Effects of the transverse stress on biaxial fatigue crack growth predicted by plasticity-corrected stress intensity factor |
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| Affiliation: | 1. Center of Advanced Study, Department of Metallurgical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, UP, India;2. Mechanical Metallurgy Group, Bhabha Atomic Research Center, Trombay 400085, Mumbai, India;3. Nuclear Fuel Complex, Hyderabad 500062, India;1. Department of Mining Engineering, Isfahan University of Technology, Isfahan, 8415683111, Iran;2. Scholarship of Tishreen university, Latakia, Syria;1. Centro de Investigaciones de Mecánica Teórica y Aplicada, Universidad Tecnológica Nacional FRBB, 11 de Abril 461, B8000LMI Bahía Blanca, Argentina;2. Universidad de las Fuerzas Armadas-ESPE, Departamento de Ciencias de la Energía y Mecánica, Avda Rumiñahui S/N, Sangolqui, Pichincha, Ecuador;1. Material Science Research and Development, Timken World Headquarters, North Canton, OH 44720, USA;2. Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA;3. Department of Integrated Systems Engineering, The Ohio State University, Columbus, OH 43210, USA |
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| Abstract: | The transverse stress has an important effect on the biaxial fatigue crack behavior. However, the experimental evidence has provided conflicting indications: it is sometimes considered to increase, decrease or have no effect. These complex phenomena cannot be rationally explained by the existing mechanical models. The effect of the transverse stress on the fatigue crack growth behavior is still one of the most puzzling questions in biaxial fatigue. Physically, this effect is a transverse stress induced plasticity phenomenon. In this paper, a plasticity-corrected stress intensity factor (PC-SIF) is proposed to describe the effect of transverse stress on biaxial fatigue. By use of this new crack driving force some important phenomena associated with transverse stress are predicted. Comparisons with experimental results showed that the PC-SIF as an effective mechanical parameter is capable of predicting the effects of the crack length, the stress level, cyclic stress ratio, biaxial stress ratio and phase difference on the biaxial fatigue crack growth. Consequently, the alleged conflicting experimental results have been rationally explained by the PC-SIF. |
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| Keywords: | Biaxial fatigue Transverse stress Fatigue crack growth Plastic zone Stress intensity factor |
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