Anurag Hamilton - Academia.edu (original) (raw)
Uploads
Papers by Anurag Hamilton
Advances in Materials and Processing Technologies
Journal of Polymer & Composites, Aug 27, 2021
Design Engineering, May 3, 2021
Increasing internal combustion propelled vehicles in urban and rural areas has given rise to many... more Increasing internal combustion propelled vehicles in urban and rural areas has given rise to many adverse effects such as emissions of harmful pollutants like hydrocarbons, nitrogen oxides, carbon monoxide and particulate matter which directly or indirectly affects human health. A busy lifestyle and less exercise can lead to physical problems. To reduce use of fossil fuel and health related problems Human powered vehicles are one of the practical possibilities for sustainable transport systems. The vehicle which is driven by human power i.e. muscular power will provide an immediate solution to fuel limitations and pollution caused by conventional fuel propelled vehicles. Although much research has been done on electric bicycles, more research is needed on speed, power sources, batteries, charging methods, bicycling facilities/infrastructures, rider comfort, and safety. This paper focuses on the improvements needed in the field of electric bicycles such as energy sources, Electric mo...
Burnishing is a well-known cold working technique for improving the surface integrity. It is a ve... more Burnishing is a well-known cold working technique for improving the surface integrity. It is a very cost-effective and efficient approach for improving surface finish and hardness. Use of burnishing to replace current heat treatment and grinding processes on reamer shank is offered as a unique strategy for reamer shank processing. This change in processing reduces cycle time and resources while also conserves energy required for processing during heat treatment and grinding. In this work Taguchi optimization technique is used to determine the optimum parameter values of burnishing process to attain required surface finish and hardness to fulfil all functional requirements of shank. Test outcomes are convincing which shows that suggested process has capability to replace current heat treatment and grinding process, thus conserves energy.
Surface Topography: Metrology and Properties, 2022
Surface finish plays important role in service characteristics of an element, such as corrosion r... more Surface finish plays important role in service characteristics of an element, such as corrosion resistance, wear resistance and fatigue life. This leads to investigate surface finishing processes like polishing, buffing, lapping, burnishing etc. Burnishing is well known, effective and efficient super finishing technique which involves surface layers plastic deformation by cold working to refine surface texture and improve service life of component. Current work focuses on investigation of ball burnishing process and optimization of it on EN31 steel. Taguchi method is implemented for determination of best possible process parameters combination to decrease surface roughness and increase hardness of EN31 steel specimens. After burnishing surface roughness decreases from 0.446 to 0.089 μm and hardness increases from 179.5 to 266.5 Hv. Burnishing speed and feed are remarkable factors for decreasing surface roughness, whereas no. of tool passes and applied force are crucial for increasin...
Materials Today: Proceedings, 2018
In the present investigation, solid particle erosion behaviour of CA6NM steel was evaluated using... more In the present investigation, solid particle erosion behaviour of CA6NM steel was evaluated using air jet erosion tester at two different impingement velocities (35 and 70 m/s) and at three different impingement angles (30°, 60° and 90°). Alumina was used as erodent for performing the test. It was observed that higher cumulative volume loss is observed in case of 70 m/s impingement velocity in comparison to 35 m/s impingement velocity. This is mainly attributed to higher kinetic energy of impacting particle. Highest cumulative volume loss is observed at 30° impingement angle which point to fact that material has eroded in ductile manner. Eroded surface of steel was analyzed using FESEM to study the erosion mechanism. Formation of lips, lips and crater and crater are observed at 30°, 60° and 90° impingement angles respectively.
Surface Review and Letters, 2017
In the present investigation, WC-10Co-4Cr coating was deposited by high velocity air-fuel (HVAF) ... more In the present investigation, WC-10Co-4Cr coating was deposited by high velocity air-fuel (HVAF) process on CA6NM hydro turbine steel. A detailed microstructural and phase compositional study was carried out on the coating. Mechanical properties of the coating were also evaluated. WC-10Co-4Cr coating showed a homogeneous, well-bonded structure with low porosity, which is mainly attributed to less decarburization of WC. Erosion resistance of the coating was evaluated by air jet erosion tester at three different impingement angles (30[Formula: see text], 60[Formula: see text] and 90[Formula: see text]) for 35 and 70[Formula: see text]m/s impact velocities. The FESEM micrographs were taken, before and after erosion tests, to determine the erosion mechanism. The test results revealed that the coating protects the substrate at 30[Formula: see text], 60[Formula: see text] and 90[Formula: see text] impingement angles. At 70[Formula: see text]m/s impact velocity, uncoated and coated steel s...
