Srujan Manohar - Academia.edu (original) (raw)

Papers by Srujan Manohar

Periodica Polytechnica Mechanical Engineering

Friction stir welding (FSW) is a solid-state welding approach that can produce high quality joint... more Friction stir welding (FSW) is a solid-state welding approach that can produce high quality joints in a fast and reliable manner. The present study is focused on optimization of multi-responses for micro-friction stir welded Al6061-T6 and SS304 sheets. Weld-parameters such as tool-rotational speed (TRS) and tool-traverse speed (TTS) influenced the mechanical responses of dissimilar welded joints significantly. In order to determine the effect of optimum process parameters on mechanical responses such as ultimate-tensile strength (UTS), micro-hardness (MHV) and surface-roughness (Ra) of dissimilar welded joints, an attempt has been made to find out the best possible set of process variables through multi-attribute optimization using technique for order of preference by similarity to ideal solution (TOPSIS) approach. Finally, the optimal solution shows that multi-responses of micro-friction stir welds can be improved through TOPSIS approach.

The micro structure and mechanical properties of AISI 316L/317L austenitic stainless steels with ... more The micro structure and mechanical properties of AISI 316L/317L austenitic stainless steels with in conel 825 alloy were investigated in this work. Two types of filler materials 316L and ERNiCrMo-3 were used to obtain dissimilar weldments using TIG welding. The comparative evaluation initially studied on cutting parameters using unconventional machining process (hereby Water jet machining is considered for cutting process) and impact test is carried on all machined specimens. The impact test results for all specimens exhibits ductile fracture. A detailed micro structural observation was made on all dissimilar joints using SEM analysis. At last it was concluded that ERNiCrMo-3 filler material was the best choice for the joint AISI 317L austenitic stainless steel and Inconel 825 alloy.

Journal of Advanced Manufacturing Systems, 2021

Friction stir welding is a contact welding process that uses the heat generated by friction to fu... more Friction stir welding is a contact welding process that uses the heat generated by friction to fuse two different materials. This work is focused on the development of micro-friction stir welding which is carried out for very thin sectioned materials of thickness 1000[Formula: see text][Formula: see text]m or less. Friction welded butt-joints were successfully produced for 0.8[Formula: see text]mm thin AA6061 and SS304 sheets on a semi-automated vertical milling machine using a zero-pin length tool. A mild steel backing plate is used as fixture mechanism to hold the welding sheets on machine. Tool-rotational speed and Tool-travel speed are the weld-parameters examined on mechanical responses such as tensile behavior, micro-hardness and surface-roughness across the nugget-weld zone interface. The maximum tensile strength is obtained at lower weld-parameters. Tensile strength properties of AA6061-T6/SS304 joints were approximately found to be 25% lower than that of the AA6061-T6 alloy...

IOP Conference Series: Materials Science and Engineering, 2021

The need for more efficient design has become a main concern to work with a good range for angle ... more The need for more efficient design has become a main concern to work with a good range for angle of attack (AOA) to reduce the stall formation. In this project, two types of NACA series airfoils i.e., symmetrical and asymmetrical profiles depending on their usage in various sectors are compared. The profile of the airfoils is imported into ANSYS Fluent from the data files. The 2D geometry of the airfoils is simulated under two different wind velocitiesi.e., at 3m/s and 15m/s respectively. The graphs are plotted for comparing coefficients of lift (CL) and drag (CD)withrespect to the angle of attack(α) for symmetrical and asymmetrical airfoils. The stall formation with change of geometry and angle of attack is also observed.

Materials Today: Proceedings, 2020

Friction stir welding [FSW] is a promising technique for joining various similar and dissimilar m... more Friction stir welding [FSW] is a promising technique for joining various similar and dissimilar materials with an application of frictional heat source generated by a non-consumable rotating tool for achieving high quality welds. In this article, FSW process is focused on the development of micro-friction stir welding [lFSW], which is observed on very thin sectional materials of thickness 1000 lm [1 mm] or less. The joining of precipitation-hardened aluminium alloy to pure-copper sheets of 0.8 mm thickness each were carried out on a semi-automatic vertical milling machine using a zero-pin length tool configuration. A mild steel backing plate is designed for fixture mechanism to hold the welding sheets on machine. Weld-process parameters coded for tool-rotational speed, tool-travel speed and tool-plunge depth are examined for predicting better joint characteristics. Mechanical responses such as tensile strength, yield strength, percentage-elongation and micro-hardness are recorded for better weld joints at weld-nugget zone [WNZ] interface. Microstructural features are observed on achieved mechanical responses of welded joints using scanning electron microscope [SEM] and energy dispersive X-ray [EDX] analyzer.

