Additive Manufacturing Constraints in Topology Optimization for Improved Manufacturability

作者：Mhapsekar Kunal; McConaha Matthew; Anand Sam^*

来源：Journal of Manufacturing Science and Engineering, Transactions of the ASME, 2018, 140(5): 051017.

DOI：10.1115/1.4039198

• design for additive manufacturing
• topology optimization
• thin features
• support structures

Additive manufacturing (AM) provides tremendous advantage over conventional manufacturing processes in terms of creative freedom, and topology optimization (TO) can be deemed as a potential design approach to exploit this creative freedom. To integrate these technologies and to create topology optimized designs that can he easily manufactured using AM, manufacturing constraints need to be introduced within the TO process. In this research, two different approaches are proposed to integrate the constraints within the algorithm of density-based TO. Two AM constraints are developed to demonstrate these two approaches. These constraints address the minimization of number of thin features as well as minimization of volume of support structures in the optimized parts, which have been previously identified as potential concerns associated with AM processes such as powder bed fusion AM. Both the manufacturing constraints are validated with two case studies each, along with experimental validation. Another case study is presented, which shows the combined effect of the two constraints on the topology optimized part. Two metrics of manufacturability are also presented, which have been used to compare the design outputs of conventional and constrained TO.

• 出版日期2018-5