystalline Graphite and Sunflower oil as a lubricant and as an alternative to the cutting fluids to reduce friction and thereby improve the surface finish of the final product. The experimental study is carried out on influence of different particle sizes of graphite nano powder on machining parameter.

Materials Today: Proceedings

Abstract Temperature variation at a cutting zone during machining drastically affects the surface... more Abstract Temperature variation at a cutting zone during machining drastically affects the surface roughness and the life of a tool. Nano crystalline powders, in the recent past has played a very important role in altering the properties of a lubricant like surface finish, cutting temperature, machining ability in order to achieve optimum results. This work is mainly concentrated on the study of lubricants when mixed with MoS 2 nanoparticles. The role of MoS 2 nanoparticles in the lubricant at different weight concentrations are analysed for different particle sizes. The input parameters such as feed, speed, depth of cut and also the size of the particle are varied during the course of experimentation. Here, the minimum quantity lubrication is taken as 10ml/min. Full Factorial design of experimentation is used to determine the optimum machining parameters using MINI TAB software. This work involves the use of nanoparticles as a lubricant whose performance is judged in terms of tool temperature and surface finish of the workpiece.

Defence Technology

Abstract The use of asbestos material is being avoided to manufacture the brake pads as it is har... more Abstract The use of asbestos material is being avoided to manufacture the brake pads as it is harmful and toxic in nature. Further it leads to various health issues like asbestosis, mesothelioma and lung cancers. These brake pads can be replaced by natural fibers like Palm kernel (0–50%), Nile roses (0–15%) and Wheat (0–10%) with additives like aluminum oxide (5%–20%) and graphite powder (10%–35%). Phenolic resin of 35% is utilized as a binder. Particulated Nile roses are used to increase the friction coefficient and wheat powder is used to reduce the wear rate. Aluminum oxide and graphite are abrasive in nature. This helps to make brake pads with high friction co-efficient and less wear rate with low noise pollution. The wear of the proposed composites have been investigated at different speeds. Various tests like wear on pin-on-disc apparatus, hardness on the Rockwell hardness apparatus and oil absorption test have been conducted. Phenolic resin produces good bonding nature to fiber. Thus, Fibers found to have performed palatably among all commercial brake pads. The objective of the research indicates that Palm kernal shell could be a conceivable alternative for asbestos in friction coating materials.

Advanced Materials Research, 2014

The generation of heat during machining at the cutting zone adversely affects the surface finish ... more The generation of heat during machining at the cutting zone adversely affects the surface finish and tool life. The heat at the cutting zone, which plays a negative role due to poor thermal conductivity, resistance to wear, high strength at high temperatures and chemical degradation can be overcome by the use of proper lubrication. Advancements in the field of tribology have led to the use of solid lubricants replacing the conventional flood coolants. This work involves the use of nanoparticulate graphite powder as a lubricant in turning operations whose performance is judged in terms of cutting forces, tool temperature and surface finish of the work piece. The experimentation revealed the increase in cutting forces and the tool temperature when the solid lubricant used is decreased in particle size. The surface finish deteriorated with the decrease in particle size of the lubricant in the nanoregime. Keywords-Turning, Solid lubricant, Graphite, Minimum Quantity Lubrication, nano–pa...

Material selection is one of the major points that should be taken into account seriously in the ... more Material selection is one of the major points that should be taken into account seriously in the engineering design stage. Each material has various properties such as mechanical, thermal, electrical, physical, environmental, optical and biological properties. It is expected that an information source such as the proposed database will provide all the necessary facts and figures to aid both designers and manufacturing engineers. In the scope of this Paper, the aim was to develop a database and a software package for material selection to help the design engineer in his decision making process. The database developed by using Microsoft Visual Studio and also contains different materials standards and can be updated if the user wants. Done the analysis for different components and results should be storage in Database by using visual studio. All features can be used as part of a sequential screening process, guiding the user to an eventual metal shortlist or selection.

Steel disc specimens under different conditions. Later, linear Regression models are developed us... more Steel disc specimens under different conditions. Later, linear Regression models are developed using input and output variables for both GCI Pin on GCI disc and PTFE filled with Graphite Pin on AISI 1040 Steel disc. Validation of the proposed mathematical equation wa s done by comparing experimental and predicted values of the experimentation and in all cases percentage error was found in between 0-6%. ANOVA was also performed on the experimental results to assess the conformity of the suggested mathematical model with 99% confidence levels.

Temperature variation at a cutting zone during machining drastically affects the surface roughnes... more Temperature variation at a cutting zone during machining drastically affects the surface roughness and the life of a tool. Nano crystalline powders, in the recent past has played a very important role in altering the properties of a lubricant like surface finish, cutting temperature, machining ability in order to achieve optimum results. This work is mainly concentrated on the study of lubricants when mixed with MoS 2 nanoparticles. The role of MoS 2 nanoparticles in the lubricant at different weight concentrations are analysed for different particle sizes. The input parameters such as feed, speed, depth of cut and also the size of the particle are varied during the course of experimentation. Here, the minimum quantity lubrication is taken as 10ml/min. Full Factorial design of experimentation is used to determine the optimum machining parameters using MINI TAB software. This work involves the use of nanoparticles as a lubricant whose performance is judged in terms of tool temperature and surface finish of the workpiece.

Journal of Mechanical Science and Technology, 2015

Volume 3: Design and Manufacturing, Parts A and B, 2010

Procedia Materials Science, 2014

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2013

Recent Advances in Material Sciences, 2019

Materials Today: Proceedings

Defence Technology

Advanced Materials Research, 2014