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| An additional gravity field method for topology optimization of cast parts |
| Received:May 20, 2021 Revised:June 15, 2021 |
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| DOI：10.7511/jslx20210520411 |
| KeyWord:topology optimization manufacturability casting constraint internal cavity undercut |
| Author | Institution |
| 马晶 |
大连理工大学 工程装备结构分析国家重点实验室, 大连 |
| 亢战 |
大连理工大学 工程装备结构分析国家重点实验室, 大连 |
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| Abstract: |
| In this paper, a new form of casting constraints is proposed to optimize a casting structure. First, under the framework of variable density topology optimization, a concept of inverse structure of topology optimized structure described by the relative density is proposed. Then, a gravity load on the inverse structure is applied and the boundaries in the demolding directions are fixed. Finally, the casting constraints are constructed using the displacement field solution of the inverse structure. By applying a single constraint to the maximum compliance of the inverse structure, non-castable features (including internal cavities and undercuts) can be avoided in the optimized structure, thus ensuring the manufacturability of the optimized casting part. Numerical examples in 2D and 3D design domains verify the effectiveness of the method. The numerical results indicate that the proposed casting constraint expressed by an integral function is in nature a single constraint, and facilitates solution of the topology optimization problems. |
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