目的 解决点阵夹层结构等效性能快速求解,同时保证其精确性。方法 基于python语言对Abaqus进行二次开发,创建梁单元点阵快速建模程序,结合代表体元法,提出一种新的基于梁单元的点阵夹芯结构等效参数快速辨识方法。结果 通过理论研究与数值方法的比较,使用该方法后,点阵的等效热参数、力学参数等误差可以控制在1%以内。结论 点阵夹层结构性能预测,梁单元比杆单元更加精确。点阵性能预测的误差主要来源于各向异性和接触刚度。使用新的等效参数辨识方法,可以将误差控制在1%以内,为点阵夹芯结构的等效性能预测提供了一种新的解决方案。
Abstract
Lattice meta-materials are widely used in aerospace engineering due to their exceptional mechanical properties such as ultra-lightweight, high specific strength, and high specific stiffness. However, their large number of cells and small size make it difficult to generate the grid and require a large amount of calculation, which seriously restricts their application development. Traditional lattice design methods demonstrate a good prediction of the equivalent performance of the lattice itself, but ignore the contact stiffness problem between the skin and the lattice. The work aims to have a rapid solution of the equivalent performance of lattice sandwich structures while ensuring accuracy. A rapid beam-element lattice modeling program was developedthrough python-based secondary development of Abaqus, and a novel rapid identification method was proposed for equivalent parameters of lattice sandwich structures using beam elements combined with the representative volume element (RVE) method. The results demonstrated that through the comparison of theoretical research and numerical methods, after using this method, the errors of the equivalent thermal parameters, mechanical parameters, etc. of the lattice could be controlled within 1%.For the performance prediction of lattice sandwich structures, beam elements are more accurate than bar elements. The errors in lattice performance prediction mainly stem from anisotropy and contact stiffness. By using the new equivalent parameter identification method, the error can be controlled within 1%, providing a new solution for the equivalent performance prediction of lattice sandwich structures.
关键词
梁单元 /
等效性能 /
参数辨识 /
代表体元法
Key words
beam element /
equivalent performance /
parameter identification /
representative volume element
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