Dynamic Mechanical Behavior and Constitutive Relationship of Superalloy GH4169
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摘要: 采用材料试验机对GH4169高温合金光滑试样与缺口试样进行应变速率为0.000 1~0.010 0 s-1下的室温准静态拉伸试验，再利用分离式霍普金森拉、压杆装置进行温度为20~400℃、应变速率为1×102~4×103 s-1下的动态拉伸、压缩试验，得到准静态和动态下的真应力-真应变曲线与失效应变；根据试验数据，采用分步拟合法确定了Johnson-Cook材料模型和失效模型参数，基于Johnson-Cook模型对动态压缩行为进行模拟，并进行试验验证。结果表明：GH4169高温合金的屈服强度随应变速率的增大而增大，随试验温度的升高而降低，该合金具有应变速率强化效应和温度软化效应；模拟结果与试验结果吻合得较好，真应力-真应变曲线的最大相对误差为5.91%，表明经修正后的Johnson-Cook模型可较好地描述GH4169高温合金的动态力学行为。
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关键词:
- GH4169高温合金 /
- 应变速率强化 /
- 温度软化 /
- 本构模型
Abstract: The quasi-static tensile tests were conducted on smooth sample and notched sample of superalloy GH4169 under strain rates of 0.000 1-0.010 0 s-1 at room temperature by the material testing machine. The dynamic tensile and compression tests were conducted under strain rates of 1×102-4×103 s-1 at 20-400℃ by split Hopkinson tension and pressure bar setup. The quasi-static and dynamic true stress-true strain curves and failure strains were obtained. Based on the experimental data, the parameters of Johnson-Cook material model and failure model were confirmed by the stepwise fitting method. The dynamic compression behavior was simulated by Johnson-Cook model, and verified by the experiment. The results show that the yield strength of superalloy GH4169 increased with the increase of strain rate, and decreased with the increase of test temperature; the alloy had a strain rate strengthening effect and a temperature softening effect. The simulation results were in good agreement with the experimental results, and the maximum relative error of the true stress-strain curve was 5.91%, indicating that the Johnson-Cook constitutive model could describe the dynamic mechanical behavior of superalloy GH4169 well. -
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