残留压缩应力对倾斜裂纹变形的影响  

Study on effect of compressive residual stress around slant crack to bending fatigue crack propagation behavior

作　　者：黎庆[1] 马有理[2] 

机构地区：[1]黑龙江省石油化学研究院,哈尔滨150040 [2]哈尔滨商业大学轻工学院,哈尔滨150028

出　　处：《哈尔滨商业大学学报（自然科学版）》2007年第4期501-504,共4页Journal of Harbin University of Commerce：Natural Sciences Edition

摘　　要：对于具有中心孔的混合型条件下的裂纹,提出了用沿着裂纹的不连续变位量来直接计算裂纹的Ⅰ型和Ⅱ型应力扩大系数(KⅠ)mes和(KⅡ)mes的方法.在拉伸载荷的作用下,利用这种方法讨论了裂纹上下表面接触和裂纹周围存在的压缩残留应力对(KⅠ)mes和(KⅡ)mes产生的影响.其结果是,压缩残留应力的存在使(KⅠ)mes减小的同时,裂纹上下表面的相互接触使(KⅡ)mes下降.For cracks with a center-hole notch under mixed-mode conditions, a method is proposed in which mode Ⅰ and mode Ⅱ stress intensity factors （KⅠ ）mes and （KⅡ ）mes can be directly evaluated from the discontinuous displacement along a crack. Using this method, the effect of crack surface roughness and compressive residual stress on （KⅠ ）mes and （KⅡ）mes is discussed under tensile loading. As a result, （KⅠ ）mes reduced due to compressive residual stress around the crack, and at the same time （ KⅡ ） mes declined because of the crack surface contact.

关 键 词：混合型 不连续变位量 压缩残留应力 表面接触 

分 类 号：TU510[建筑科学—建筑技术科学]