Numerical simulation of plasticity induced crack closure: Identification and discussion of parameters

作     者：Antunes, F. V. Rodrigues, D. M. 

作者机构：Univ Coimbra Fac Sci & Technol Dept Mech Engn P-3030788 Coimbra Portugal 

出 版 物：《ENGINEERING FRACTURE MECHANICS》 (工程断裂力学)

年 卷 期：2008年第75卷第10期

页      面：3101-3120页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

主　　题：plasticity induced crack closure finite element analysis middle-crack tension specimen elastic-plastic material behaviour numerical parameters 

摘      要：Numerical studies play a major role in the understanding and prediction of plasticity induced crack closure (PICC). However, the available numerical models can be considered simplifications of reality as they consider discrete crack propagations, relatively high fatigue crack growth rates (FCGR), sharp cracks, and propagation occurring at well-defined loads. Besides, there are a great number of numerical and physical parameters affecting the predictions of PICC. The aim of this paper is to discuss the numerical study of PICC. The numerical parameters affecting the accuracy of the numerical simulations, and the dependent parameters used to characterise the plastic wake and the closure level, are identified. The influence of the radial size of crack front elements and crack propagation is analysed. Ail extrapolation model is proposed, with excellent results. An intrinsic uncertainty is associated with the number of load cycles between crack increments and the definition of crack closure level. Finally, the effect of the stress ratio (R) oil crack closure level is analysed. (c) 2007 Elsevier Ltd. All rights reserved.