Effect of elastic modulus variation during plastic deformation on uniaxial and multiaxial ratchetting simulations |
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| Authors: | Mohammad Abdel-Karim |
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| Affiliation: | 1. Fatigue & Fracture Group, CSIR-National Metallurgical Laboratory (Council of Scientific & Industrial Research), Jamshedpur 831 007, India;2. Business Development & Monitoring Division, CSIR-National Metallurgical Laboratory (Council of Scientific & Industrial Research), Jamshedpur 831 007, India;3. Structural Characterisation Group, CSIR-National Metallurgical Laboratory (Council of Scientific & Industrial Research), Jamshedpur 831007, India;1. MST Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;2. Metallurgical and Materials Engineering Department, IIT Kharagpur, 721134, India;1. Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, Instituto Balseiro-Universidad Nacional de Cuyo, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Av. Bustillo 9500, 8400 Bariloche RN, Argentina;2. Grupo de Ciencia y Tecnología de los Materiales, Universidad Nacional de Colombia, Sede Medellín, Carrera 80 Número 65-223, Medellín, Colombia;1. CEMUC, Department of Mechanical Engineering, University of Coimbra, Polo II, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra, Portugal;2. CT2M, Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;1. Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0526, USA;2. Department of Mechanical and Production Engineering, Aarhus University, Inge Lehmanns Gade 10, Aarhus C, Denmark;3. U.S. Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA |
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| Abstract: | In order to identify different variables that affect ratchetting simulations, variation of elastic modulus during loading and unloading is considered and discussed based on the experimental observations which pointed out by Morestin and Boivin, 1996, Ishikawa, 1997, Cleveland and Ghosh, 2002, Zhou et al. (2005) and recently by Khan et al., 2009a, Khan et al., 2009b, Khan et al., 2009c. Then the effect of such variation on simulations is scrutinized from the theoretical point of view by considering simulations of ratchetting experiments conducted on stainless steel 304L by Hassan et al. (2008) using the well-known Armstrong–Frederick model. It is shown that, using two different values for the elastic modulus during loading and unloading could have a significant effect on simulations of uniaxial ratchetting. On the other hand, such significant effect hardly occurs in the case of simulations of biaxial ratchetting experiments under consideration. The importance of such findings is that the excessive ratchetting over-prediction resulting from any specific kinematic hardening rule is expected to decrease significantly by taking into consideration this effect. In this case, modeling of kinematic hardening rules could necessitate more attention and reconsideration. |
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