橡胶类材料大应变硬化的本构关系

Constitutive Law of Hardening Rubber-Like Material with Large Strain

橡胶材料具有良好的弹性性能和拉伸能力,为典型的超弹性材料.其在大应变时常呈现出应力-应变的增强或软化效应,本构关系较复杂.目前,有关橡胶材料大应变硬化的本构关系实验研究尚属匮乏.文中对橡胶类材料大应变时的硬化现象进行了实验和理论研究,提出了一种新的应变能函数来描述橡胶材料的本构关系,测定了橡胶材料硬化时的本构参数,并进行了实验验证.研究结果表明该应变能函数可较好地描述橡胶材料在大应变时的硬化现象,为进一步研究橡胶材料硬化的本构特性提供了参考依据.

Rubber-like material is a typical kind of hyperelastic material with good elasticity and stretching capacity. It displays stress-strain hardening or softening when subjected to large strain. The constructive law of rubberlike material is complicated and few experimental researches have been carried out on it. The hardening phenomenon of rubber-like material is experimentally and theoretically investigated in this paper, and a new strain-energy function is put forward to describe the constitutive law of the material. The corresponding constitutive parameters of the material are then measured and verified by experiments. The results indicate that the proposed strain-energy function accord well with the hardening phenomenon of rubber-like material and can be used as a theoretical basis for the investigation into the constitutive law of hardening material.