Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part IV: Assessment of the yield surface after plastic loading

Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part IV: Assessment of the yield surface after plastic loading
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片状灰铸铁微观结构相关塑性的计算评估 â 第四部分:塑性加载后屈服面的评估

DOI:
10.1016/j.ijsolstr.2018.02.020
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发表时间:
2018
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

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本文对最近提出的灰铸铁材料GJL-250的基于微观组织的体积元在不同的塑性加载历史后的屈服面进行了评估。屈服面的演变进行了研究,不同的体积,偏载和单轴载荷。金属基体和石墨夹杂物的细观力学性能通过实验应力-应变滞回线进行了验证。金属基体被建模为具有非线性随动硬化规律的弹塑性。石墨夹杂物描述的体积应变状态依赖的杨氏模量的装置。结果表明,在纯偏载作用下,屈服面的形状与初始屈服面相比没有明显变化。在体积加载后,材料对矿脉角的依赖性显著降低。单轴拉伸预加载导致变形的屈服面,由此变形的大小取决于所施加的载荷。单轴压缩预加载不改变初始屈服面的形状。
In this paper the yield surface of a recently presented microstructure-based volume element of the gray cast iron material GJL-250 is assessed after different plastic loading histories. The evolution of the yield surface is investigated for different volumetric, deviatoric and uniaxial loadings. The micromechanical material properties of the metallic matrix and the graphite inclusions are validated by means experimental stress-strain hysteresis loops. The metallic matrix is modeled as elastic-plastic with a non-linear kinematic hardening law. The graphite inclusions are described by means of a volumetric strain state dependent Young’s modulus. The results show that the shape of the yield surface does not change significantly in comparison to the initial yield surface after pure deviatoric loadings. After volumetric loadings, the dependence of the material on the Lode angle is significantly reduced. Uniaxial tensile preloadings result in a deformed yield surface, whereby the magnitude of the deformation depends on the applied load. Uniaxial preloadings to compression do not change the shape of the initial yield surface.
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