采用显微网格法研究韧性材料平面应力状态下裂尖附近的应变场  

The Experimental Strain Field Ahead of Stationary Crack Tip in Ductile Metals

作　　者：周忠良[1] 顾家琳[1] 陈南平[1] 

机构地区：[1]清华大学

出　　处：《实验力学》1994年第3期214-218,共5页Journal of Experimental Mechanics

摘　　要：用显微网格数字图系处理方法，测量了韧性材料平面应力条件下互型单边裂纹尖端附近的应变场。实验结果表明：在裂尖两侧存在与裂纹方向夹角约为５０°的大变形带。最大应变位于离裂尖一定距离的大变形带上，随着载荷增加，最大应变的位置逐渐靠近裂纹尖端。应变峰值轨迹线在裂纹顶端是放射状，载荷增加时，应变峰值的轨迹线位置并不改变。The strain field ahead of a stationary crack tip with plane stress deformation in ductile metal was measured with SEM, by micro grid method and digital image processing. Large deformation bands were observed at each side of the crack. Maximum strain points were positioned on the large deformation bands at a distance from crack tip. The maximum strain points moved towards crack tip as load increased.

关 键 词：裂纹 显微网格 应变场 实验应力分析 

分 类 号：O348[理学—固体力学]