FRACTURE PREDICTION IN PLASTIC-DEFORMATION PROCESSES
FRACTURE PREDICTION IN PLASTIC-DEFORMATION PROCESSES
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DOI：
10.1016/0020-7403(90)90148-c
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发表时间：
1990-01-01
影响因子：
7.3
通讯作者：
ROWE, GW
中科院分区：
文献类型：
--
作者：
CLIFT, SE;HARTLEY, P;ROWE, GW
本文介绍了使用有限元技术来预测在一系列简单的金属成形操作的断裂起始。这些涵盖了典型的过程，并使变形和断裂的启动，以检查在几个不同的负载条件下。三种类型的金属成形操作被认为是简单的镦粗，轴对称挤压，带压缩和拉伸。利用编制的塑性成形分析程序，确定了局部应力和应变分布。这些值，然后使用先前公布的连续断裂准则来预测断裂起始部位。这样得到的预测随后与实验观察进行了比较。只有一个标准已经成功地预测了断裂起始点实验发现在本文中检查的所有操作：广义塑性功每单位体积的临界值。这个标准也被用来预测断裂发生时的实验变形水平，但只有部分成功。
This paper describes the use of the finite-element technique to predict fracture initiation in a range of simple metalforming operations. These cover typical processes and enable deformation and fracture initiation to be examined under several different loading conditions. Three types of metalforming operation are considered, simple upsetting, axisymmetric extrusion, and strip compression and tension. Using a program developed to deal with metalforming analysis, the local stress and strain distributions are determined. These values are then used with previously published continuum fracture criteria to predict fracture initiation sites. The predictions so obtained are subsequently compared with experimental observations. Only one criterion has successfully predicted the fracture initiation site found experimentally in all the operations examined in this paper: that of a critical value of generalized plastic work per unit volume. This criterion was also used to predict the level of experimental deformation at which fracture should occur, but only with partial success.