Multi-objective optimisation of DMLS process parameters using evolutionary algorithm

Abstract

A multi-objective optimisation study is carried out for direct metal laser sintering process (DMLS). In order to optimise the individual process parameters and mechanical properties, analysis of variance (ANOVA) methods were used. Experiments were conducted by varying the process parameters using Taguchi’s modified L8 orthogonal array method. Mechanical properties such as fatigue cycles to failure, tensile strength, compressive strength, hardness and wear rate of components have been ascertained and a mathematical model has been developed using multi-variable linear regression analysis. Genetic algorithm (GA) was used to carry out final multi-objective optimisation studies. Optimal process parameters for better mechanical properties were observed by initiating multi-objective optimisation using genetic algorithm. By selecting better process parameters, components could be manufactured in the near future with improved mechanical properties. Results obtained will be useful to manufacturing components for fu...