Modeling stress development during the solidification of gray iron castings
Modeling stress development during the solidification of gray iron castings
复制标题
模拟灰铁铸件凝固过程中的应力发展
DOI：
10.1007/bf02782429
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
J. Dantzig
中科院分区：
文献类型：
--
作者：
J. W. Wiese;J. Dantzig
已经开发出一种预测灰铁铸造铸件应力发展的方法。基于 Frishmuth 和 McLaughlin 9 的理论发展以及 Coffin 10 的实验，新的屈服函数在商业有限元包中作为用户编写的元素实现。屈服函数考虑了铸铁屈服应力对加载路径的强烈依赖性。在弹粘塑性应力分析中使用新的屈服函数计算冷却铸件中热位移产生的应力。在早期的工作中，开发了通过零件表面上的边界条件集来表示热分析中的模具的技术。在这项工作中，第二个用户编写的元素用于在铸件表面应用力-位移边界条件，以表示模具的机械约束。该元素的属性基于土壤力学考虑。给出的示例问题显示，与使用更常见的 von Mises 屈服函数获得的结果相比，使用本公式计算的应力存在显着差异。
A method has been developed to predict stress development in gray iron foundry castings. A new yield function, based on theoretical developments by Frishmuth and McLaughlin,9 and on experiments by Coffin10 was implemented as a user-written element in a commercial finite element package. The yield function takes into account the strong dependence of the yield stress in cast irons on the loading path. Stresses resulting from thermal displacements in the cooling casting are computed using the new yield function in an elastic-viscoplastic stress analysis. In earlier work, techniques were developed to represent the mold in the thermal analysis by sets of boundary conditions on the surface of the part. For this work, a second user-written element was used to apply force-displacement boundary conditions on the surface of the casting to represent the mechanical constraint of the mold. The properties for this element were based on soil mechanics considerations. Example problems are given, showing a substantial difference in the computed stresses when using the present formulation, in comparison to results obtained with the more usual von Mises yield function.