Low-cycle fatigue crack initiation life of hull-notched plate considering short crack effect and accumulative plastic damage |
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| Institution: | 1. Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan 430063, China;2. School of Transportation, Wuhan University of Technology, Wuhan 430063, China;3. Department of Naval Architecture & Ocean and Structural Engineering, Qinzhou University, Qinzhou 535000, China;1. Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, India;2. Material Science and Technology Division, National Metallurgical Laboratory, Jamshedpur 831007, India;3. Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, India;1. Proyecto CAREM, Centro Atómico Bariloche (CNEA), Av. Bustillo 9500, San Carlos de Bariloche 8400, Argentina;2. División Física de Metales, Centro Atómico Bariloche (CNEA)/CONICET, Av. Bustillo 9500, San Carlos de Bariloche 8400, Argentina;3. Grupo Mecánica de Fractura, Universidad Nacional del Comahue/CONICET, Buenos Aires 1400, Neuquén 8300, Argentina;1. Korea University, Department of Mechanical Engineering, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Republic of Korea;2. Structural Integrity & Materials Department, Power Engineering Research Institute, KEPCO-ENC, Kyunggi-do 463-870, Republic of Korea;3. Assessment Technology Group, EDF Energy Barnwood, Gloucester GL4 3RS, UK;1. Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA;2. Savannah River National Laboratory, Aiken, SC, USA;3. Kinectrics Inc., Toronto, ON, Canada |
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| Abstract: | When studying the low-cycle fatigue crack initiation life of notched plates, the effects of fatigue short crack and accumulative plastic damage in the vicinity of the notch should be considered. The low-cycle fatigue crack initiation life of notched plates has been revised in the analysis process by considering the short crack initiation and expansion of notch stress concentration area. By determining the accumulative plastic deformation in the vicinity of a notch under low-cycle fatigue loads, a predictive model of low-cycle fatigue crack initiation life was presented for notched plates, and the relative influence factors were quantitatively analyzed. A comparison study verified that the results obtained from the presented calculation model correlate quite well with those from the existing experiments. Some important conclusions were drawn from the study on considering the effects of short crack and accumulative plastic damage. The presented method may be used for predicting the low-cycle fatigue crack initiation life of ship plate. |
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| Keywords: | Low-cycle fatigue load Notched plate Fatigue short crack Accumulative plastic damage Low-cycle fatigue crack initiation life |
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