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《Chinese Journal of Applied Mechanics》 2013-03
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A modification of irving formula

Yang Dapeng 1 Wang Peixian 1 Liu Xiang 2(1 Machine Department,Zhengzhou Technical College,450121,Zhengzhou,China;2 Department of Mechanical Engineering,Wuhan Polytechnic University,430023,Wuhan,China)  
In this article,corresponding computational formulas of fatigue crack propagation rate have been deduced on the basis of analyzing several empirical formula of fatigue crack propagation rate,considering the effect of fatigue load with diverse stress ratios and frequencies on straight and curve crack propagation rate.The correctness of new formulas have been validated,comparing with empirical formulas and existing experimental data,the results can be applied to forecasting crack propagation rate under fatigue loads with diverse stress ratios and frequencies.Under the condition of the same amplitude of varying stress intensity factor,fatigue crack propagation rate increases when stress ratio and frequency of fatigue loads increase,and it increases by inches in the first phase,very rapidly in the second and the third phases.There universally exist fatigue loads in shipping and ocean structures.Stress ratio and frequency of different fatigue loads are usually different,therefore it is very necessary to study the rule of the effect of different stress ratios and frequencies on structure crack propagation rate.The new Irving formulas provided by this article is applicable to the first,the second and the third phases of linear elasticity straight and curve crack propagation process under fatigue loads.The calculated results via the new Irving formulas are closer to experimental data than the originals.The new Irving formulas are more practicable and accurate than ever before.
【Fund】: 河南省教育厅科学技术研究重点项目(2012B130007)
【CateGory Index】: TH123.4
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