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J-lntegral Analysis of Surface Cracks in Round Bars under Combined Loadings

机译：组合载荷作用下圆钢表面裂纹的J-积分分析

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摘要

This paper presents a non-linear numerical investigation of surface cracks in round bars under combined bending and torsion loadings by using ANSYS finite element analysis (FEA). Due to the nonsymmetrical analysis, a full finite element (FE) model was constructed and special attention was given at the crack tip of the cracks. The surface cracks were characterized by the dimensionless crack aspect ratio, a/b = 0.6,0.8, 1.0 and 1.2, while the dimensionless relative crack depth, a/D = 0.1, 0.2 and 0.3. The square-root singularity of stresses and strains was modeled by shifting the mid-point nodes to the quarter-point locations in the region around the crack front. The proposed model was validated with the existing model before any further analysis. The elastic-plastic analysis under the loading was assumed to follow the Ramberg-Osgood relation with strain hardening exponent, n = 5 and 10.J values were determined for all positions along the crack front and then, the limit load was predicted using the J values obtained from FEA through the reference stress method.
机译：本文利用ANSYS有限元分析（FEA），对弯曲和扭转载荷作用下圆棒表面裂纹的非线性数值研究。由于非对称分析，建立了一个完整的有限元（FE）模型，并特别注意了裂纹的裂纹尖端。表面裂纹的特征在于无因次裂纹纵横比a / b = 0.6、0.8、1.0和1.2，而无因次相对裂纹深度a / D = 0.1、0.2和0.3。应力和应变的平方根奇异性是通过将中点节点移动到裂纹前沿周围区域的四分之一点位置来建模的。在进行任何进一步分析之前，将使用现有模型对提议的模型进行验证。假定在载荷下的弹塑性分析遵循与应变硬化指数相关的Ramberg-Osgood关系，分别确定n = 5和10。沿裂纹前沿的所有位置确定J值，然后使用J预测极限载荷通过参考应力法从FEA获得的数值。

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  • 来源
  • 会议地点 Sanya(CN)
  • 作者

    A.E Ismail; A.K Ariffin; S. Abdullah; M.J Ghazali; R. Daud;

  • 作者单位

    Dept. of Engineering Mechanics,Faculty of Mechanical Manufacturing Engineering,Universiti Tun Hussein Onn Malaysia,Batu Pahat,86400 Johor,Malaysia;

    Dept. of Mechanical Materials Engineering,Faculty of Engineering Built-Environment,Universiti Kebangsaan Malaysia,Bangi,43600 Selangor,Malaysia;

    Dept. of Mechanical Materials Engineering,Faculty of Engineering Built-Environment,Universiti Kebangsaan Malaysia,Bangi,43600 Selangor,Malaysia;

    Dept. of Mechanical Materials Engineering,Faculty of Engineering Built-Environment,Universiti Kebangsaan Malaysia,Bangi,43600 Selangor,Malaysia;

    Dept. of Mechanical Materials Engineering,Faculty of Engineering Built-Environment,Universiti Kebangsaan Malaysia,Bangi,43600 Selangor,Malaysia;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

    J-lntegral; Limit Load; Finite Element Analysis; Surface Crack; Stress Intensity Factor;

    机译：J积分极限载荷有限元分析表面裂纹应力强度因子;

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