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Characterization and numerical modeling of high strain rate mechanical behavior of Ti-15-3 alloy for machining simulations

机译：Ti-15-3合金高应变速率力学性能的表征和数值模拟

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摘要

Metastable beta titanium alloys combine light weight, high strength, and excellent corrosion and fatigue resistance, and can therefore be very useful in many demanding applications. However, they are also difficult to machine and the machining costs of titanium components can be significant compared to the overall costs of the component. Finite element simulations can be used to optimize the cutting conditions and reduce the machining costs. However, any attempt to simulate the rather complex machining processes needs reliable material models that can only be generated when the mechanical behavior of the material is understood well. In this work, the mechanical properties and behavior of titanium 15-3 alloy was studied in a wide range of strain rates and temperatures, and a constitutive model was generated for simulating orthogonal cutting of the alloy. The strain-hardening rate ofTi-15-3 is a strong function of strain rate, and it decreases rapidly as the strain rate is increased. Also, the strain rate sensitivity of the material was found to depend strongly on temperature. Johnson-Cook plasticity model, based on isothermal stress-strain curves, was used to model the behavior of the material. The isothermal stress-strain response was calculated from the experimental data, and the model used in the simulations was modified to account also for the adiabatic heating and consequent thermal softening of the material. The current model is able to simulate the serrated chip formation frequently observed for titanium alloys at high cutting speeds.
机译：亚稳态β钛合金具有重量轻，强度高以及出色的耐腐蚀和抗疲劳性，因此在许多苛刻的应用中非常有用。然而，它们也难以加工，并且钛部件的加工成本与部件的总成本相比可能很高。有限元模拟可用于优化切削条件并降低加工成本。但是，任何模拟相当复杂的加工过程的尝试都需要可靠的材料模型，只有在充分了解材料的机械性能后才能生成可靠的材料模型。在这项工作中，研究了钛15-3合金在较宽的应变速率和温度范围内的力学性能和行为，并生成了用于模拟合金正交切削的本构模型。 Ti-15-3的应变硬化速率是应变速率的强函数，并且随着应变速率的增加而迅速降低。同样，发现材料的应变速率敏感性强烈依赖于温度。基于等温应力-应变曲线的Johnson-Cook可塑性模型用于对材料的行为进行建模。从实验数据计算出等温应力-应变响应，并对模拟中使用的模型进行了修改，以考虑绝热和材料的热软化。当前的模型能够模拟钛合金在高切削速度下经常观察到的锯齿状切屑形成。

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