期刊论文

Liu, Y.(Liuyouw8294@sina.com)

中文

固体力学学报

0254-7805

2012

33

3

288-295

10.19636/j.cnki.cjsm42-1250/o3.2012.03.008

10872065,50801025:国家自然科学基金 200805320023:高等学校博士学科点专项科研基金 60870005:汽车车身先进设计制造国家重点实验室

本校为第一机构

运用弹性力学的复势方法,研究了纵向剪切下增强相/夹杂内螺型位错偶极子与含共焦钝裂纹椭圆夹杂的干涉效应,得到了该问题复势函数的封闭形式解答,由此推导出了夹杂区域的应力场、作用在螺型位错偶极子中心的像力和像力偶矩以及裂纹尖端应力强度因子的级数形式解.并分析了位错偶极子倾角φ、钝裂纹尺寸和材料常数对位错像力、像力偶矩以及应力强度因子的影响.数值计算结果表明:位错像力、像力偶矩以及应力强度因子均随位错偶极子倾角做周期变化;夹杂内部的椭圆钝裂纹明显增强了硬基体对位错的排斥,减弱了软基体对位错的吸引,且对于硬夹杂,位错出现了一个不稳定平衡位置,该平衡位置随钝裂纹曲率的...

By using the complex variable method of elasticity, interaction between a screw dipole inside inhomogeneity/reinforced phase and a confocal blunt crack in elastic elliptical inhomogeneity is investigated and a closed solution is obtained. The stress field of inhomogeneity, the image force and image torque acting on the center of screw dipole and the stress intensity factor of the blunt crack tip are obtained in the series form. The influences of the dip angle of screw dipole φ, the size of blunt crack and the material parameters on them are an...