Experimental Investigations of the Effectiveness of Simultaneous Topology/Orientation Optimization via SOMP and Principal Stress Directions
Experimental Investigations of the Effectiveness of Simultaneous Topology/Orientation Optimization via SOMP and Principal Stress Directions
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DOI：
10.1016/j.matdes.2022.110647
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Bailey Brown;Nadim S Hmeidat;Xiu Jia;J. Wilt;Michael Roberts;B. Compton;N. Vermaak
中科院分区：
文献类型：
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作者：
Bailey Brown;Nadim S Hmeidat;Xiu Jia;J. Wilt;Michael Roberts;B. Compton;N. Vermaak
本文提出了一种基于主应力法的三维正交各向异性材料惩罚（SOMP）拓扑和取向同时优化的分析。进行了数值案例研究，以评估预期的好处，包括在设计过程中的最小顺应性结构在单一的负载情况下，印刷正交各向异性材料的方向。特别是，在拓扑优化（TO）过程中，与不考虑正交各向异性材料取向的结构设计之间进行了比较。直接墨水书写（DIW）增材制造（AM）被用来打印实验样本，在弯曲测试，以验证数值结果。新奇的工作中心的优化拓扑结构设计与SOMP和制造通过DIW的性能的实验评估。此外，新的知识以相应的数值和物理实验的形式呈现，其表明，利用基于主应力的材料取向更新方案，可以通过以下方式实现关于柔度的等效性能：1）优化拓扑和取向，同时在TO期间使用最大面内主应力方向控制正交各向异性材料取向;或2）假设等效各向同性性质，优化拓扑，并在优化后沿沿着主应力方向替换原始正交各向异性性质。这一实验验证的发现证实，包括方向的顺应性为基础的设计框架AM结构正交各向异性材料是不利的。对于单一载荷情况，使用标准的带惩罚的固体各向同性材料（SIMP）方法进行设计，然后在设计完成后将材料方向与主应力方向对齐，就足以获得等效的性能优势。
This article presents an analysis of simultaneous topology and orientation optimization based on a principal stress method within the Solid Orthotropic Material with Penalization (SOMP) framework. Numerical case studies were done to assess the expected benefits of including orientation in the design process for minimum compliance structures under single load cases printed with orthotropic materials. In particular, comparisons were made between structures designed with and without consideration of orthotropic material orientations during the topology optimization (TO) process. Direct-Ink Writing (DIW) additive manufacturing (AM) was used to print experimental specimens, which were tested in bending to validate numerical results. The novelty of the work centers on the experimental evaluation of the performance of optimized topologies designed with SOMP and manufactured via DIW. Additionally, new knowledge is presented in the form of corresponding numerical and physical experiments showing that with a principal-stress based material orientation updating scheme, equivalent performance can be achieved with respect to compliance by 1) optimizing topology and orientation concurrently with orthotropic material orientations controlled during TO using maximum in-plane principal stress directions; or 2) optimizing topology assuming equivalent isotropic properties, and substituting the original orthotropic properties along principal stress orientations post-optimization. This experimentally validated finding confirms that including orientation in the compliance-based design framework for AM of structures with orthotropic materials is not advantageous. For single load cases, using the standard Solid Isotropic Material with Penalization (SIMP) method for design purposes and then aligning material orientations with principal stress orientations after the design is produced is sufficient for obtaining equivalent performance benefits.