低温环境下TC4ELI钛合金三维疲劳裂纹扩展模型  

Three-Dimensional Fatigue Crack Growth Model of TC4ELI Titanium Alloy at Low Temperature

作　　者：周如江 于培师 吴连生 韦朋余[3] 赵宇翔 赵军华 ZHOU Rujiang;YU Peishi;WU Liansheng;WEI Pengyu;ZHAO Yuxiang;ZHAO Junhua(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment&Technology,Jiangnan University,Wuxi 214122,China;School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China;China Ship Science Research Center,Wuxi 214082,China)

机构地区：[1]江南大学江苏省食品先进制造装备技术重点实验室,无锡214122 [2]江南大学机械工程学院,无锡214122 [3]中国船舶科学研究中心,无锡214082

出　　处：《机械工程材料》2023年第12期87-92,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(11972171);中国博士后科学基金资助项目(2018M630513);船舶整体性能创新研究开放基金资助项目(C21222024)。

摘　　要：利用疲劳试验机及扫描电镜研究了不同温度(20,-20,-40,-60℃)下不同厚度(12.5,9.0,6.0,3.0 mm)TC4ELI钛合金的疲劳裂纹扩展行为,建立低温环境下该合金的三维疲劳裂纹扩展模型。结果表明:由于闭合效应,减小厚度或降低温度均会减缓试验合金的疲劳裂纹扩展速率,Paris二维公式中的材料参数C和n并非常数;而在三维疲劳裂纹扩展理论框架下,修正后的Paris三维公式中的材料参数C_(eff)和n_(eff)均为常数,建立的三维疲劳裂纹扩展模型可以对不同温度下不同厚度试验合金的疲劳裂纹扩展行为进行归一化描述。Fatigue crack propagation behaviors of TC4ELI titanium alloy with different thickness(12.5,9.0,6.0,3.0 mm) at different temperatures(20,-20,-40,-60 ℃)were studied with fatigue testing machine and scanning electron microscope, and the three-dimensional fatigue crack growth model at low temperature of the alloy was established. The results show that due to the closure effect, the fatigue crack propagation rate of the test alloy decreased by decreasing the thickness or temperature, and the material parameters C and n in Paris two-dimensional formula were not constant. Under the framework of three-dimensional fatigue crack growth theory, the material parameters C_(eff) and n_(eff) in the revised Paris formula were both constanted, indicating that the established three-dimensional fatigue crack growth model could normalize the fatigue crack growth of the test alloys with different thickness at different temperatures.

关 键 词：TC4ELI钛合金 低温环境 三维理论 疲劳裂纹扩展寿命 

分 类 号：TG146.2[一般工业技术—材料科学与工程]