Analysis on Fracture during Uniaxial Tensile Test with Round Bar Sample based on I1 Fracture Criterion
-
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.
-
Keywords:
- I1 fracture criterion /
- uniaxial tensile test /
- fracture
-
-
[1] 薛钢. 基于应力第一不变量I1的断裂准则假设[J]. 材料开发与应用, 2014, 29(6):1-5. [2] 薛钢. 承受双向等拉应力的平面应变I型裂纹线弹性断裂的I1准则与K准则一致性分析[J]. 材料开发与应用, 2023, 38(1):1-8. [3] 薛钢. 各向同性均质材料典型断裂行为的I1断裂准则适用性分析[J]. 材料开发与应用, 2018, 33(4):1-5. [4] 薛钢. 承受单向静拉应力的有限宽板双边对称裂纹尖端I1/σMises的分布函数[J]. 材料开发与应用, 2016, 31(1):8-12. [5] 薛钢, 王涛, 杨超飞,等. 基于I1断裂准则的铁素体型钢焊接氢致开裂机制研究[J]. 材料开发与应用, 2018, 33(4):49-52. [6] 薛钢. 基于Mises屈服准则和I1断裂准则的焊接接头力学特性分析[J]. 材料开发与应用, 2022, 37(5):1-10. [7] 薛钢, 宫旭辉, 高珍鹏,等. 近似二维应力状态下I1断裂准则假设有效性的试验验证[J]. 材料开发与应用, 2018, 33(3):1-9. [8] MEYERS M A, CHAWLA K K. Mechanical behavior of materials[M]. 2nd ed. Cambridge:Cambridge University Press, 2009.
[9] CALLISTER W D. Materials science and engineering:an introduction[M]. 7th ed. New York:John Wiley & Sons, 2007.
[10] 薛钢. 各向同性均质弹塑性材料圆棒试样单向拉伸试验变形特性与应力应变本构关系的相关性分析[J]. 材料开发与应用, 2022, 37(2):24-36.
计量
- 文章访问数: 88
- HTML全文浏览量: 16
- PDF下载量: 14
下载:
