Fatigue damage rule of LY12CZ aluminium alloy under sequential biaxial loading  

作　　者：WANG YingYu ZHANG DaChuan YAO WeiXing 

机构地区：[1]Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第1期98-103,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.10702027);Aviation Science Funds of China(Grant No.2011ZA52016);Program for Changjiang Scholars and Innovative Research Team in University(Grant No.Irt0906)

摘　　要：A series of biaxial two-level variable amplitude loading tests are conducted on smooth tubular specimens of LY12CZ alumin- ium alloy. The loading paths of 90° out-of-phase, 45° out-of-phase and 45° in-phase are utilized. The fatigue damage cumulative rules under two-level step loading of three loading paths are analyzed. By introducing a parameter a which is a function of the phase lag angle between the axial and the torsional loading, a new multiaxial nonlinear fatigue damage cumulative model is proposed. The proposed model is evaluated by the experimental aluminium alloy, and multi-level loading of 45 steel. Fatigue lives data for two-level loading, multi-level loading of LY12CZ predicted are within a factor of 2 scatter band.A series of biaxial two-level variable amplitude loading tests are conducted on smooth tubular specimens of LY12CZ aluminium alloy.The loading paths of 90°out-of-phase,45°out-of-phase and 45°in-phase are utilized.The fatigue damage cumulative rules under two-level step loading of three loading paths are analyzed.By introducing a parameter which is a function of the phase lag angle between the axial and the torsional loading,a new multiaxial nonlinear fatigue damage cumulative model is proposed.The proposed model is evaluated by the experimental data for two-level loading,multi-level loading of LY12CZ aluminium alloy,and multi-level loading of 45 steel.Fatigue lives predicted are within a factor of 2 scatter band.

关 键 词：multiaxial fatigue fatigue damage rule nonproportional loading variable amplitude loading 

分 类 号：TG146.21[一般工业技术—材料科学与工程] O346.2[金属学及工艺—金属材料]