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Study of Influence of Superimposed Hydrostatic Pressure on Ductility in Ring Compression Test
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-17 , DOI: 10.1007/s11665-020-05114-z
Amir Partovi , M. M. Shahzamanian , P. D. Wu

The effects of superimposed hydrostatic pressure on the ductility of compressed rings are investigated numerically by using the finite element method and employing the Johnson–Cook (JC) model. The ductility and fracture strain increase considerably by imposing hydrostatic pressure, which delays the initiation of cracks at the corners of the rings. Furthermore, the sensitivity of the ductile fracture parameters in the JC model on compressibility and crack initiation is considered. The effect of the shape factor on fracture in compressed rings under hydrostatic pressure is also investigated, and the predicted fracture strains are compared. Results show that fracture strain increases linearly with hydrostatic pressure regardless of the geometry of the rings. However, the initial value of fracture strain is small for tall rings. The numerical results are found to be in good agreement with experimental observations.



中文翻译:

环压试验中叠加静水压力对延性的影响研究

使用有限元方法并采用Johnson-Cook(J - C)模型,对叠加的静水压力对压缩环的延性的影响进行了数值研究。通过施加静水压力,可塑性和断裂应变显着增加,这延迟了环角处裂纹的产生。此外,JC中韧性断裂参数的敏感性考虑可压缩性和裂纹萌生的模型。还研究了形状因数对静水压力下压缩环断裂的影响,并比较了预测的断裂应变。结果表明,无论环的几何形状如何,断裂应变均随静水压力线性增加。但是,对于高环,断裂应变的初始值较小。发现数值结果与实验观察结果非常吻合。

更新日期:2020-09-18
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