Modelling Elastoplastic Deformations in Grey Cast Iron
Modelling Elastoplastic Deformations in Grey Cast Iron
复制标题
模拟灰口铸铁的弹塑性变形
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
H. E. Hjelm
中科院分区：
文献类型：
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作者：
B. Josefson;H. E. Hjelm
研究了灰铸铁的弹塑性变形。三种不同的唯象本构模型用于FE代码进行了比较。最终选择的本构模型采用两个屈服函数，它可以处理在压缩和拉伸和可能的（拉伸）塑性体积增加观察到的不同的屈服强度。通过两个算例验证了本构模型的有效性。一个处理一个简单的双轴加载循环，另一个处理柴油机气缸盖底板的一部分的行为。该板由热梯度、来自燃烧室的气体压力、预应力螺栓和来自阀座的收缩压力加载。
Elasto-plastic deformation of grey cast iron is studied. Three different phenomenologically based constitutive models for use in FE-codes are compared. The constitutive model finally selected employs two yield functions and it can handle both the different yield strengths observed in compression and tension and a possible (tensile) plastic volume increase. The capacity of the constitutive models are demonstrated in two numerical examples. One treats a simple bi-axial loading cycle, and the other the behaviour of a part of the bottom plate of a cylinder head in a Diesel engine. This plate is loaded by thermal gradients, a gas pressure from the combustion chamber, prestressed boltings and shrink pressures from a valve seat.