目的 研究孔隙结构对多孔基体材料力学性能的影响,构建多孔材料弹塑性宏观等效模型,实现多孔材料拉伸过程中的预测。方法 通过工业CT对多孔材料的孔隙结构进行表征,并构建代表性体积单元（RVE）模型研究真实孔隙结构对多孔材料力学性能的影响。基于RVE模型结果和实验结果,通过通用的屈服准则描述材料的各向异性和拉压不对称性,通过Swift硬化准则描述材料的硬化行为,通过关联流动法则描述材料的屈服轨迹,以此构建多孔材料弹塑性力学性能等效模型。结果 多孔材料的孔隙结构导致材料出现各向异性特征,所构建的多孔材料的等效模型可以良好地模拟材料的各向异性特征,通过实验和有限元模拟对比,验证了等效模型的有效性。结论 多孔材料具有各向异性和拉压不对称性,在承受载荷时,孔隙之间形成应力集中区域,加速裂纹扩展;弹塑性等效模型可以精准地预测材料在承受载荷时的应力应变,实现大尺寸多孔材料的宏观变形模拟。
Abstract
The work aims to investigate the influence of pore structure on the mechanical properties of porous matrix materials, establish an elastoplastic macroscopic equivalent model for porous materials, and enable prediction of the forming behavior of large-scale porous matrices. The pore structure of the porous material was characterized using industrial computed tomography (CT), and representative volume element (RVE) models were constructed to analyze the effect of realistic pore morphology on the material’s mechanical response. Based on the results from both RVE simulations and experiments, the generalized yield criterion was employed to describe the material anisotropy and tension-compression asymmetry, while the Swift hardening law was used to represent the hardening behavior. The associated flow rule was adopted to capture the yield trajectory, thereby developing an equivalent elastoplastic constitutive model for the porous material. The pore structure of the porous material induced the distinct anisotropic mechanical behavior. The proposed equivalent model successfully reproduced the anisotropy in experiments, and its validity was verified through comparison between experimental results and finite element simulations. Porous materials exhibit both anisotropy and tension-compression asymmetry. Under external loading, stress concentration occurs between pores, accelerating crack propagation. The developed elastoplastic equivalent model can accurately predict the stress-strain response of porous materials under loading and enable macroscopic deformation simulations of large-scale porous structures.
关键词
发汗冷却 /
多孔结构 /
本构方程 /
各向异性 /
有限元模拟
Key words
transpiration cooling /
porous structure /
constitutive equation /
anisotropy /
finite element simulation
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基金
航天一院高校联合创新基金（CALT2023-08）
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