Analysis on Fracture during Uniaxial Tensile Test with Round Bar Sample based on I1 Fracture Criterion
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摘要: 基于I1断裂准则开展了两种材料模型圆棒试样单轴拉伸断裂过程的有限元模拟，结果表明：颈缩变形阶段，最小截面中心位置最先形成裂纹，在裂纹形成瞬间失稳扩展成一定尺寸的圆形裂纹后停止扩展，在后续持续增大的位移载荷作用下，裂纹步进式扩展；裂纹的形成与失稳扩展伴随着轴向作用力的急剧降低，利用该特征可测定材料的断裂强度Ib。Abstract: Fractures during the uniaxial tensile test with round bar of two material models are analyzed by the elastic-plastic finite element method based on I1 fracture criterion. The results indicate that the crack forms in the center of the minimal section at first. The crack unstably propagates into a circular crack the moment it forms, and then the propagation ceases. With the displacement load continuously increasing, the crack propagates step by step. The axial force reduces sharply when the crack forms and propagates unstably. The fracture strength Ib can be measured by using this characteristic of the axial force's change.
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Keywords:
- I1 fracture criterion /
- uniaxial tensile test /
- fracture
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