Effect of tool plunge depth on particles distribution via friction stir process.
Authors- Manu srivastava, Sandeep Rathee, Sachin Maheshwari, Arshad Noor Siddiquee
Journal- Defence Technology
Publisher-Elsevier
Description- Aluminium matrix surface composites are gaining alluring role especially in aerospace, defence, and marine industries. Friction stir processing (FSP) is a promising novel solid state technique for surface composites fabrication. In this study, AA6061/SiC surface composites were fabricated and the effect of tool plunge depth on pattern of reinforcement particles dispersion in metal matrix was investigated. Six varying tool plunge depths were chosen at constant levels of shoulder diameter and tool tilt angle to observe the exclusive effect of plunge variation. Process parameters chosen for the experimentation are speed of rotation, travel speed and tool tilt angle which were taken as 1400 rpm, 40 mm/min, and 2.5°respectively. Macro and the microstructural study were performed using stereo zoom and optical microscope respectively. Results reflected that lower plunge depth levels lead to insufficient heat generation
Multi-response optimization of fused deposition modelling.
Authors- Manu Srivastava, Sachin Maheshwari, TK Kundra, Sandeep Rathee
Journal- Materials Today: Proceedings
Publisher- Elsevier
Description-The basic efforts of this investigation are focused on the development of an optimal layout plan with minimal build time, model material volume, support volume and thus production cost for a Fortus 250mc modeler. ABS plastic is used as a raw material and cylindrical primitives with pre specified STL dimensions are taken as the component. This study focuses on multi response optimization of layout plan for different FDM parameters as well as spatial orientations. Experiments are conducted using full factorial central composite design. Response surface methodology based desirability analysis was employed for optimization of FDM process parameters namely, contour width, raster width, air gap, raster angle, slice height and orientation based on multiple performance characteristics including build time, model material volume and support material volume.
Investigating effects of groove dimensions on microstructure and mechanical properties of AA6063/SiC.
Authors- Sandeep Rathee, Sachin Maheshwari, Arshad Noor Siddiquee, Manu Srivastava
Journal- Transactions of the Indian Institute of Metals
Publisher-Springer India
Description- Friction stir processing forms an innovative and promising technology for surface composite fabrication where their fabrication is accomplished in solid state. In the current research, AA6063/SiC surface composites were fabricated and effect of ratio of groove width (w) to tool pin diameter (d) on dispersion of reinforcement particles and mechanical properties were investigated. Five varying groove widths were chosen at constant levels of tool dimensions and process parameters to observe the exclusive effect of variation of groove width on area of developed SCs. Results reflected that groove width have strong impact on the area of surface composites and a ratio of w/d of 0.5 was found optimum for developing high volume percentage of 40% of SiC reinforced surface composites. The results were supported by macro and microstructural images.
Effect of varying spatial orientations on build time requirements for FDM process.
Authors- Manu srivastava,Sandeep Rathee, Sachin Maheshwari, Arshad Noor Siddiquee
Journal- Defence technology
Publisher- Elsevier
Description- In this research, effect of varying spatial orientations on the build time requirements for fused deposition modelling process is studied. Constructive solid geometry cylindrical primitive is taken as work piece and modeling is accomplished for it. Response surface methodology is used to design the experiments and obtain statistical models for build time requirements corresponding to different orientations of the given primitive in modeller build volume. Contour width, air gap, slice height, raster width, raster angle and angle of orientation are treated as process parameters. Percentage contribution of individual process parameter is found to change for build time corresponding to different spatial orientations. Also, the average of build time requirement changes with spatial orientation.
Analysis of microstructural changes in enhancement of surface properties in sheet forming of Al alloys via friction stir processing
Authors- Manu Srivastava,Sandeep Rathee, Sachin Maheshwari, Arshad Noor Siddiquee
Journal- Materials Today: Proceedings
Publisher- Elsevier
Description- Weight reduction is one of the major objectives in engineering design and manufacturing, especially in automotive and aircraft industries. Aluminium (Al) alloys provide the solution for weight reduction in various structural applications. Forfurther enhancement ofsurface properties of these alloys, their surface composites are fabricated which exhibit high strength - weight ratio, better corrosion resistance, improved mechanical & wear properties as compared to base alloys. In this work, an attempt has been made to enhance the processed-layerhardness of AA 6063 sheets by synthesizing AA 6063/SiC surface composites using friction stir processing (FSP). Single pass FSP was performed on AA 6063 sheets using tool rotational speedat three levels of 900, 1120and 1400 rpm respectively.Traverse speed was maintained at a constant level of 40 millimetres/minute and tool tilt angle was kept at 2˚
Estimation of the effect of process parameters on build time and model material volume for fdm process optimization by response surface methodology and grey relational analysis
Authors- Manu Srivastava, Sachin Maheshwari, TK Kundra, Sandeep Rathee
Publisher-Springer, Singapore
Description- In this study, a hybrid optimization approach is proposed for build time and model material volume in Fused Deposition Modeling (FDM) process on a FDM Maxum Modeler. A combination of response surface methodology (RSM) and grey relational analysis (GRA) is proposed and applied to optimize process parameters of FDM process. The significant input parameters such as contour width, air gap, raster angle, and spatial orientation are considered, and build time and model material have been taken as responses for this study. Thirty experiments were conducted on acrylonitrile butadiene styrene (ABS) P400 for conical primitives using full factorial central composite design. The optimum process parameter conditions were obtained from grey relational grade.