GROWTH BEHAVIOR OF SHORT FATIGUE CRACKS FOR ALUMINUM- LITHIUM ALLOY 8090

作     者：Chen Zheng Northwestern Polytechnical University 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：1991年第6卷第4期

页      面：380-385页

核心收录：

学科分类：08[工学] 0825[工学-航空宇航科学与技术] 

主　　题：this Figure LITHIUM ALLOY 8090 GROWTH BEHAVIOR OF SHORT FATIGUE CRACKS FOR ALUMINUM 

摘      要：The growth behaviors of short through cracks (0.2 △a 2.2mm) and long cracks are compared using CT type specimens in aluminum-lithium alloy 8090 T651. It is found that the short cracks grow much more than long ones and are observed to grow at the stress intensity ranges far below the long crack threshold. The distinction of growth bahavior between short and long cracks is attributed to the difference of their crack closure effect. The growth behavior of short cracks can be rationalized with that of long ones in terms of effective stress intensity ranges. The upper demarcation value of short through cracks for aluminum-lithium alloy 8090 is presented.