Research on New Model of Long Fatigue Crack Propagation Rates for Structures

LIU Jian-tao; DU Ping-an; HUANG Ming-jing; ZHOU Qing

doi:10.3879/j.issn.1000-0887.2009.05.004

Volume 30 Issue 5

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LIU Jian-tao, DU Ping-an, HUANG Ming-jing, ZHOU Qing. Research on New Model of Long Fatigue Crack Propagation Rates for Structures[J]. Applied Mathematics and Mechanics, 2009, 30(5): 538-546. doi: 10.3879/j.issn.1000-0887.2009.05.004

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Research on New Model of Long Fatigue Crack Propagation Rates for Structures

doi: 10.3879/j.issn.1000-0887.2009.05.004

1.
College of Mechanical and Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China;

Received Date: 2008-11-10
Rev Recd Date: 2009-03-04
Publish Date: 2009-05-15

Abstract

Abstract

By comparison of the characteristics of existing models for long fatigue crack propagation rates, a new model called generalized passivation-lancet model for long fatigue crack propagation rates (GPLFCPR) and the general formula for characterizing the process of crack growth rates were put forward based on the deduction of passivation-lancet theory. The GPLFCPR model overcomes the disadvantages of the existing models and could describe the rules of whole fatigue crack growth process from the cracking threshold to the critical fracturing point effectively with explicit physical meaning and also reflects the influence of material characteristics, such as strength parameters, fracture parameters and heat treatment, etc. Experimental results, testing with LZ50 stell, AlZnMgCu 0.5, 0.5Cr 0.5Mo 0.25V steel and so on, are used to verify the new model, which show great consistency. The GPLFCPR model owns much value for theoretical research and practical applications.
- long fatigue crack,
- threshold,
- cyclic stress ratio,
- fracture roughness,
- propagation model

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References(16)

References

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