Analysis of Essential Work of Rupture using Non-local Damage-plasticity Modelling
Analysis of Essential Work of Rupture using Non-local Damage-plasticity Modelling
复制标题
使用非局部损伤塑性模型分析断裂的基本功
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
G. Houlsby
中科院分区：
文献类型：
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作者：
A. Korsunsky;G. Nguyen;G. Houlsby
我们考虑基本断裂功(EWR)的非局部损伤塑性模拟，即在试件内部引起破坏所需的比能量，从而导致试件分离成两部分。更常见的基本断裂功(EWF)概念是一种测量单位横截面面积上裂纹扩展穿过一系列双边缺口拉伸(凹陷)试件时所消耗的比能量。最近，有人提出了一种新的框架，允许确定相关的量，即从延性金属的无缺口狗骨试件上进行单次拉伸试验所需的颈缩和撕裂工作。同时多规格长度延伸法是实验方法的重要组成部分，可以捕捉应变局部化、临界后变形行为、损伤非局部性、弹性回弹和尺寸效应等现象。在本研究中，断裂试验采用有限元的非局部损伤-塑性模型进行模拟。根据断裂的基本功和非基本功来解释结果。
We consider the non-local damage plasticity modelling of the essential work of rupture (EWR), i.e. the specific energy required to cause failure within a specimen, resulting in its separation into two parts. The more usual concept of essential work of fracture (EWF) is a measure of the specific energy, per unit cross sectional area, consumed during the propagation of cracks across a series of double edge-notched tensile (DENT) specimens. Recently, a novel framework has been proposed allowing the determination of a related quantity, the essential work of necking and tearing from a single tensile test on an unnotched dogbone specimen of ductile metal. Simultaneous multiple gauge length extensometry forms a crucial component of the experimental approach, and allows capture of such phenomena as strain localisation, post-critical deformation behaviour, damage non-locality, elastic snap-back, and size effects. In this study the rupture test is simulated using a non-local damage-plasticity model using finite elements. The results are interpreted in terms of essential and non-essential work of rupture.