一种多部位损伤全寿命分析的工程方法

doi:10.7527/S1000-6893.2020.24328

Abstract

Abstract: An engineering method of full life for structure with multiple site damage is proposed. consists of three parts. For multiple crack initiation, the incident crack initiation life of multiple detail structure with a certain value is transformed into the intersection of three independent incidents. The probability of the former incident is the product of the probability of the latter three independent incidents derived from the probability distribution function of crack initiation life of single detail structure. Thus, the probability distribution functions of initiation for cracks occurring in turn in multiple detail structure are obtained. For multiple crack propagation, the stress intensity factor the specified length combination of multiple cracks is calculated the finite element method. The response surface method is introduced functional relationship between crack length and stress intensity factor. The stress intensity factor of the multiple crack arbitrary length combination is obtained from the response surface model. Finally, the crack propagation analysis is performed using the cycle-by-cycle technique. For failure analysis of multiple crack structure, subcritical conditions are to determine the failure. he first crack in the structure is adjacent to the position of the second crackthe crack linkup failure. Crack initiation and propagation specimens with a hole notch and hole notches carried out model. agreement testing results this model.

Key words: multiple site damage, crack initiation life, intersection of incidents, probability distribution, crack propagation life, crack linkup

CLC Number:

V214.4

XI Wei, LI Qiang, SHEN Peiliang, HE Rui, YANG Gang, LIU Shijie. Full life engineering analysis method for multiple site damage[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(5): 524328-524328.

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Full life engineering analysis method for multiple site damage

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