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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.1; 20051026-28; Nanjing(CN) >Three-dimensional Transient Analysis of Crack Propagation from a Void in a Thermoelastoviscoplastic Rectangular Plate
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Three-dimensional Transient Analysis of Crack Propagation from a Void in a Thermoelastoviscoplastic Rectangular Plate

机译：弹塑性粘塑性矩形板中空洞裂纹扩展的三维瞬态分析

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摘要

The initiation and propagation of a crack and an adiabatic shear band (ASB) in a homogeneous and isotropic thermoelastoviscoplastic rectangular plate containing a centrally located elliptic void and deformed in tension are analyzed numerically by using 8-node brick elements. An element is assumed to have failed when the damage parameter, defined in terms of the effective plastic strain, effective plastic strain-rate, triaxiality factor and temperature at its centroid equals one; an ASB initiates at a point when the effective plastic strain there equals one. It is found that the ratio, R, of lengths of the two principal axes of the void significantly influences when and where a crack and an ASB initiate and which one initiates first. They usually initiate from a point on the surface of the elliptical void that is also on the midsurface of the plate and propagate initially in the thickness direction. Furthermore, applied strain rates influence the ASB/crack initiation time but not their general locations. An ASB initiates sooner in the 3-D simulations than in the plane strain analysis. An increase in the plate thickness delays the ASB initiation.
机译：通过使用八节点砖单元，对包含中心椭圆形空隙并受拉变形的均质各向同性热弹塑性矩形板中裂纹和绝热剪切带（ASB）的萌生和扩展进行了数值分析。当根据有效塑性应变，有效塑性应变率，三轴因子和质心温度定义的损伤参数等于1时，则认为该元素已失效。当该点的有效塑性应变等于1时，ASB就会启动。已经发现，空隙的两个主轴的长度的比率R显着影响裂纹和ASB何时何地开始以及哪个首先发生。它们通常从椭圆形空隙的表面上的一个点开始，该点也在板的中表面，并且最初在厚度方向上传播。此外，施加的应变速率会影响ASB /裂纹的萌生时间，但不会影响其一般位置。 ASB在3-D模拟中比在平面应变分析中更快地开始。板厚度的增加会延迟ASB的启动。

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