非晶态高聚物裂尖银纹损伤场  

Craze Damage Field Near the Crack Tip of Non crystalline Polymers

作　　者：揭敏[1,2,3,1] 李银平[1,2,3,1] 邓泽贤[1,2,3,1] 李长春 

机构地区：[1]华中理工大学 [2]岳阳大学 [3]香港理工大学

出　　处：《应用力学学报》1998年第3期7-12,共6页Chinese Journal of Applied Mechanics

基　　金：西安交通大学机械强度与振动国家重点实验室开放基金

摘　　要：在非晶态高聚物裂端塑性区引入银纹损伤，提出了一个修正的Ｄｕｇｄａｌｅ模型，并由它确定塑性区的大小，算例表明，银纹损伤导致了塑性区深度的增加．。，此外，在Ｄｕｇｄａｌｅ模型下研究了稳态扩展的裂端塑性区，在裂纹缓慢扩展、小范围银纹化以及材料为线粘弹性等假定下，由能量原理得到了控制裂纹生长的一个非线性微分一积分方程，从中看到银纹损伤的影响十分显著。Craze damage is introduced in the plastic region near the crack tip of non crystalline polymers. A modified Dugdale model is proposed, from which the size of the plastic region is determined. Example shows that the craze damage leads to the increasing of the size of plastic region. Besides, the plastic region near the steadily extending crack tip is studied under Dugdale model. Based on such assumptions as slowly extending crack, small scale crazing and linear viscoelastic materials, etc., a nonlinear differential integral equation governing the crack growth is obtained, via the energy principle. From this equation, it is found that the effect of craze damage is rather dominant.

关 键 词：非晶态高聚物 裂尖 银纹损伤 

分 类 号：O631.21[理学—高分子化学]