双轴加载下缺口疲劳裂纹萌生位置的研究  

STUDY ON FATIGUE CRACK INITIATION SITE OF NOTCHED TUBULAR SPECIMEN UNDER BIAXIAL LOADING

作　　者：王英玉[1] 姚卫星[1] 

机构地区：[1]南京航空航天大学航空宇航学院飞行器系,南京210016

出　　处：《机械强度》2004年第z1期12-14,共3页Journal of Mechanical Strength

基　　金：博士点基金 (2 0 0 2 0 2 870 2 2 );南京航空航天大学博士学位论文创新与创优基金 (40 0 3 0 1 90 0 1 )~~

摘　　要：对航空材料LY12CZ进行多种比例和非比例加载试验。分别采用弹性力学方法及弹塑性有限元方法对多轴加载下缺口试件缺口孔边应力应变进行分析 ,探讨疲劳裂纹萌生位置与孔边应力、应变的关系。试验与分析结果对照表明 。Various proportional and nonproportional tension-torsion fatigue tests were conducted on aeronautic material, LY12CZ. The stress and strain tensors on the edge of the notch were analyzed by elasticity mechanics method and elasto-plastic finite element method, respectively. Relations between the site of crack initiation and each stress and strain tensor were investigated. The comparison between experimental and analytical results shows that the distributions of relative amplitude of the maximum shear stress and strain are consistent with that of the fatigue cracks under all tested loading cases.

关 键 词：多轴疲劳 比例加载 非比例加载 裂纹萌生 破坏准则 有限元法 

分 类 号：O346.2[理学—固体力学] TG111.8[理学—力学]