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首页> 外文期刊>Journal of Materials Engineering and Performance >Study of Influence of Superimposed Hydrostatic Pressure on Ductility in Ring Compression Test
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Study of Influence of Superimposed Hydrostatic Pressure on Ductility in Ring Compression Test

机译：叠加静压压力对环形压缩试验中延性的影响研究

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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 (J-C) 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 theJ-Cmodel 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.
机译：采用有限元方法和约翰逊-库克（J-C）模型，数值研究了附加静水压力对压缩环延性的影响。通过施加静水压力，延展性和断裂应变显著增加，从而延迟环角处裂纹的萌生。此外，还考虑了J C模型中韧性断裂参数对压缩性和裂纹萌生的敏感性。还研究了形状因子对静水压下压缩环断裂的影响，并与预测的断裂应变进行了比较。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。然而，对于高环，断裂应变的初始值很小。数值结果与实验结果吻合良好。

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