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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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【Citations】
Chinese Journal Full-text Database 5 Hits
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【Co-citations】
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1 TANG He-sheng;LI Da-wei;SU Yu;ZHAO Jin-hai;State Key Laboratory of Disaster Prevention in Civil Engineering,Tongji Univ;Research Institute of Structural Engineering and Disaster Reduction,Tongji Univ;;Prediction of the Yield Performance of RC Columns by Neural Network[J];湖南大学学报(自然科学版);2015-11
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3 Xue Jibin;Lv Yafei;Qi Shicheng;Jiang Shengling;Zhang Xiaoa;Yun Rongping;Key laboratory of Carbon Fiber and Functional Polymers,Ministry of Education;Dongcheng Administration of Work Safety;Research Institute for Science & Technology Development,Beijing University of Chemical Technology;;Evaluation and Prediction on Tribological Performances of Brake Friction Materials Based on Artificial Neural Networks[J];润滑与密封;2014-11
4 YANG Dapeng;ZHANG Xueyan;ZHAO Yao;Mechanical Engineering Department,Zhengzhou Technical College;College of Naval Architecture & Ocean Engineering,Huazhong University of Science and Technology;Electric and Electron Engineering Department,Zhengzhou Technical College;;Research on plastic zone of slightly curved elastoplastic crack under dynamicloads[J];武汉大学学报(工学版);2014-03
5 CHEN Jiping;DING Zhiping;ZENG Jun;BAI Xiaopeng;WANG Weifeng;School of Mechanical Engineering, Hunan University of Technology;;Study on Low Cycle Fatigue of Ni-based Single Crystal Alloy under Multi-axial Non-proportional Loading Based on Grey Theory[J];机械工程学报;2014-24
6 YANG Dapeng;ZHAO Hui;ZHAO Yao;Mechanical Engineering Department,Zheng Zhou Technical College;School of Naval Architecture & Ocean Engineering,Huazhong University of Science and Technology;;Study on Fatigue Curve Crack Growth Behaviors of Cr-Mo Steel in Hydrogen Eroding Environment[J];武汉理工大学学报(交通科学与工程版);2014-02
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9 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);A modification of irving formula[J];应用力学学报;2013-03
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