LY12复合型断裂的实验研究  

EXPERIMENTAL STUDY ON LY12 UNDER MIXED MODE LOADING

作　　者：沙江波[1] 朱平[1] 邓增杰[1] 周惠久[1] 

机构地区：[1]广东工业大学材料系,清华大学机械工程系,西安交通大学材料科学与工程学院

出　　处：《固体力学学报》1996年第3期246-250,共5页Chinese Journal of Solid Mechanics

基　　金：国家教委博士点基金

摘　　要：应用有限元方法和断裂实验对铝合金ＬＹ１２在Ⅰ＋Ⅱ型复合载荷作用下的弹塑性断裂行为进行了研究，给出了复合型弹塑性断裂的Ｊ积分准则．结果表明：（１）不同复合型下启裂Ｊ积分值满足ＪⅠｉ／ＪⅠｃ＋ＪⅡｉ／ＪⅡｃ＝１、ＪＭＣ＝ＪⅠｉ＋ＪⅡｉ的关系．随Ⅱ型分量增加，启裂的Ｊ积分值ＪＭＣ增加，ＪⅡｃ为ＪⅠｃ的两倍；The elastic-plastic fracture of LY12 under mixed Ⅰ+Ⅱ mode loading was studied by finite element method and fracture test. A mixed mode elastic-plastic fracture criterion, J-integral criterion, was proposed. The results show that: (1 ) The initiation J-integral values of different mixed ratios satisfy equations JⅠi/JⅠC+JⅡi/JⅡC=1 JⅠi+JⅡi=JMC, the initiation J-integral increase with an increasing of mode Ⅱ component, and JⅡC is twice of JⅠC; (2) The relationship between JMC and mixed ratios is JMC=K2Ⅰ·JⅠC/(K2Ⅰ+αK2Ⅱ) +αK2Ⅱ·JⅠC/(K2Ⅰ+αK2Ⅱ), where α =JⅠC/JⅡC.

关 键 词：复合型 弹塑性 断裂 J积分 准则 

分 类 号：O346.1[理学—固体力学]