Multi-strain path deformation behavior of AA6016-T4: Experiments and crystal plasticity modeling
Multi-strain path deformation behavior of AA6016-T4: Experiments and crystal plasticity modeling
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AA6016-T4 的多应变路径变形行为：实验和晶体塑性建模
DOI：
10.1016/j.ijsolstr.2022.111536
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发表时间：
2022
影响因子：
3.6
通讯作者：
Fullwood, David T.
中科院分区：
文献类型：
--
作者：
Sharma, Rishabh;Sargeant, Dane;Daroju, Sowmya;Knezevic, Marko;Miles, Michael P.;Fullwood, David T.
板材成形时应变路径改变时产生的背应力的发展使得回弹后的最终零件几何预测很难使用传统模型。大多数变形模型没有明确考虑这些应力的影响。最近发展的弹塑性自洽(EPSC)模型引入了背应力来影响滑移系统的激活，以便更准确地模拟复杂材料的响应。目前的研究评估了EPSC模型对AA6016-T4通过多个双轴、平面应变和单轴拉伸应变路径的变形响应的性能。通过首先在单轴、双轴和平面应变拉伸下进行预应变，然后在单轴拉伸下加载来检查对复杂应变路径的响应。EPSC模型的预测结果与实验结果非常吻合。该模型正确地预测了单轴拉伸在初始单轴预应变后的最高屈服应力和从弹性变形到塑性变形的最大转变。在双向拉伸和平面应变拉伸中，第一次预应变后的单轴拉伸的屈服应力也得到了正确的预测，并且从弹性行为到塑性行为的过渡更加平稳。用高分辨电子背散射衍射(HREBSD)观察到了几何必要位错(GND)随应变的线性发展，而用该模型预测了二次统计储存位错(SSD)的发展。比较表明，在较高应变下，从运动型硬化到各向同性硬化的转变是预期的。最后，在较高应变水平下，在所有预应变情况下，背应力约占随后总流动应力的15%。
The development of backstresses that occur during a strain path change when forming sheet metal renders final part geometry prediction, after springback, difficult using conventional models. Most deformation models do not explicitly account for the influence of these stresses. A more recently developed elasto-plastic self-consistent (EPSC) model incorporates the backstresses to influence the activation of slip systems for more accurate simulations of the complex material response. The current study assesses the performance of the EPSC model for deformation response of AA6016-T4 via multiple biaxial, plane-strain, and uniaxial tension strain paths. The response to complex strain paths was examined by first pre-straining under uniaxial, biaxial, and plane-strain tension, then by loading in uniaxial tension. The EPSC model predictions closely matched experimental results. The model correctly predicted the highest yield stress and sharpest transition from elastic to plastic deformation for uniaxial tension after an initial uniaxial pre-strain. Lower yield stress for uniaxial tension after first pre-straining in biaxial and plane-strain tension is also correctly predicted, along with a smoother transition from elastic to plastic behavior. A linear geometrically necessary dislocation (GND) development, with strain, was observed using high-resolution electron backscattered diffraction (HREBSD) while a quadratic statistically stored dislocation (SSD) development was predicted by the model. The comparison revealed an expected transition from kinematic to isotropic hardening at higher strains. Finally, at higher strain levels the backstress accounted for around 15% of the total subsequent flow stress in all pre-strain cases.
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作者：
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通讯作者：
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影响因子：
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DOI：
10.1016/j.ijsolstr.2019.02.024
发表时间：
2020-02-01
影响因子：
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