Method for Predicting Crack Initiation Life of Notched Specimen Based on Damage Mechanics

doi:10.1007/s12204-017-1900-y

Abstract

Abstract: Based on the theory of damage mechanics, a method for fatigue crack initiation life prediction of notched components is proposed in this paper. The damage evolution equation of notched specimen under tensioncompression loading is obtained in term of closed-form solution. The crack initiation life of notched specimen is estimated by the proposed method even when material and stress concentration factor are different. It has been verified that the result calculated by the proposed method agrees with the experimental result. The proposed method is concise, effective and feasible to practical application.

Key words: crack initiation life| notch specimen| damage mechanics

摘要： Based on the theory of damage mechanics, a method for fatigue crack initiation life prediction of notched components is proposed in this paper. The damage evolution equation of notched specimen under tensioncompression loading is obtained in term of closed-form solution. The crack initiation life of notched specimen is estimated by the proposed method even when material and stress concentration factor are different. It has been verified that the result calculated by the proposed method agrees with the experimental result. The proposed method is concise, effective and feasible to practical application.

关键词: crack initiation life| notch specimen| damage mechanics

CLC Number:

LIU Jianhui (刘俭辉), WEI Yaobing (韦尧兵), YAN Changfeng (剡昌锋), LANG Shanshan (郎珊珊). Method for Predicting Crack Initiation Life of Notched Specimen Based on Damage Mechanics[J]. Journal of Shanghai Jiao Tong University (Science), 2018, 23(2): 286-290.

References

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