泡沫铝率相关性能的有限元模拟

构建了三维随机分布球形泡孔模型，模拟开、闭孔混合结构泡沫铝材料的微细观结构，并通过有限元方法计算了10~104 s-1应变率范围内、孔隙率35%~65%泡沫铝材料的率相关性以及应变率和相对密度变化对泡沫铝动态压缩力学性能的影响。研究表明:中、低应变率下，泡沫铝材料率相关性能主要取决于基体材料的应变率敏感性；高应变率下，泡沫铝材料率相关性能受基体材料的应变率敏感性以及微结构惯性联合作用，且相对密度较低泡沫铝材料的微结构惯性效应更显著。

Finite element simulation on the rate-dependent properties of aluminum foams

To examine the rate-dependent properties of aluminum foams, three-dimensional random spherical cell models were constructed to simulate the microstructures of aluminum foams, and the dynamic deformations of aluminum foams at the strain rates of 10-10 000 s-1 were calculated by using the ANSYS/LS-DYNA commercial code.Obtained results show that at moderate and low strain rates, the rate-dependent properties of aluminum foams originate mainly from the strain-rate sensitivities of their matrix materials.At high strain rates, the rate-dependent properties of aluminum foams are dominated by the combining action of the strain rate sensitivity of cell materials and the microstructure inertia of cells, and the microstructure inertia effects are more remarkable for aluminum foams with low relative density than for those with high relative density.