稳恒扩展裂纹尖端的弹粘塑性场  

The Elastic-viscoplastic Field of a Steady Propagating Crack Tip

作　　者：贾斌 王振清[1] 李永东[1] 范学伟[2] 

机构地区：[1]哈尔滨工程大学,哈尔滨150001 [2]北方交通大学,北京100044

出　　处：《应用力学学报》2003年第1期64-69,162,共6页Chinese Journal of Applied Mechanics

基　　金：黑龙江省博士后启动基金资助

摘　　要：采用弹粘塑性力学模型代替通常的弹塑性模型 ,对于Ⅰ型和Ⅱ型问题 ,分别求得了不可压缩材料中平面应变动态扩展裂纹尖端的指数奇异性场和对数奇异性场 ,消除了弹塑性解中存在的塑性激波。通过数值计算 ,分别求得了两种奇异属性的分界线 。An elastic-viscoplastic model is adopted to replace t he ordinary elastic-plastic one in this paper. Based on this, for mode I and II p roblems, the power law and logarithm singular tip field moving crack of an inco mpressible material under plane strain is obtained respectively. The results sho w that the plastic shock existed in elastic-plastic model is eliminated. The di vision of the two singular fields is obtained through numerical computation and the unified singular crack-tip field is established.

关 键 词：弹粘塑性材料 动态扩展 粘性系数 马赫数 

分 类 号：O34[理学—固体力学]