Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis  

作　　者：LEI ZhengQiang XIE JiJia SUN ChengQi HONG YouShi 

机构地区：[1]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics, Chinese Academy of Sciences [2]PetroChina Pipeline R&D Center

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第1期74-82,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2012CB937500);the National Natural Science Foundation of China(Grant Nos.11172304,11021262 and 11202210)

摘　　要：The specimens of a high carbon chromium steel were quenched and tempered at 150℃, 180℃ and 300℃. Such specimens were tested via rotating bending and a push-pull type of axial loading to investigate the influences of loading condition on the behaviour of very-high-cycle fatigue （VHCF）. Experimental results show the different influences of inclusion size on the fa- tigue life for the two loading conditions. Predominant factors and mechanism for the fine-granular-area （FGA） of crack origin were discussed. In addition, a reliability analysis based on a modified Tanaka-Mura model was carried out to evaluate the sen- sitivity of inclusion size, stress, and AKFGA to the life of VHCF crack initiation.The specimens of a high carbon chromium steel were quenched and tempered at 150°C,180°C and 300°C.Such specimens were tested via rotating bending and a push-pull type of axial loading to investigate the influences of loading condition on the behaviour of very-high-cycle fatigue(VHCF).Experimental results show the different influences of inclusion size on the fatigue life for the two loading conditions.Predominant factors and mechanism for the fine-granular-area(FGA)of crack origin were discussed.In addition,a reliability analysis based on a modified Tanaka-Mura model was carried out to evaluate the sensitivity of inclusion size,stress,and KFGA to the life of VHCF crack initiation.

关 键 词：very-high-cycle fatigue FGA loading condition life scatter INCLUSION 

分 类 号：TG142.15[一般工业技术—材料科学与工程]