基于三相球模型确定泡沫塑料有效模量

DETERMINATION OF EFFECTIVE MODULI FOR FOAM PLASTICS BASED ON THREE PHASE SPHEROIDAL MODEL

通过复合材料三相球模型确定泡沫塑料的体积模量、剪切模量、杨氏模量和油松比等材料参数与材料孔隙比的关系，并将该文结果同微分法得到的结果进行了对比；结果表明：三相球模型确定的材料参数在相同孔隙比情况下，一般都高于微分法确定的结果．两种方法得到的有效剪切模量和杨氏模量差异较小，而体积模量（对不可压缩基体材料）和泊松比则差异较大．然而，由三相球模型确定的泡沫塑料杨氏模量仍可与实验较好地符合．此外，该文结果也同现有的理论及实验结果进行了对比．

The relations of bulk modulus,shear modulus,Young's modulus and Poisson's ratio with porosity of foam plastics are determined by a three phase spheroids model commonly used in Composite Mechanics.The results are compared with that of using differential scheme.It is shown that the material properties derived from the present model normally are larger than those obtained by differential scheme for foam plastics with same porosity.The differences in shear moduli and Young's moduli obtained by the two methods are small,but they are larger for bulk moduli of incompressible matrix and Poisson's ratios.The Young's moduli of high density foam plasticsderived by the present model agree better with experimental ones.