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为建立闭孔泡沫金属材料泡孔及其孔壁结构形状数字化模型,提出在Voronoi多面体内填充空心椭球(Hollow Ellipsoid Filled in Voronoi Cell,HEFIVC),并以椭球半轴长度及其方位角为变量、胞体质量最小为目标建立优化模型,迭代模拟闭孔泡沫金属材料中气泡的长大过程,成功构建了不同孔隙率的泡沫铝几何模型。通过拟合确定了HEFIVC模型中最小孔壁厚度与孔隙率间的关系。将具有周期性边界的闭孔泡沫材料HEFIVC几何模型导入MSC.MARC有限元软件,模拟分析了低孔隙率泡沫铝的静态压缩力学性能,通过与泡沫铝压缩实验结果对比,验证了该模型的准确性。
In order to establish the numerical model of closed-cell foam metal and the shape of the cell wall, a Voronoi polyhedron filled with Hollow Ellipsoid Filled in Voronoi Cell (HEFIVC) was proposed. The ellipsoidal Filled in Voronoi Cell (HEFIVC) Variable and cell body mass were optimized to establish the optimization model. The bubble growth process in closed-cell foam metal was simulated iteratively. The geometric model of aluminum foam with different porosity was successfully constructed. The relationship between the minimum wall thickness and the porosity in the HEFIVC model was determined by fitting. The closed-cell closed-cell foam HEFIVC geometry model was imported into the MSC.MARC finite element software to simulate and analyze the static compressive mechanical properties of the low porosity aluminum foam. Comparing with the aluminum foam compression experiment, the accuracy of the model was verified Sex.