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An improved damage-coupled viscoplastic model for predicting ductile fracture in aluminum alloy at high temperatures
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-05-20 , DOI: 10.1016/j.jmatprotec.2021.117229
Yuanheng Guo , Yanmin Xie , Dongtao Wang , Lingfeng Du , Jiangbo Zhao

Predicting the ductile fracture in aluminum alloys during hot deformation is important for controlling product quality. To this end, this paper proposes an improved damage-coupled viscoplastic model for predicting the ductile fracture in aluminum alloys at high temperatures. For this model, a dislocation-based viscoplastic model is adopted, and a novel high-temperature damage model is further proposed. The proposed damage model considers the temperature and strain rate effects and also the nonlinear characteristics and stress triaxiality effect of damage evolution. The influence of stress triaxiality is evaluated through notched tensile tests conducted at different temperatures. To describe the actual material degradation, the damage variable is coupled with yield criteria according to continuous damage mechanics. Furthermore, the determination of model parameters based on the results of the uniaxial and notched tensile tests at different temperatures is considered in detail. The proposed constitutive model is applied to analyze damage evolution in a hot tensile process and to predict the fracture occurring during an isothermal bulging test, by employing the user-defined material subroutine VUMAT. The experimental and simulation results showed good agreement, thereby proving the validity of the proposed model for predicting the ductile fracture in aluminum alloys during hot deformation. This study introduces a novel damage model for predicting the ductile fracture in materials, such as aluminum alloys and certain metallic materials, dominated by tensile deformation at high temperatures.



中文翻译:

一种改进的损伤耦合粘塑性模型,用于预测高温下铝合金的延性断裂

预测铝合金在热变形过程中的韧性断裂对于控制产品质量非常重要。为此,本文提出了一种改进的损伤耦合粘塑性模型,用于预测铝合金在高温下的延性断裂。对于该模型,采用了基于位错的粘塑性模型,并进一步提出了一种新型的高温损伤模型。提出的损伤模型考虑了温度和应变率效应,以及损伤演化的非线性特征和应力三轴效应。应力三轴性的影响通过在不同温度下进行的缺口拉伸试验进行评估。为了描述实际的材料降解,根据连续的损伤机理,将损伤变量与屈服准则相结合。此外,详细考虑了基于在不同温度下的单轴拉伸和缺口拉伸测试的结果确定模型参数的方法。通过使用用户定义的材料子例程VUMAT,所提出的本构模型可用于分析热拉伸过程中的损伤演变并预测在等温鼓胀测试期间发生的断裂。实验和仿真结果吻合良好,从而证明了该模型在预测铝合金热变形过程中的韧性断裂方面的有效性。这项研究引入了一种新颖的损伤模型,用于预测材料(例如铝合金和某些金属材料)的延性断裂,这些材料在高温下会受到拉伸变形的影响。

更新日期:2021-05-26
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