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Applied Mathematics and Mechanics (English Edition) ›› 2009, Vol. 30 ›› Issue (5): 575-584.doi: https://doi.org/10.1007/s10483-009-0504-y

• Articles • 上一篇    下一篇

New model of propagation rates of long crack due to structure fatigue

刘建涛1 杜平安1 黄明镜2 周晴1   

  1. 1. College of Mechanical and Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China;
    2. China Gas Turbine Establishment, Jiangyou 621703, Sichun Province, P. R. China
  • 收稿日期:2008-11-10 修回日期:2009-03-04 出版日期:2009-05-01 发布日期:2009-05-01

New model of propagation rates of long crack due to structure fatigue

Jian-Tao LIU1, Ping-An DU1, Ming-Jing HUANG2, Qing ZHOU1   

  1. 1. College of Mechanical and Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China;
    2. China Gas Turbine Establishment, Jiangyou 621703, Sichun Province, P. R. China
  • Received:2008-11-10 Revised:2009-03-04 Online:2009-05-01 Published:2009-05-01

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摘要： By comparison of the characteristics of existing models for long fatigue crack propagation rates, a new model, called the generalized passivation-lancet model for long fatigue crack propagation rates (GPLFCPR), and a general formula for characterizing the process of crack growth rates are proposed based on the passivation-lancet theory. The GPLFCPR model overcomes disadvantages of the existing models and can describe the rules of the entire fatigue crack growth process from the cracking threshold to the critical fracturing point effectively with explicit physical meaning. It also reflects the influence of material characteristics, such as strength parameters, fracture parameters and heat treatment. Experimental results obtained by testing LZ50 steel, AlZnMgCu0.5, 0.5Cr0.5Mo0.25V steel, etc., show good consistency with the new model. The GPLFCPR model is valuable in theoretical research and practical applications.

关键词: long fatigue crack, threshold, cyclic stress ratio, fracture roughness, propagation model

Abstract: By comparison of the characteristics of existing models for long fatigue crack propagation rates, a new model, called the generalized passivation-lancet model for long fatigue crack propagation rates (GPLFCPR), and a general formula for characterizing the process of crack growth rates are proposed based on the passivation-lancet theory. The GPLFCPR model overcomes disadvantages of the existing models and can describe the rules of the entire fatigue crack growth process from the cracking threshold to the critical fracturing point effectively with explicit physical meaning. It also reflects the influence of material characteristics, such as strength parameters, fracture parameters and heat treatment. Experimental results obtained by testing LZ50 steel, AlZnMgCu0.5, 0.5Cr0.5Mo0.25V steel, etc., show good consistency with the new model. The GPLFCPR model is valuable in theoretical research and practical applications.

Key words: long fatigue crack, threshold, cyclic stress ratio, fracture roughness, propagation model

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