基于Voronoi模型的钽材料孔隙率与弹性模量辨识

Identification of the poprosity and elastic modulus of tantalum materials based on Voronoi model

多孔材料的弹性模量辨识,是研究多孔材料力学性能的重要部分。采用三维Voronoi随机分布模型,研究了多孔钽在准静态载荷作用力下的力学性能。建立给定孔密度下的Voronoi随机分布模型,并以梁单元的形式构建有限元模型,通过改变梁单元直径构造同一微结构下的不同孔隙率模型,进行有限元力学分析,辨识不同孔隙率下多孔模型的等效弹性模量。对实验结果数据进行分析,验证所辨识多孔模型等效弹性模量与孔隙率关系,与实验结果一致。

The identification of elastic modulus is important for the study of the mechanical properties of porous materials. The mechanical properties of the porous tantalum under the quasi static loading force were studied by a three - dimensional Voronoi random distribution model. The Voronoi random distribution model with given porosity was built, and the finite ele- ment model was built in the form of beam element. By changing the diameter of beam element, different porosity models with the same microstructure were constructed. The equivalent elastic modulus of the porous model under different porosity was i- dentified by the finite element analysis. The results show that the relationship between the equivalent elastic modulus of the i- dentified porous model and the porosity is in agreement with the experimental results.