Toribio Jesús, González Beatriz, Matos Juan-Carlos, González Iván
Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL), E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain.
Materials (Basel). 2022 Dec 19;15(24):9091. doi: 10.3390/ma15249091.
In this paper, stress intensity factor (SIF) solutions are numerically obtained for notched bars subjected to tensile loading containing an eccentric circular inner crack located in the cross-section corresponding to the notch root. The finite element method and the -integral have been used to obtain the SIF and to analyze the effect on it of three elliptical notch geometries (of equal radial depth). The results show how the SIF is greater in the notched bars than in the smooth bar and within the former when the axial semi-axis of the notch rises, its effect being greater as the diameter and eccentricity of the inner crack increase. In addition, the fatigue growth of an eccentric crack induces an increase in such eccentricity, greater as the notch axial semi-axis increases. The cause of these phenomena can be attributed to the constraint loss caused by the notch, which also facilitates bending of the specimen due to the asymmetry generated by the crack eccentricity.
本文通过数值方法获得了承受拉伸载荷的缺口棒材的应力强度因子（SIF）解，这些棒材在对应于缺口根部的横截面上含有一个偏心圆形内部裂纹。采用有限元方法和J积分来获得应力强度因子，并分析三种（具有相等径向深度的）椭圆形缺口几何形状对其的影响。结果表明，缺口棒材中的应力强度因子比光滑棒材中的大，并且在前者中，当缺口的轴向半轴增加时，应力强度因子增大，随着内部裂纹的直径和偏心距增加，其影响更大。此外，偏心裂纹的疲劳扩展会导致这种偏心距增加，随着缺口轴向半轴的增加，偏心距增加得更多。这些现象的原因可归因于缺口引起的约束损失，这也由于裂纹偏心产生的不对称性而促进了试样的弯曲。
