应变疲劳对20G钢材延性断裂韧度J_(IC)的影响  

Influence of strain fatigue on J_(IC)-ductile fracture toughness of 20G steel

作　　者：门长峰[1] 方陆鹏[1] 孙建军[1] 

机构地区：[1]天津工程师范学院机械工程系,天津300222

出　　处：《辽宁工程技术大学学报（自然科学版）》2008年第2期210-212,共3页Journal of Liaoning Technical University (Natural Science)

基　　金：天津市自然科学基金资助项目(043612211)

摘　　要：初步探讨了应变循环加载对20G钢材的延性断裂韧度JIC的影响,对各种情况20G材料延性断裂韧度JIC测试数据进行了比较,结果表明,应变循环加载对钢材的延性断裂韧度JIC的影响很明显,钢材单调拉伸0.3%应变后,材料的延性断裂韧度JIC均比未经单调拉伸0.3%应变时降低了11%。控制±0.3%全应变的循环加载500周后,延性断裂韧度JIC比未经单调拉伸0.3%应变时钢的延性断裂韧度JIC降低了35%,这种变化与Rice提出的循环加载变形功与J积分之间的函数关系比较符合。A preliminary investigation was made to test the influence of cyclic strain on JIC-fracture toughness of 20G steels, and a comparison was made of the test data of ductile fracture toughness of 20G steels on all kinds of conditions .The results show that the influence of cyclic strain on fracture toughness of 20G steels is obvious, after drawing 0.3% strain, the ductile fracture toughness of steels are all decreased by 11%. The cyclic strain loading controlled within a total strain of ±0.3% after 500 cycles, compared with the no drawing 0.3% strain steels, the ductile fracture toughness is decreased by 35%. The change is in correspondence to the function relationship between the cyclic loading strain energy and the integer J given by Rice.

关 键 词：应变疲劳 循环加载 断裂力学 延性断裂韧度 

分 类 号：TU973.254[建筑科学—结构工程]