ABSTRACT Full-range strain hardening behaviour, containing the post-necking stage, is difficult to account for in detail. Hence, a Swift–Voce (S–V) model was used to describe the full-range stress–strain behaviour of 7050-T7451 aluminium alloy under uniaxial-tension, tension-with-notch and pure-shear processes with a hybrid experimental-numerical framework. Since the S–V model is not able to describe accurately the behaviour of Ti–6Al–4V alloy, a combined Swift and 4th degree polynomial (S-P4) model is proposed. Results indicate that the S–V model can successfully describe large-deformation behaviour of the 7050-T7451 aluminium alloy, and the S-P4 model can successfully describe that of the Ti–6Al–4V alloy based on careful designing process of the constitutive equation.

中文翻译：

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用于描述大应变范围内真实应力-应变曲线的本构方程

摘要 全范围应变硬化行为，包括后颈缩阶段，很难详细解释。因此，使用 Swift-Voce (S-V) 模型描述了 7050-T7451 铝合金在单轴拉伸、缺口拉伸和纯剪切过程下的全范围应力 - 应变行为，并进行了混合实验 -数值框架。由于 S-V 模型无法准确描述 Ti-6Al-4V 合金的行为，因此提出了 Swift 和 4 次多项式 (S-P4) 组合模型。结果表明，基于本构方程的精心设计过程，S-V模型可以成功地描述7050-T7451铝合金的大变形行为，S-P4模型可以成功地描述Ti-6Al-4V合金的大变形行为.