International Journal of Engineering Research and, 2015

The motivation of this project is to investigate the performance parameters of R22, R410A and R40... more The motivation of this project is to investigate the performance parameters of R22, R410A and R404A refrigerants at various air outlet temperatures. The performance parameters include various thermodynamic properties like maximum discharge pressure, coefficient of performance, power consumption, heat rejection and mass flow rate. Normally for all refrigerants, thermodynamic properties decrease on achieving less temperature. As R410A is now widely used refrigerant, but on experimentation it has been observed that R404A has reached the desired temperature in short time and having highest mass flow rate when compared with R410A and R22 at four different air outlet temperatures and also there is a slight comparison observed on remaining thermodynamic properties for R410A and R404A.

IOP Conference Series: Materials Science and Engineering, 2021

This work is an attempt to identify the optimum weld-process variables for micro-friction stir we... more This work is an attempt to identify the optimum weld-process variables for micro-friction stir welding of Al6061(T6) and Cu101 sheets using multi-response optimization. The experiments were conducted according to L9 orthogonal array with selected input variables namely tool-rotational speed and tool-travel speed. The response variables considered in this study are ultimate tensile strength, micro-hardness and surface-roughness which determine the strength of the welded-joint. The multi-response optimization approach namely Technique for Order Preference by Similarity to Ideal Solution(TOPSIS) method is used to determine the optimum process variables that provides the best value among all response variables. Finally, the optimal solution shows that multi-responses of micro-friction stir welds can be improved through TOPSIS method.

International Journal of Recent Technology and Engineering (IJRTE), 2019

In this study, friction stir welding(FSW) process is carried out on heat-treated 6070aluminium al... more In this study, friction stir welding(FSW) process is carried out on heat-treated 6070aluminium alloy plates of 10mm thickness in two stages using two different tool materials. Firstly, annealed 6070aluminium alloy(O-temper condition) is joined with naturally aged 6070aluminium alloy(T4-temper condition) using H13(Tool steel) material and HCHCR-D2(Die steel) material. Similarly, annealed 6070aluminium alloy(O-temper condition) is joined with artificially aged 6070aluminium alloy(T6-temper condition) using the same tool materials. Both the stages are welded for two rotational speeds and two welding speeds using cylindrically threaded H13 and HCHCR tools. The effect of these welding parameters are further investigated on tensile behaviour(ultimate tensile strength, yield strength and percentage-elongation) and hardness for each welded stage to identify better weld-joint strength. Finally micro-structural examinations are carried out on better tensile responses using scanning electron m...

Periodica Polytechnica Mechanical Engineering

Friction stir welding (FSW) is a solid-state welding approach that can produce high quality joint... more Friction stir welding (FSW) is a solid-state welding approach that can produce high quality joints in a fast and reliable manner. The present study is focused on optimization of multi-responses for micro-friction stir welded Al6061-T6 and SS304 sheets. Weld-parameters such as tool-rotational speed (TRS) and tool-traverse speed (TTS) influenced the mechanical responses of dissimilar welded joints significantly. In order to determine the effect of optimum process parameters on mechanical responses such as ultimate-tensile strength (UTS), micro-hardness (MHV) and surface-roughness (Ra) of dissimilar welded joints, an attempt has been made to find out the best possible set of process variables through multi-attribute optimization using technique for order of preference by similarity to ideal solution (TOPSIS) approach. Finally, the optimal solution shows that multi-responses of micro-friction stir welds can be improved through TOPSIS approach.

The micro structure and mechanical properties of AISI 316L/317L austenitic stainless steels with ... more The micro structure and mechanical properties of AISI 316L/317L austenitic stainless steels with in conel 825 alloy were investigated in this work. Two types of filler materials 316L and ERNiCrMo-3 were used to obtain dissimilar weldments using TIG welding. The comparative evaluation initially studied on cutting parameters using unconventional machining process (hereby Water jet machining is considered for cutting process) and impact test is carried on all machined specimens. The impact test results for all specimens exhibits ductile fracture. A detailed micro structural observation was made on all dissimilar joints using SEM analysis. At last it was concluded that ERNiCrMo-3 filler material was the best choice for the joint AISI 317L austenitic stainless steel and Inconel 825 alloy.

Journal of Advanced Manufacturing Systems, 2021

Friction stir welding is a contact welding process that uses the heat generated by friction to fu... more Friction stir welding is a contact welding process that uses the heat generated by friction to fuse two different materials. This work is focused on the development of micro-friction stir welding which is carried out for very thin sectioned materials of thickness 1000[Formula: see text][Formula: see text]m or less. Friction welded butt-joints were successfully produced for 0.8[Formula: see text]mm thin AA6061 and SS304 sheets on a semi-automated vertical milling machine using a zero-pin length tool. A mild steel backing plate is used as fixture mechanism to hold the welding sheets on machine. Tool-rotational speed and Tool-travel speed are the weld-parameters examined on mechanical responses such as tensile behavior, micro-hardness and surface-roughness across the nugget-weld zone interface. The maximum tensile strength is obtained at lower weld-parameters. Tensile strength properties of AA6061-T6/SS304 joints were approximately found to be 25% lower than that of the AA6061-T6 alloy...

