基于有限元法的双边切槽根部裂纹应力强度因子研究-《建筑科学与工程学报》

文章信息/Info

Title:: Study of Stress Intensity Factor on Double Notch Root Crack Based on Finite Element Method

Author(s):: YIN Guan-sheng， HAN Huan; School of Science， Chang’an University

Keywords:: fracture; stress intensity factor; double notch; crack length; ANSYS; finite element method; defect

摘要:: 以裂纹区域和破坏结构的断裂参数（应力强度因子）作为判断裂纹是否进入失稳状态的主要依据，使用有限元软件ANSYS分别对不同尺寸的圆弧形和角形切槽根部裂纹问题进行分析，确定裂纹尖端应力强度因子的变化特征。分析结果表明：同一裂纹长度，角形切槽的应力强度因子大于圆弧形的，同时角形切槽裂纹尖端应力集中现象比圆弧形更严重；圆弧形切槽尖端的应力强度因子随着裂纹尺寸变化的速度比角形的快；裂纹长度在0~4 mm变化时，2种切槽应力强度因子有明显变化；当裂纹长度大于4 mm时，2种切槽应力强度因子随着裂纹长度变化的幅度逐渐减小，最终趋于平稳并重合。

Abstract:: Based on the crack area and the fracture parameters of the structure (stress intensity factor) to determine whether the crack was in unstable state or not, the finite element software ANSYS was applied to analyze the root crack problem for the arc-shaped and the angular notch with different dimensions, and to determine the variation characteristics of the stress intensity factor in crack tip. The analysis results show that for the same crack length, the stress intensity factor of the angular notch is greater than that of the arc-shaped;the stress concentration of the angular notch is more serious than that of the arc-shaped; the change speed of the stress intensity factor in arc-shaped notch tip is faster than that of the angular shaped. The stress intensity factors of these two forms of notches change obviously when the crack lengths change from 0 mm to 4 mm. The change magnitudes of the stress intensity factors of these two forms of notches will decrease when the crack length is larger than 4 mm, then the stress intensity factors eventually tend to be stable and coincide.