为研究TC4钛合金的动态力学性能及本构模型，利用电子万能试验机、高速液压伺服试验机和分离式Hopkinson压杆(SHPB)装置，对其进行常温下准静态、中应变率和高应变率动态力学性能试验，得到不同应变率下的应力应变曲线，拟合得到Johnson-Cook 本构模型，并分析材料中应变率力学特性对本构模型参量的影响。结果表明：TC4钛合金在应变率10-4~103s-1范围内具有明显的应变率强化效应和一定的应变硬化效应，且应变率强化效应随应变的增大而减小，应变硬化效应随应变率的增大而减小；考虑材料中应变率力学特性可提高本构模型参量的准确性；通过数值方法和试验方法研究TC4钛合金平板撞击和高速拉伸过程的动态响应，两者结果具有很好的一致性，证明本文所得本构模型的准确性。
Abstract
In order to study the dynamic mechanical property and constitutive model of TC4 titanium alloy , dynamic experiments for TC4 titanium alloy under quasi-static，intermediate strain rate and high strain rate were performed by using an electronic universal testing machine, a high velocity hydraulic servo-testing machine and a split Hopkinson press bar ( SHPB) at room temperature. The stress-strain curves under different strain rates were obtained, and a Johnson-Cook constitutive model was fitted. The dynamic mechanical property under intermediate strain rate and the effect to the constitutive model were analyzed. The experimental results show that the strain rate hardening effect and strain hardening effect of TC4 titanium alloy is obvious between 10-4~10-3s-1, the strain rate hardening effect decreases with increase in strain, and the strain hardening effect decreases with increase in strain rate. Moreover, the mechanical property under intermediate strain rate can improve the veracity of the rate sensitive parameters. Good agreement is obtained between experimental results and numerical predictions of the high speed tensile and ball impact process, which validates the accuracy of Johnson-Cook constitutive model.
关键词
TC4钛合金 /
中应变率 /
应变率效应 /
Johnson-Cook本构模型 /
平板撞击 /
数值仿真。
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Key words
TC4 titanium alloy /
intermediate strain rate /
strain rate effect /
Johnson-Cook constitutive model /
plate impact /
numerical simulation
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