IOP Conference Series: Materials Science and Engineering, 2021

The need for more efficient design has become a main concern to work with a good range for angle ... more The need for more efficient design has become a main concern to work with a good range for angle of attack (AOA) to reduce the stall formation. In this project, two types of NACA series airfoils i.e., symmetrical and asymmetrical profiles depending on their usage in various sectors are compared. The profile of the airfoils is imported into ANSYS Fluent from the data files. The 2D geometry of the airfoils is simulated under two different wind velocitiesi.e., at 3m/s and 15m/s respectively. The graphs are plotted for comparing coefficients of lift (CL) and drag (CD)withrespect to the angle of attack(α) for symmetrical and asymmetrical airfoils. The stall formation with change of geometry and angle of attack is also observed.

Materials Today: Proceedings, 2020

Friction stir welding [FSW] is a promising technique for joining various similar and dissimilar m... more Friction stir welding [FSW] is a promising technique for joining various similar and dissimilar materials with an application of frictional heat source generated by a non-consumable rotating tool for achieving high quality welds. In this article, FSW process is focused on the development of micro-friction stir welding [lFSW], which is observed on very thin sectional materials of thickness 1000 lm [1 mm] or less. The joining of precipitation-hardened aluminium alloy to pure-copper sheets of 0.8 mm thickness each were carried out on a semi-automatic vertical milling machine using a zero-pin length tool configuration. A mild steel backing plate is designed for fixture mechanism to hold the welding sheets on machine. Weld-process parameters coded for tool-rotational speed, tool-travel speed and tool-plunge depth are examined for predicting better joint characteristics. Mechanical responses such as tensile strength, yield strength, percentage-elongation and micro-hardness are recorded for better weld joints at weld-nugget zone [WNZ] interface. Microstructural features are observed on achieved mechanical responses of welded joints using scanning electron microscope [SEM] and energy dispersive X-ray [EDX] analyzer.

International Journal of Engineering Research and, 2015

The motivation of this project is to investigate the performance parameters of R22, R410A and R40... more The motivation of this project is to investigate the performance parameters of R22, R410A and R404A refrigerants at various air outlet temperatures. The performance parameters include various thermodynamic properties like maximum discharge pressure, coefficient of performance, power consumption, heat rejection and mass flow rate. Normally for all refrigerants, thermodynamic properties decrease on achieving less temperature. As R410A is now widely used refrigerant, but on experimentation it has been observed that R404A has reached the desired temperature in short time and having highest mass flow rate when compared with R410A and R22 at four different air outlet temperatures and also there is a slight comparison observed on remaining thermodynamic properties for R410A and R404A.

IOP Conference Series: Materials Science and Engineering, 2021

This work is an attempt to identify the optimum weld-process variables for micro-friction stir we... more This work is an attempt to identify the optimum weld-process variables for micro-friction stir welding of Al6061(T6) and Cu101 sheets using multi-response optimization. The experiments were conducted according to L9 orthogonal array with selected input variables namely tool-rotational speed and tool-travel speed. The response variables considered in this study are ultimate tensile strength, micro-hardness and surface-roughness which determine the strength of the welded-joint. The multi-response optimization approach namely Technique for Order Preference by Similarity to Ideal Solution(TOPSIS) method is used to determine the optimum process variables that provides the best value among all response variables. Finally, the optimal solution shows that multi-responses of micro-friction stir welds can be improved through TOPSIS method.

International Journal of Recent Technology and Engineering (IJRTE), 2019

In this study, friction stir welding(FSW) process is carried out on heat-treated 6070aluminium al... more In this study, friction stir welding(FSW) process is carried out on heat-treated 6070aluminium alloy plates of 10mm thickness in two stages using two different tool materials. Firstly, annealed 6070aluminium alloy(O-temper condition) is joined with naturally aged 6070aluminium alloy(T4-temper condition) using H13(Tool steel) material and HCHCR-D2(Die steel) material. Similarly, annealed 6070aluminium alloy(O-temper condition) is joined with artificially aged 6070aluminium alloy(T6-temper condition) using the same tool materials. Both the stages are welded for two rotational speeds and two welding speeds using cylindrically threaded H13 and HCHCR tools. The effect of these welding parameters are further investigated on tensile behaviour(ultimate tensile strength, yield strength and percentage-elongation) and hardness for each welded stage to identify better weld-joint strength. Finally micro-structural examinations are carried out on better tensile responses using scanning electron m...