Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part II: initial yield surfaces and directions

Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part II: initial yield surfaces and directions
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片状灰铸铁微观结构相关塑性的计算评估第二部分:初始屈服面和方向

DOI:
10.1016/j.ijsolstr.2015.04.014
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发表时间:
2015
影响因子:
3.6
通讯作者:
T. Seifert
T. Seifert
中科院分区:
工程技术2区
文献类型:
--
作者:
M. Metzger;T. Seifert

文献摘要

参考文献

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本文采用有限元方法对三种不同含片状石墨夹杂物的灰铸铁材料的初始多轴屈服行为进行了数值研究。因此,包括材料的真实的微观结构的体积元素被加载双轴和三轴超过宏观屈服。所获得的屈服面的形状进行比较的四个连续模型,其中,在文献中提出的灰铸铁与层状石墨夹杂物的非弹性行为的表面。结果发现,所提出的连续模型和宏观屈服面与微观结构为基础的有限元模型偏离。此外,初始非弹性流动方向计算在宏观屈服的发病。分析表明,非弹性流动垂直于屈服面。
In this paper, the initial multiaxial yield behavior of three different gray cast iron materials with lamellar shaped graphite inclusions is numerically investigated by means of the finite-element method. Therefore, volume elements including the real microstructure of the materials are loaded bi- and triaxially beyond macroscopic yield. The shape of the obtained yield surfaces are compared to the surfaces of four continuum models which, amongst others, are proposed in literature to describe the inelastic behavior of gray cast iron with lamellar shaped graphite inclusions. It is found that the presented continuum models and the macroscopic yield surfaces obtained with microstructure-based finite-element models deviate. Furthermore, the initial inelastic flow direction is computed at the onset of macroscopic yielding. The analysis show that the inelastic flow is normal to the yield surface.
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