Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 35, Issue 4, Pages 1609-1622Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-021-0324-7
Keywords
Multi-lattice structure; Strut-based design; Equivalent elastic properties; Topology optimization; Additive manufacturing; DfAM
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2019R1A5A808320112]
- Human Resources Program in Energy Technology of Energy Technology Evaluation and Planning (KETEP) in Korea [20184010201660]
- KETEP project [20173030041340]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20173030041340] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, an effective approach for designing a multi-lattice structure was proposed to optimize local densities and strut fillet-joint shape for practical equivalent material properties. By changing the strut diameter and fillet-joint radius based on loading conditions, the equivalent material properties of the MLS were calculated using a computational homogenization method. Results showed that the multi-lattice bending structure had significantly higher strength compared to a uniform BCC lattice structure with the same weight.
We propose an effective approach for designing a multi-lattice structure (MLS) that simultaneously considers local densities and the fillet-joint shape of struts to express practical equivalent material properties. The density of each cell is optimized by changing the strut diameter and fillet-joint radius according to loading conditions. The equivalent material properties of MLS, such as elastic modulus and shear modulus, are calculated based on a computational homogenization method. Finite element analyses of the full-shape and homogenized lattice model under external compressive load are conducted to evaluate the equivalent material properties. We also designed an optimized three-point bending structure using the proposed method. Based on the results of the topology optimization, three types of lattices with different relative densities are designed in a local zone considering local deformation modes. The result of this work shows that multi-lattice bending structure has about 86.9 % higher strength than that of a uniform BCC lattice structure with the same weight.
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