期刊
MATERIALS
卷 11, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/ma11112073
关键词
lattice structures; additive manufacturing; infilled structure finite-element-mesh based method; MIST method
类别
资金
- National Natural Science Foundation of China [11332004]
- 111 Project [B14013]
- Fundamental Research Funds of China [DUT18ZD103, DUT18RC(4)070]
- Central Universities of China [DUT18ZD103, DUT18RC(4)070]
A parameterization modeling method based on finite element mesh to create complex large-scale lattice structures for AM is presented, and a corresponding approach for size optimization of lattice structures is also developed. In the modeling method, meshing technique is employed to obtain the meshes and nodes of lattice structures for a given geometry. Then, a parametric description of lattice unit cells based on the element type, element nodes and their connecting relationships is developed. Once the unit cell design is selected, the initial lattice structure can be assembled by the unit cells in each finite element. Furthermore, modification of lattice structures can be operated by moving mesh nodes and changing cross-sectional areas of bars. The graded and non-uniform lattice structures can be constructed easily based on the proposed modeling method. Moreover, a size optimization algorithm based on moving iso-surface threshold (MIST) method is proposed to optimize lattice structures for enhancing the mechanical performance. To demonstrate the effectiveness of the proposed method, numerical examples and experimental testing are presented, and experimental testing shows 11% improved stiffness of the optimized non-uniform lattice structure than uniform one.
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