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首页> 外文期刊>International Journal of Solids and Structures >Effect of T-stress and loading rate on crack initiation in rate sensitive plastic materials
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Effect of T-stress and loading rate on crack initiation in rate sensitive plastic materials

机译：T应力和加载速率对速率敏感塑料材料中裂纹萌生的影响

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The objectives of this paper are to examine the validity of a two-parameter (J Q) characterization of quasi-static crack tip fields in rate sensitive plastic solids and. also to investigate the influence of strain rate sensitivity of the material on the variation of fracture toughness with loading rate. To this end, 2D plane strain finite element analyses of a boundary layer model loaded quasi-statically and a single edge notched (tensile) specimen under dynamic loading are performed. The material is assumed to obey a J(2) viscoplasticity model and a small strain formulation is employed. The results demonstrate that a valid J-Q field exists in love to moderately rate sensitive materials under quasi-static loading (i.e., when inertial effects are neglected). The opposing effects of strain rate sensitivity and material inertia are reflected in the stress field ahead of the tip in the dynamically loaded specimen. The variation of fracture toughness K-dc with loading rate (K) over dot for cleavage cracking is predicted using a simple critical stress criterion. It is found that strain rate sensitivity index of the material has a profound effect on the K-dc-(K) over dot variation. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 35]
机译：本文的目的是检验速率敏感塑料固体中准静态裂纹尖端场的两参数（J Q）表征的有效性。还研究了材料的应变率敏感性对断裂韧性随载荷率变化的影响。为此，对准静态加载的边界层模型和动态加载下的单边缺口（拉伸）试样进行了二维平面应变有限元分析。假定该材料服从J（2）粘塑性模型，并采用小应变公式。结果表明，在准静态载荷下（即当忽略惯性效应时），存在一个有效的J-Q场，可以适度地对敏感材料进行评级。应变速率敏感性和材料惯性的相反影响反映在动态加载样本中尖端前方的应力场中。使用简单的临界应力准则预测断裂韧性K-dc随点的开裂速率而变化。发现材料的应变速率敏感性指数对K-dc-（K）的点变化具有深远的影响。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：35]

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