Limit loads and fracture mechanics parameters for thick-walled pipes |
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Authors: | Nak-Hyun Kim Chang-Sik Oh Yun-Jae Kim Jong-Sung Kim Dong Wook Jerng Peter J Budden |
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Affiliation: | 1. Korea University, Department of Mechanical Engineering, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Republic of Korea;2. Department of Mechanical Engineering, Sunchon National University, Sunchon, Jeonnam 540-742, Republic of Korea;3. Nuclear Engineering & Technology Institute, Korea Hydro & Nuclear Power, Yuseong-gu, Daejeon 305-343, Republic of Korea;4. Assessment Technology Group, EDF Energy, Barnwood, Gloucester GL4 3RS, UK |
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Abstract: | In this paper, information on plastic limit loads and both elastic and elastic-plastic fracture mechanics parameters is given for cracked thick-walled pipes with mean radius-to-thickness ratios ranging from two to five. It is found that existing limit load expressions for thin-walled pipes can be applied to thick-walled pipes, provided that they are normalized with respect to the corresponding un-cracked thick-walled pipe values. For elastic fracture mechanics parameters, FE values of the influence functions for the stress intensity factor and the crack opening displacement are tabulated. For elastic-plastic J, it is shown that existing reference stress based J estimates can be applied, provided that a proper limit load for thick-walled pipes is used. |
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Keywords: | Crack opening displacement J-integral estimates Limit load Stress intensity factor Thick-walled pipe |
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