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Constitutive modelling of high strength titanium alloy Ti-6Al-4 V for sheet forming applications at room temperature

机译：高强度钛合金Ti-6AL-4 V在室温下的组成型建模

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To enable the design and optimisation of forming processes at room temperature the material behaviour of Ti-6Al-4 V needs to be accurately represented in numerical analysis and this requires an advanced material model. In particular, an accurate representation of the shape and size of the yield locus as well as its evolution during forming is important. In this study a rigorous set of experiments on the quasi-static deformation behaviour of a Ti-6Al-4 V alloy sheet sample at room temperature was conducted for various loading conditions and a constitutive material model developed. To quantify the anisotropy and asymmetry properties, tensile and compression tests were carried out for different specimen orientations. To examine the Bauschinger effect and the transient hardening behaviour in - plane tensile - compression and compression - tensile tests were performed. Balanced biaxial and plane strain tension tests were conducted to construct and validate the yield surface of the Ti-6Al-4 V alloy sheet sample at room temperature. A recently proposed anisotropic elastic-plastic constitutive material model, so-called HAH, was employed to describe the behaviour, in particular for load reversals. The HAH yield surface is composed of a stable component, which includes plastic anisotropy and is distorted by a fluctuating component. The key of the formulation is the use of a suitable yield function that reproduces the experimental observations well for the stable component. Meanwhile, the rapid evolution of the material structure must be captured at the macro - scale level by the fluctuating component embedded in the HAH model. Compared to conventional hardening equations, the proposed model leads to higher accuracy in predicting the Bauschinger effect and the transient hardening behaviour for the Ti-6Al-4 V sheet sample tested at room temperature.
机译：为了能够在室温下成形工艺的Ti-6AL-4V的需求材料特性在数值分析来精确地表示的设计和优化，这需要一个先进的材料模型。特别地，在形成时的成品率基因座的形状和尺寸以及其演进的精确表示是非常重要的。在这项研究中一套严格的上在室温下的Ti-6AL-4V的合金板试样的准静态变形行为的实验中对于不同负载条件下，开发了构成材料模型中进行。为了量化各向异性和不对称性能，拉伸和压缩试验为不同的试样的取向进行。为了检查鲍辛格效应和瞬变硬化行为 - 面内拉伸 - 压缩和压缩 - 进行拉伸试验。平衡双轴和平面应变张力测试进行在室温下以构建和验证的Ti-6AL-4V的合金板试样的屈服面。最近提出的各向异性弹塑性构成材料模型，所谓的HAH，被用于描述的行为，特别是用于负载逆转。的HAH屈服表面由稳定组分，其包括塑性各向异性且由变动成分扭曲的。制剂的关键是使用再现实验观察以及用于稳定组分的合适屈服函数。通过嵌入在HAH模型中的变动成分等级 - 同时，材料结构的迅速发展必须在宏被捕获。相比于传统的淬火方程，所提出的模型导致更高的准确度在预测鲍辛格效应和在室温下测试在Ti-6AL-4V的片样品的瞬时硬化行为。

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