FATIGUE CRACK CLOSURE MEASUREMENT OF 2024-T3 SHEET SPECIMEN  

作　　者：Wu Yisheng(Instilute of Mechanics, Chinese Academy of Sciences, Beij ing, China, 100080)J. Schijve(Faculty of Aerospace Engineering, Delf t University of Technology, Netheriands) 

出　　处：《Chinese Journal of Aeronautics》1994年第3期207-212,共6页中国航空学报（英文版）

摘　　要：computer controled procedure is developed for automatic measurementsof the crack opening stress Sop dunng fatigue tests. A crack opening displacement gauge(COD meter) is used to obtain digital data on the load-COD curves. Three methods forderiving S op from the data sets are compared:(1) slope method, (2) tangent lines inter-secting method, and (3) tangent point method. The effect of the position of the CODmeter with respect to the crack tip on Sop is studied in tests of 2024-T3 specimens. Re-sults of crack growth and Sop are presented for CA loading with an overload and withan overload followed by an underload.computer controled procedure is developed for automatic measurementsof the crack opening stress Sop dunng fatigue tests. A crack opening displacement gauge(COD meter) is used to obtain digital data on the load-COD curves. Three methods forderiving S op from the data sets are compared:(1) slope method, (2) tangent lines inter-secting method, and (3) tangent point method. The effect of the position of the CODmeter with respect to the crack tip on Sop is studied in tests of 2024-T3 specimens. Re-sults of crack growth and Sop are presented for CA loading with an overload and withan overload followed by an underload.

关 键 词：FATIGUE crack closure stress analysis 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]