应变疲劳对钢材延性断裂韧度J_(IC)的影响  

Influence of strain fatigue on J_(IC)—the ductile fracture toughness of steels

作　　者：方陆鹏[1] 孙建军[1] 门长峰[1] 

机构地区：[1]天津工程师范学院机械工程系,天津300222

出　　处：《天津工程师范学院学报》2007年第1期21-24,共4页Journal of Tianji University of Technology and Education

基　　金：天津市自然科学基金资助项目(043612211)

摘　　要：应用应变疲劳能量损耗的理论和弹塑性断裂力学的J积分理论,初步探讨了钢材的应变循环加载对延性断裂韧度JIC的影响。通过对20G钢和16Mn热轧钢板两种钢材的应变循环加载前、后两种状态的延性断裂韧度JIC测试数据的比较,考察了这种影响的存在。测试结果表明,±0.3%全应变控制的循环加载,经历500周次后可使两种钢材的JIC数值产生15%以上的改变量。对于20G钢,这种变化与Rice给出的循环加载变形功与J积分之间的函数关系相对应;而对于16Mn钢则有较大的差异,其原因有待于进一步的研究。By applying the theory of strain fatigue energy loss and the theory of intrigue 2c in elasto-plastic fracture mechanics, a preliminary investigation was made in this research to test the influence of cyclic strain on JIC-the ductile fracture toughness of steels. Through a comparison of the steel＇ s ductile fracture toughness JIC of 20G steel and 16Mn steel before and after the cyclic strain was loaded, the influence was founded to exist. The test results showed that the cyclic strain loading controlled within a total strain of ± 0.3% after 500 cycles had caused the JIC of the two steels to change more than 15%. For the 20G steel, the change was in correspondence to the function relationship between the cyclic loading strain energy and the integer J given by RICE, but for the 16Mn steel, there was a greater deviation in the correspondence, the underlying reason of which is worth further research.

关 键 词：应变疲劳 循环加载 延性断裂韧度 

分 类 号：TB320.3[一般工业技术—材料科学与工程]