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Abstract: Interest in lightweight geometries and cellular structures has increased due to the freeform capabilities of additive manufacturing technologies. In this paper, six different cellular structures were designed and parameterised with three design variables to carry out the lightweight optimisation of an initial solid sample. According to the limitations of conventional computer-aided design (CAD) software, a new parametric optimisation method was implemented and used to optimise these six types of structures. The best one in terms of optimisation time and stiffness was parameterised with nine design variables, changing the dimensions of the internal cellular structure and the reinforcement zones. These seven optimised geometries were manufactured in a Phenix ProX200 selective laser melting machine without using support. The samples obtained were tested under flexural load. The results show that the cubic cell structures have some advantages in terms of CAD definition, parameterisation and optimisation time because of their simpler geometry. However, from the flexural test results it can be concluded that this type of cell structure and those with horizontal bars experience a loss of stiffness compared to the estimates of the finite element analysis because of imperfections in the manufacturing process of hanging structures.

The paper deals with the optimization of cellular structures be produced through the Selective Laser Melting (SLM) technique. The subject of the paper is very interesting, since the use of optimization methodologies for the design of parts which can be produced through Additive Manufacturing (AM) is a current subject of research among universities and industries. Moreover, cellular structures permit for lightweight design, which is currently of utmost interests.

通过新型轻量化参数优化方法比较激光选区熔化部件设计的不同细胞结构

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