Integrity assessment for a tubeplate using the linear matching method |
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| Affiliation: | 1. Aerospace Engineering, University of Bristol, BS8 1TR Bristol, UK;2. Department of Aeronautics, Imperial College London, London SW7 2AZ, UK;3. Dynamics and Control Research Group, University of Bristol, BS8 1TR Bristol, UK;4. Mechanical Methods, Rolls-Royce plc, PO Box 31, DE24 8BJ Derby, UK;1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;1. Dept. of Ocean Engineering, Zhejiang Univ., 866 Yuhangtang Rd., Hangzhou, Zhejiang Province 310058, PR China;2. Department of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, G15AE, UK;1. School of Aerospace Engineering, Tsinghua University, Beijing 100084, PR China;2. Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow G1 1XJ, UK |
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| Abstract: | A series of numerical procedures have been presented recently for the integrity assessment of structures based upon the Linear Matching Method. A typical example of a holed plate has been used to verify these procedures for the evaluation of plastic and creep behaviours of components. In this paper, a more complex 2D tubeplate at the outlet from a typical AGR heat exchanger is analysed for the shakedown limit, reverse plasticity, ratchet limit and creep relaxation based on the application of the Linear Matching Method for a thorough case study. Both a constant material yield stress and a temperature-dependent yield stress are adopted for the evaluation of the ratchet limit. For the evaluation of accumulated creep strains, flow stresses and elastic follow-up factors with differing dwell times at the steady cyclic state, a monotonic creep computation is performed, where the start-of-dwell stress is the rapid cycle creep solution at the beginning of the dwell period. An estimation of the tubeplate lifetime is then obtained by the evaluation of fatigue and creep endurances. |
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