Material modeling and simulation of continuous-bending-under-tension of AA6022-T4
Material modeling and simulation of continuous-bending-under-tension of AA6022-T4
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AA6022-T4 材料建模与连续拉伸弯曲仿真
DOI：
10.1016/j.jmatprotec.2020.116658
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发表时间：
2021
影响因子：
6.3
通讯作者：
Korkolis, Yannis P.
中科院分区：
文献类型：
--
作者：
Barrett, Timothy J.;Takagi, Shuhei;Islam, Nazrul;Kuwabara, Toshihiko;Hassan, Tasnim;Kinsey, Brad L.;Knezevic, Marko;Korkolis, Yannis P.
在早期的文章中，我们讨论了AA6022-T4的连续拉伸弯曲（CBT）实验。我们发现CBT显著提高了单轴拉伸的断裂伸长率和强度。在本文中，我们对CBT的理解超越了这些实验观察，借助材料建模和过程的数值模拟。在这种材料上进行了循环拉伸压缩实验，使用应变历史来复制CBT期间的加载，即恒定应变幅值和线性增加平均值的不同组合，直至失效。在这些实验中，发现了有限但不可忽略的运动硬化。其中一些实验用于校准组合各向同性-运动学硬化模型，而其余的用于模型的实验验证。建模框架是基于速率无关的，相关的流动规则与冯米塞斯屈服准则作为塑性势。各向同性硬化是通过塑性变形下屈服面增长的简单指数衰减模型引入的。非线性运动硬化是由一个四项的chaboche型模型引入的。通过外推法确定大应变硬化曲线，该方法在稍后的工作中得到验证，并与其他选择进行对比。该材料建模框架被引入到CBT过程的有限元模型中。该模型采用线性简化积分单元进行网格划分，通过厚度划分为7个单元。结果表明，该模型能很好地再现实验力-位移曲线，包括CBT典型的尖峰和高原的连续变化。该模型还复制了CBT过程中表面应变的发展，并与测试后的应变测量结果相比较。在这些验证之后，该模型被用于探索CBT过程的机制，例如，应力和应变通过厚度和每个周期的发展，破坏的位置和开始，以及破坏角，在CBT中不同于在典型的单轴拉伸实验中发现的局部颈部角。
In earlier contributions, we discussed continuous-bending-under-tension (CBT) experiments on AA6022-T4. We found that CBT significantly enhanced the elongation-to-fracture and strength, over uniaxial tension. In the present paper, our understanding of CBT is expanded beyond these experimental observations, with the aid of material modeling and numerical simulations of the process. Cyclic tension-compression experiments were performed on this material, using strain histories that are expected to replicate the loading during CBT, i.e., different combinations of constant strain amplitude and linearly increasing mean value, to failure. During these experiments, a limited but not negligible amount of kinematic hardening was discovered. Some of these experiments are used for calibration of a combined isotropic-kinematic hardening model, while the rest are used for experimental validation of the model. The modeling framework is based on a rate-independent, associated flow rule with the von Mises yield criterion as the plastic potential. Isotropic hardening is introduced by a simple, exponential-decay model of the growth of the yield surface with plastic deformation. Non-linear kinematic hardening is introduced by a 4-term, Chaboche-type model. The large strain hardening curve is identified by extrapolation, an approach that is validated later in the work and contrasted with alternative options. This material modeling framework is introduced in finite element models of the CBT process. The model is meshed with linear, reduced-integration elements, with 7 elements through the thickness. It is found that the numerical model reproduces the experimental force-displacement curve, including the succession of spikes and plateaus typical of CBT, very closely. The model also replicates the development of strain on the surface during CBT, and compares well with post-test strain measurements. After these validations, the model is used to probe the mechanics of the CBT process, e.g., the development of stress and strain through the thickness and per cycle, the location and onset of failure, as well as the failure angle, which in CBT differs from the localized neck angle found in a typical uniaxial tension experiment.
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