摘要
为研究功能梯度材料V型缺口根部裂纹尖端附近的应力场强特性,讨论了指数型梯度材料的裂纹场强特点.以双边V型缺口试件为研究对象,建立试件的有限元分析模型.基于分层法分析静态载荷和阶跃冲击载荷下功能梯度材料V型缺口根部裂纹尖端的应力场强.研究结果表明:静载荷下,缺口根部裂纹前沿中面裂尖等效应力、位移及应力强度因子随着梯度参数β的增大而增大;应力强度因子K随张开角α的增大而减小,且在0°~60°之间减小缓慢,而在60°~90°之间减小程度明显,而在大于90°时随张开角α迅速减小.在冲击阶跃载荷下随着梯度参数β的增大,其动态应力强度因子值减小.
In order to research the characteristics of stress field intensity crack tip of V notch root of func tionally gradient material, the speciality of crack stress field intensity of exponentially gradient material is discussed. Taking the specimen of double edged V formed notch as the research object, its finite element analysis model is established. Under static load and step impact load, the stress field intensity at the crack tip of the notch root is analyzed based on stratification method. The research result shows that the equiva lent stress, displacement, and stress intensity factor of middle crack tip in the crack front of the notch root crack will increase with the gradient parameter β under static load and the stress intensity factor K will de crease with the increase of the opening angle α and decrease slowly within the range from 0° to 60°, obvi ously within the range from 60° to 90°, and rapidly when a is greater than 90°. Under the impact step load, the dynamic stress intensity factor will decrease with the gradient parameter β.
作者
李有堂
王勇
LI You-tang;WANG Yong(College of Mechano Electronic Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China)
出处
《兰州理工大学学报》
CAS
北大核心
2018年第4期162-166,共5页
Journal of Lanzhou University of Technology
关键词
功能梯度材料
V型缺口
根部裂纹前沿
梯度参数
应力强度因子
Functionally gradient material
V notch
root crack front
gradient parameter
stress intensity factor
作者简介
李有堂（1963-），男，甘肃定西人，博士，教授，博导．
