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Determination of Johnson-Cook Plasticity Model Parameters for Inconel718

机译：Commel718的Johnson Cook塑性模型参数的确定

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摘要

In order to simulate foreign object damage (FOD) phenomenon in aircraft high-pressure compressor blades made of a nickel-based super-alloy, Johnson-Cook (J-C) plasticity model was used. For prediction of material's plastic behavior at temperature of 400 degrees C (working temperature of the blades) in the range of strain rates associated with the FOD phenomenon (in order of 106 s(-1)), material parameters of A, B, C, n and m for the J-C plasticity model had to be determined experimentally. Parameters of A, B and n with values of 1108, 699 MPa and 0.5189, respectively, were obtained from quasi-static tensile tests. Moreover, m was determined to be 1.2861, also through quasi-static tensile tests with a strain rate of 1 s(-1) at three temperatures of 475, 550 and 625 degrees C. However, in order to determine C, firstly a steel ball was impacted on the surface of a flat specimen made of a precipitation-hardening alloy, and then, the impact site was 3D scanned to obtain the induced crater profile. Finally, the impact test (ballistic) was simulated using Abaqus, and a C value of 0.0085 was determined by comparing the actual crater profile with the one obtained from the simulation through a trial-and-error approach.
机译：为了模拟由镍基超合金制成的飞机高压压缩机叶片中的异物损坏（FOD）现象，使用了Johnson-Cook（J-C）塑性模型。为了在与FOD现象相关的应变率的400℃（叶片的工作温度）温度下预测材料的塑料行为（按顺序为106秒（-1）），A，B，C的材料参数，对于JC塑性模型的N和M必须实验确定。分别具有1108,699MPa和0.5189的值的A，B和N的参数是从准静态拉伸试验中获得的。此外，M被确定为1.2861，也通过Quasi-静态拉伸试验，在475,550和625摄氏度的三个温度下应变速率为1 s（-1）。然而，为了确定C，首先是钢球受到由沉淀硬化合金制成的扁平试样的表面，然后，扫描位点被扫描3D以获得诱导的火山口曲线。最后，使用ABAQUS模拟冲击试验（弹道），通过将实际的火山口曲线与通过试验和误差方法从模拟中获得的一个获得的实际火山口曲线比较来确定0.0085的C值。

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