Key Engineering Materials, 2017
In the present investigation, WC–10Co–4Cr coating was deposited by high velocity oxy-fuel (HVOF) ... more In the present investigation, WC–10Co–4Cr coating was deposited by high velocity oxy-fuel (HVOF) process on CA6NM hydro turbine steel to improve its erosion resistance. The coating was characterized in term of crossectional microstructure, phase, microhardness and fracture toughness using a field emission scanning electron microscope (FESEM), X-ray diffractometer and microhardness tester respectively. Solid particle erosion resistance of the substrate and coating were evaluated by air jet erosion tester at two different impingement angles (30° and 90°). Coating microstructure has shown a homogeneous and well-bonded laminar morphology. The microhardness of the coating was observed more than three times higher than CA6NM substrate. This resulted in significant improvement in erosion resistance of coated CA6NM steel at both impingement angles.
Journal of Iron and Steel Research International, 2011
Grade A (GA) and high strength steel DH36 ship steels possessing different chemical compositions ... more Grade A (GA) and high strength steel DH36 ship steels possessing different chemical compositions were used, and strength properties of GA steel and DH36 steel were compared. Additionally, 4 types of dual phase (DP) steels with different martensite volume fractions (MVFs) were produced from GA steel by means of heat treatment and they were compared with other steels through conducting microstructure, microhardness, tensile and impact tests. The fracture surfaces of specimens (DH36, GA and DP steels) exposed to tensile and Charpy impact tests were investigated by scanning electron microscope. Furthermore, it was found that the specimens quenched from 800 and 900 C had better strength than DH36 steel. The tensile test results indicated that the tensile strength of DP steel water quenched from 900 C was 3 times that of GA steel and twice that of DH36 steel.
Active air conditioning system consume a significant amount of electricity for cooling applicatio... more Active air conditioning system consume a significant amount of electricity for cooling application, therefore it is necessary to investigate low-energy consuming cooling systems such as evaporative cooling. The objective of this paper is to give an overview of evaporative cooling as well as a design for an in-direct type evaporation cooling system. This paper describes an evaporation type passive cooling system and uses Evapcal software to design an in-direct type evaporation passive cooling system. A hospital building in Karnataka's eastern region was studied as a case study. It was observed that the in-direct type evaporation cooler system's air output temperature and relative humidity will be 25.4 0C and 53% respectively. During summer season, indirect evaporative cooling system provides comfort condition for 60% of operational hours.
Advances in Materials and Processing Technologies
Journal of Polymer & Composites, Aug 27, 2021
Design Engineering, May 3, 2021
Increasing internal combustion propelled vehicles in urban and rural areas has given rise to many... more Increasing internal combustion propelled vehicles in urban and rural areas has given rise to many adverse effects such as emissions of harmful pollutants like hydrocarbons, nitrogen oxides, carbon monoxide and particulate matter which directly or indirectly affects human health. A busy lifestyle and less exercise can lead to physical problems. To reduce use of fossil fuel and health related problems Human powered vehicles are one of the practical possibilities for sustainable transport systems. The vehicle which is driven by human power i.e. muscular power will provide an immediate solution to fuel limitations and pollution caused by conventional fuel propelled vehicles. Although much research has been done on electric bicycles, more research is needed on speed, power sources, batteries, charging methods, bicycling facilities/infrastructures, rider comfort, and safety. This paper focuses on the improvements needed in the field of electric bicycles such as energy sources, Electric mo...
Burnishing is a well-known cold working technique for improving the surface integrity. It is a ve... more Burnishing is a well-known cold working technique for improving the surface integrity. It is a very cost-effective and efficient approach for improving surface finish and hardness. Use of burnishing to replace current heat treatment and grinding processes on reamer shank is offered as a unique strategy for reamer shank processing. This change in processing reduces cycle time and resources while also conserves energy required for processing during heat treatment and grinding. In this work Taguchi optimization technique is used to determine the optimum parameter values of burnishing process to attain required surface finish and hardness to fulfil all functional requirements of shank. Test outcomes are convincing which shows that suggested process has capability to replace current heat treatment and grinding process, thus conserves energy.
Surface Topography: Metrology and Properties, 2022
Surface finish plays important role in service characteristics of an element, such as corrosion r... more Surface finish plays important role in service characteristics of an element, such as corrosion resistance, wear resistance and fatigue life. This leads to investigate surface finishing processes like polishing, buffing, lapping, burnishing etc. Burnishing is well known, effective and efficient super finishing technique which involves surface layers plastic deformation by cold working to refine surface texture and improve service life of component. Current work focuses on investigation of ball burnishing process and optimization of it on EN31 steel. Taguchi method is implemented for determination of best possible process parameters combination to decrease surface roughness and increase hardness of EN31 steel specimens. After burnishing surface roughness decreases from 0.446 to 0.089 μm and hardness increases from 179.5 to 266.5 Hv. Burnishing speed and feed are remarkable factors for decreasing surface roughness, whereas no. of tool passes and applied force are crucial for increasin...
