Load spectrum simplification method for aircraft construction crack extension test
A technology for crack propagation test and aircraft structure, applied in the field of load spectrum simplification for crack propagation test of aircraft structure, can solve problems such as increasing development cost, restricting aircraft development time, long fatigue test cycle, etc., achieving large engineering application value and shortening the test. The effect of cycle and method is simple and easy to implement
Active Publication Date: 2014-09-10
CHINA AIRPLANT STRENGTH RES INST
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The invention discloses a load spectrum simplification method for an aircraft construction crack extension test. The load spectrum simplification method comprises the following steps: (1) determining the structural type of a crack extension test piece and a material containing a crack part, and determining the fatigue crack extension threshold value deltaKth of the material; (2) determining a stress intensity factor of a crack tip of the material; (3) estimating the crack length in the crack extension test and processing in a segmenting manner; (4) deleting the stress cycle lower than the fatigue crack extension threshold value in a load spectrum according to the segmentation condition to form a load spectrum corresponding to the lengths of the segments of the crack, and finally applying the load spectrum in the crack extension test. The load spectrum simplification method disclosed by the invention is used for determining the cark tip stress intensity factor value of a crack-containing structure and simplifying the load spectrum for the crack extension test in the segmenting manner in combination with the fatigue crack extension threshold value deltaKth of the material, so that the load spectrum can be directly applied in the aircraft construction crack extension test, and the method is simple and feasible and is capable of effectively shortening the test period.
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