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.
出处
《固体力学学报》
CAS
CSCD
北大核心
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
关键词
复合型
弹塑性
断裂
J积分
准则
mixed mode
elastic-plastic fracture
J-integral
criterion
