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rsdm:A Powerful Direct Method to Predict the Asymptotic Cyclic Behavior of Elastoplastic Structures

Chinese Journal of Mechanical Engineering 2021年第6期34卷 21-38页

作者： Konstantinos V.Spiliopoulos Ioannis A.Kapogiannis Institute of Structural Analysis and Antiseismic Research Department of Civil EngineeringNational Technical University of AthensZografou Campus157-80 AthensGreece

Mechanical engineering structures and structural components are often subjected to cyclic thermomechanical loading which stresses their material beyond its elastic limits well inside the inelastic *** on the level of loading inelastic strains may lead either to failure,due to low cycle fatigue or ratcheting,or to safety,through elastic ***,it is important to estimate the asymptotic stress state of such *** state may be determined by cumbersome incremental time-stepping *** methods,alternatively,have big computational advantages as they focus on the characteristics of these states and try to establish them,in a direct way,right from the beginning of the *** the very few such general-purpose direct methods,a powerful direct method which has been called rsdm has appeared in the *** method may directly predict any asymptotic state when the exact time history of the loading is *** advantage of the method is due to the fact that it addresses the physics of the asymptotic cycle and exploits the cyclic nature of its expected residual stress *** on rsdm a method for the shakedown analysis of structures,called rsdm-S has also been *** most direct methods for shakedown,rsdm-S does not need an optimization algorithm for its *** rsdm and rsdm-S may be implemented in any Finite Element Code.A thorough review of both these methods,together with examples of implementation are presented herein.

关键词： Direct methods rsdm rsdm-S Shakedown Alternating plasticity Ratcheting

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