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Experimental verification of anisotropic constitutive models under tension-tension and tension-compression stress states
International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.ijmecsci.2020.105618
Kun Zhang , Zhubin He , Kailun Zheng , Shijian Yuan

Abstract Constitutive model is vitally important to finite element simulation which determines the accuracy and reliability of predicting material yield and plastic flow behaviors. Due to lack of accurate and sufficient experimental data for the tension-compression (T-C) stress state, the anisotropic constitutive model can only be calibrated with tension-tension (T-T) data and its accuracy cannot be thoroughly verified under the complete stress states, including T-T and T-C stress states. To address the limitation, a novel controllable biaxial loading test device was developed to conduct systematic experiment and determine sufficient data. Using such a device, arbitrary stress paths can be applied to thin-walled tubes under T-T and T-C stress states. Subsequently, the yield and plastic flow behavior of anisotropic AA6061-O tubes were analyzed through the measured stress and strain data. These were then used to verify the accuracy of common anisotropic constitutive models including Hill48, Barlat-Lian, and Yld2000-2d, those are extensively implemented in commercial finite element software, under the complete stress states. It is indicated that the yield behavior exhibited anisotropy in the complete stress states, but the yield characteristics differ for the T-T and T-C stress states. The plastic flow behavior exhibits isotropic characteristics in the T-C stress state, while anisotropic in the T-T stress state. These common anisotropic constitutive models can accurately describe yield and plastic flow behavior in either T-T or T-C stress state only. None of the models are able to provide accurate predictions of the plastic deformation behavior both in the T-T and T-C stress states simultaneously.

中文翻译:

拉-拉和拉-压应力状态下各向异性本构模型的实验验证

摘要 本构模型对于有限元模拟至关重要,它决定了预测材料屈服和塑性流动行为的准确性和可靠性。由于拉压(TC)应力状态缺乏准确和充分的实验数据,各向异性本构模型只能用拉压(TT)数据进行标定,无法在完整的应力状态下彻底验证其精度,包括TT 和 TC 应力状态。为解决这一局限性,研制了一种新型可控双轴加载试验装置,进行系统实验并确定足够的数据。使用这种装置,可以将任意应力路径应用于 TT 和 TC 应力状态下的薄壁管。随后,通过测量的应力和应变数据分析了各向异性 AA6061-O 管的屈服和塑性流动行为。然后将这些用于验证常见的各向异性本构模型的准确性,包括 Hill48、Barlat-Lian 和 Yld2000-2d,这些模型在商业有限元软件中在完整应力状态下广泛实施。表明在完全应力状态下屈服行为表现出各向异性,但在 TT 和 TC 应力状态下屈服特性不同。塑性流动行为在TC应力状态下表现出各向同性特征,而在TT应力状态下表现出各向异性。这些常见的各向异性本构模型只能准确地描述在 TT 或 TC 应力状态下的屈服和塑性流动行为。
更新日期:2020-07-01
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