Ⅰ型裂纹应力强度因子的有限元计算方法  

Finite Element Method for Calculating Stress Intensity Factor of Type Ⅰ Crack

作　　者：李磅磅 邹志鉴 Li Bangbang;Zou Zhijian(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院,上海市200093

出　　处：《农业装备与车辆工程》2022年第4期70-73,共4页Agricultural Equipment & Vehicle Engineering

摘　　要：建立求解应力强度因子的三点弯曲试样模型,采用位移外推法、应力外推法、虚拟裂纹闭合法等3种不同的方法计算Ⅰ型裂纹应力强度因子K_(I)。研究了载荷、裂纹长度、试样的几何参数等对Ⅰ型裂纹应力强度因子的影响。结果表明,3种方法计算出的KI值的结果一致性良好,与解析解相比都能达到较高精度。分析比较3种计算方法,对裂纹应力强度因子计算方法的选择提供参考。A model for calculating the stress intensity factor of three-point bending specimen was established.Three different methods of displacement extrapolation,stress extrapolation and virtual crack closure are used to calculate the stress intensity factor K_Ⅰof type Ⅰ crack.The influences of load,crack length and geometrical parameters on the stress intensity factor of type Ⅰ crack were studied.The results show that the K_Ⅰ values calculated by the three methods are consistent and can achieve higher accuracy compared with the analytical solution.The analysis and comparison of the three calculation methods have a certain guiding significance for the choice of the calculation method of crack stress intensity factor.

关 键 词：应力强度因子 位移外推法 虚拟裂纹闭合法 三点弯曲试样 

分 类 号：U463.218[机械工程—车辆工程]