Materials Today: Proceedings, 2018
In the present investigation, solid particle erosion behaviour of CA6NM steel was evaluated using... more In the present investigation, solid particle erosion behaviour of CA6NM steel was evaluated using air jet erosion tester at two different impingement velocities (35 and 70 m/s) and at three different impingement angles (30°, 60° and 90°). Alumina was used as erodent for performing the test. It was observed that higher cumulative volume loss is observed in case of 70 m/s impingement velocity in comparison to 35 m/s impingement velocity. This is mainly attributed to higher kinetic energy of impacting particle. Highest cumulative volume loss is observed at 30° impingement angle which point to fact that material has eroded in ductile manner. Eroded surface of steel was analyzed using FESEM to study the erosion mechanism. Formation of lips, lips and crater and crater are observed at 30°, 60° and 90° impingement angles respectively.
Surface Review and Letters, 2017
In the present investigation, WC-10Co-4Cr coating was deposited by high velocity air-fuel (HVAF) ... more In the present investigation, WC-10Co-4Cr coating was deposited by high velocity air-fuel (HVAF) process on CA6NM hydro turbine steel. A detailed microstructural and phase compositional study was carried out on the coating. Mechanical properties of the coating were also evaluated. WC-10Co-4Cr coating showed a homogeneous, well-bonded structure with low porosity, which is mainly attributed to less decarburization of WC. Erosion resistance of the coating was evaluated by air jet erosion tester at three different impingement angles (30[Formula: see text], 60[Formula: see text] and 90[Formula: see text]) for 35 and 70[Formula: see text]m/s impact velocities. The FESEM micrographs were taken, before and after erosion tests, to determine the erosion mechanism. The test results revealed that the coating protects the substrate at 30[Formula: see text], 60[Formula: see text] and 90[Formula: see text] impingement angles. At 70[Formula: see text]m/s impact velocity, uncoated and coated steel s...
Key Engineering Materials, 2017
In the present investigation, WC–10Co–4Cr coating was deposited by high velocity oxy-fuel (HVOF) ... more In the present investigation, WC–10Co–4Cr coating was deposited by high velocity oxy-fuel (HVOF) process on CA6NM hydro turbine steel to improve its erosion resistance. The coating was characterized in term of crossectional microstructure, phase, microhardness and fracture toughness using a field emission scanning electron microscope (FESEM), X-ray diffractometer and microhardness tester respectively. Solid particle erosion resistance of the substrate and coating were evaluated by air jet erosion tester at two different impingement angles (30° and 90°). Coating microstructure has shown a homogeneous and well-bonded laminar morphology. The microhardness of the coating was observed more than three times higher than CA6NM substrate. This resulted in significant improvement in erosion resistance of coated CA6NM steel at both impingement angles.
Journal of Iron and Steel Research International, 2011
Grade A (GA) and high strength steel DH36 ship steels possessing different chemical compositions ... more Grade A (GA) and high strength steel DH36 ship steels possessing different chemical compositions were used, and strength properties of GA steel and DH36 steel were compared. Additionally, 4 types of dual phase (DP) steels with different martensite volume fractions (MVFs) were produced from GA steel by means of heat treatment and they were compared with other steels through conducting microstructure, microhardness, tensile and impact tests. The fracture surfaces of specimens (DH36, GA and DP steels) exposed to tensile and Charpy impact tests were investigated by scanning electron microscope. Furthermore, it was found that the specimens quenched from 800 and 900 C had better strength than DH36 steel. The tensile test results indicated that the tensile strength of DP steel water quenched from 900 C was 3 times that of GA steel and twice that of DH36 steel.
Active air conditioning system consume a significant amount of electricity for cooling applicatio... more Active air conditioning system consume a significant amount of electricity for cooling application, therefore it is necessary to investigate low-energy consuming cooling systems such as evaporative cooling. The objective of this paper is to give an overview of evaporative cooling as well as a design for an in-direct type evaporation cooling system. This paper describes an evaporation type passive cooling system and uses Evapcal software to design an in-direct type evaporation passive cooling system. A hospital building in Karnataka's eastern region was studied as a case study. It was observed that the in-direct type evaporation cooler system's air output temperature and relative humidity will be 25.4 0C and 53% respectively. During summer season, indirect evaporative cooling system provides comfort condition for 60% of operational hours.