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首页> 外文期刊>International Journal of Plasticity >A modified yield function for modeling of the evolving yielding behavior and micro-mechanism in biaxial deformation of sheet metals
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A modified yield function for modeling of the evolving yielding behavior and micro-mechanism in biaxial deformation of sheet metals

机译：一种改进的产量函数，用于建模薄片金属双轴变形中的演化产量及微机制

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In-depth understanding of the evolving plastic yielding behaviors and insight into their microscaled mechanisms are critical for fully exploiting of the formability of sheet metals, accurately forming of the needed shape and geometries, and precisely tailoring of the needed quality and property of the deformed parts. In this research, the in-plane yielding behaviors of dual-phase steel and aluminum alloy sheets were extensively investigated by biaxial tension experiments with the original and pre-strained specimens. It is found that the profile of the experimental plastic work contours changes with the increase of plastic deformation, no matter what the proportional or complex loading condition is. This indicates that the evolving yield behavior cannot be neglected. Based on the Yld2000-2d yield function, a modified yield function with introducing a variable exponent to represent the evolving yield behavior was proposed and then employed to model the evolving yielding of the given metallic sheets. To investigate the yielding micro-mechanisms, the simulated biaxial tension tests were conducted by using the established representative volume elements (RVEs) with a crystal plasticity model. The simulation results showed that the texture of the given sheet metals has a significant effect on the profile of the yield loci. Moreover, when the hard secondary phase is added into the polycrystalline aggregate, the optimum exponent of yield function for the given RVEs is increased, instead of decrease within a certain range of the plastic strain. The micro-mechanism of the evolving yielding behavior could be attributed to the 'pinning' effect of hard inclusions to the polycrystalline grains, i.e. the hardlydeformable particles strengthening the kinetic constraints to the polycrystalline matrix and further obstructing the rotation and plastic deformation of the neighboring grains. This research thus provides a comprehensive understanding of the effect of microscopic structure (crystal structure, texture and secondary hard phase) on the macroscopic plastic yielding behavior of metallic materials as well as a new high-fidelity modelling technique to describe the evolving yielding behavior phenomenologically, in such a way to support the application of FE simulation in sheet metal forming processes.
机译：深入了解改进的塑料产生行为和洞察的微观机构对于充分利用片状金属的可成形性，精确地形成所需的形状和几何形状，以及精确地裁缝变形部件的所需质量和性质的关键。在该研究中，通过双轴张力试验与原始和预束性标本进行了广泛研究了双相钢和铝合金片的平面屈服行为。结果发现实验塑料工作轮廓的轮廓随着塑性变形的增加而变化，无论成比例或复合的负载条件如何。这表明不忽视不断发展的产量行为。基于YLD2000-2D产量功能，提出了一种改进的屈服函数，其引入可变指数以表示不断变化的产量行为，然后采用来模拟给定金属片的不断的屈服。为了研究产量微机制，通过使用具有晶体塑性模型的所建立的代表体积元素（rves）进行模拟的双轴张力试验。仿真结果表明，给定板材金属的质地对产量基因座的轮廓具有显着影响。此外，当将硬晶相加入到多晶聚集体中时，给定圆瓦的屈服函数的最佳指数增加，而不是在塑料应变的一定范围内降低。演化产量行为的微机制可归因于“钉纳”对多晶粒的粘附效果，即硬晶粒强化对多晶矩阵的动力学约束并进一步阻碍邻近颗粒的旋转和塑性变形。因此，该研究提供了对微观结构（晶体结构，纹理和次级硬相）对金属材料的宏观塑性产生行为的宏观结构以及新的高保真建模技术的综合了解，以描述现象学的演化产生行为，以一种支持FE模拟在金属板形成过程中的应用的方法。

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