Dynamic Behavior and Numerical Modeling of Titanium 15-3-3-3 Alloy
Dynamic Behavior and Numerical Modeling of Titanium 15-3-3-3 Alloy
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钛 15-3-3-3 合金的动态行为和数值模拟
DOI：
10.1007/978-1-4614-4238-7_30
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
V. Kuokkala
中科院分区：
文献类型：
--
作者：
M. Hokka;T. Leemet;A. Shrot;M. Bäker;V. Kuokkala
亚稳β钛合金联合收割机结合了优异的机械性能和低密度，因此在许多机械要求高的应用中非常有吸引力。然而，高强度和硬度在这些材料的加工中引起若干挑战，并且钛部件的加工成本与部件的总成本相比可能是显著的。切削条件可以使用有限元模拟进行优化，从而降低加工成本并提高加工质量。然而，相当复杂的加工过程的模拟需要可靠的材料模型。只有在充分了解材料的力学行为时，才能生成模型。在这项工作中，Ti-15-3-3-3合金的机械响应的特点是在很宽的应变速率和温度范围。将Johnson-Cook材料模型与测量数据进行拟合，并利用该模型模拟材料的正交切割。仿真结果与高速切削实验结果进行了比较。目前的模型是能够模拟锯齿形芯片的形成经常观察到在加工钛合金在高切削速度。此外，模拟的切削力与实验获得的力匹配良好。然而，该模型还需要进一步开发，以匹配切屑的细节，如切屑卷曲和单个锯齿的厚度。
Metastable beta titanium alloys combine excellent mechanical properties with low density, and are therefore very attractive in many mechanically demanding applications. The high strength and hardness, however, cause several challenges in the machining of these materials, and the machining costs of titanium components can be significant compared to the overall costs of the component. The cutting conditions can be optimized using finite element simulations, leading to reduced machining costs and improved machining quality. However, the simulations of the rather complex machining processes need reliable material models. The models can only be generated when the mechanical behavior of the material is well understood. In this work, the mechanical response of Ti-15-3-3-3 alloy has been characterized in a wide range of strain rates and temperatures. The Johnson-Cook material model was fit to the measurement data, and the model was used to simulate orthogonal cutting of the material. The simulation results were further compared to cutting experiments at high cutting speeds. The current model is able to simulate the serrated chip formation frequently observed in machining of titanium alloys at high cutting speeds. Also, the simulated cutting forces match well with the experimentally obtained forces. However, the model needs to be further developed to match also the fine details of the chip, such as the chip curl and thickness of the individual serrations.