Linear matching method for creep rupture assessment |
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| Affiliation: | 1. Department of Economics, Engineering, Society and Business Organization, University of Tuscia, Largo dell’Università, 01100 Viterbo, Italy;2. Department of Enterprise Engineering - University of Rome Tor Vergata, Via del Politecnico, 1, 00133, Rome, Italy;3. Department of Engineering, University of Naples Parthenope, Isola C4 Centro Direzionale, 80133 Napoli, Italy;1. Institute of Structural Mechanics, TU Darmstadt, Franziska-Braun-Straβe 7, 64287 Darmstadt, Germany;1. Scientific Research Center “StaDyO”, office 810, 8 floor, 18, 3-rd Yamskogo Polya Street, Moscow, 125040, Russia;2. Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences, 21 Lokomotivniy Proezd, Moscow, 127238, Russia;3. Russian Academy of Architecture and Construction Sciences, 24, Bolshaya Dmitrovka Street, Moscow, 107031, Russia;4. National Research Moscow State University of Civil Engineering, 26, Yaroslavskoe Shosse, Moscow, 129337, Russia |
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| Abstract: | The recently developed linear matching method (LMM), which is easily implemented within commercial FE codes, has been successfully used to evaluate elastic and plastic shakedown loads. In this paper, the method is extended to the prediction of the creep rupture life of a structure, based upon a bounding method currently used in the life assessment method R5. The method corresponds to the requirement that, for the operating load history, the structure should shakedown where the yield stress is given by the lesser of the plastic yield stress and a high temperature rupture stress corresponding to a rupture time. A holed plate subjected to cyclic thermal load and constant mechanical load is assessed in detail as a typical example to confirm the applicability of the above procedures. The examples show that the method remains numerically stable, even when the method is inverted. |
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