Implementation Of Parallel Computing Method For Numerical Simulation Of Additive Manufacturing Process

Additive manufacturing(AM),which attracts intensive attentions in recent years,is an advanced model-free manufacturing technology by means of the layered deposition of materials.Due to the complexity of the manufacturing process,it is very difficult to carry out accurate experimental measurements of physical quantities such as temperature and strain.Therefore,numerical simulation has become one of the main methods to analyze the additive manufacturing process,and the development of corresponding numerical simulation technology has important research significance and engineering practical value.This article takes the selective laser melting additive manufacturing process of metal materials as the research object,researches and develops the numerical simulation method and parallel computing technology of the process based on the finite element method,and develops the corresponding computer program.The main work can be summarized as the following four aspects:(1)The finite element method is used to discretize the governing equations and boundary conditions,and a numerical model of the selective laser melting additive manufacturing process is established.Corresponding to the increase of the material layer by layer,the calculation unit is also introduced layer by layer,and the grid coarsening is adaptively implemented for the area away from the current processing layer to reduce the calculation scale.(2)Carried out research work on parallel computing technology for numerical simulation of additive manufacturing process.Based on the area decomposition method,the parallelization of the Preconditioned Conjugate Gradient Method(PCG)is studied,and on the basis of this,the parallel calculation of the additive manufacturing process is established in combination with EBE(Element-by-Element)technology method.(3)The above algorithm is programmed,and the Fortran language and MPI library are used to write the code,and a parallel finite element calculation program for the additive manufacturing process is established.(4)The typical calculation examples such as titanium alloy thin plates are selected to verify the developed calculation program,and the accuracy of the calculation result and the parallel performance of the calculation program are analyzed in depth.The numerical results show that the numerical method established in this paper can effectively simulate the selective laser sintering additive manufacturing process and accurately reproduce the evolution of the temperature field.At the same time,the parallel computing method established in this paper has good parallel acceleration performance and scalability,and has good application potential for large-scale numerical simulation of the additive manufacturing process.