椭圆孔三维应力集中及其对疲劳强度的影响  

Three-dimensional stress concentration and its influence on the fatigue strength at an elliptic hole

作　　者：佘崇民 郭万林[1] 孟波[2] 张斌[1] 

机构地区：[1]南京航空航天大学纳米科学研究所,江苏南京210016 [2]北京石油化工学院机械工程学院过装系,北京102617 [3]不详

出　　处：《计算力学学报》2007年第2期215-218,共4页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(50275073);中国博士后科学基金(20060390282);航空科学基金(03B52011)资助项目

摘　　要：应用有限单元法对有限厚中心椭圆孔板的三维应力集中进行了分析。发现厚板的最大应力集中总是与自由表面保持一固定的距离而不随板厚的增加而变化;椭圆形状因子越小,距离自由表面越近。得到了最大三维应力集中、表面应力集中与相应平面解之间的近似关系和经验公式;研究了厚度对疲劳强度的影响,并给出相应的影响系数。The through-thickness variations of stress concentration factor （SCF） along the wall of elliptic holes in finite thickness plates have been analyzed using the finite element （FE） method. For a thick plate, the distance between the location of the maximum SCF and the free surface is invariable and independent of its thickness; it is smaller for lower elliptical shape factor. The relationships of the maximum SCF, surface SCF and the corresponding planar solution were found, and the corresponding empirical formulae were obtained by fitting the FE results. The influence of thickness on the fatigue strength was studied and a factor to describe this influence was also proposed.

关 键 词：应力集中 椭圆孔 三维 疲劳强度 

分 类 号：TB1[一般工业技术] O346[理学—固体力学]