An expression of stress concentration factor for a circular hole eccentrically located in a tensile finite-width strip of orthotropic material

Abstract

An explicit expression of stress concentration factor (SCF) for a circular hole eccentrically located in a finite-width strip of orthotropic material subjected to remote tension is derived using an approximate and analytical method. The eccentricity of the hole and the ratio of the diameter to strip width are two governing geometric parameters, and their effect to the SCF is shown clearly in the expression. The formulation for the expression is consisted of two steps, first, the derivation is based on section method using balance of force and moment, respectively, second, improvement is done by empirical modification of the related coefficients based on asymptotic matching of good results obtained for some special cases. The accuracy of the final SCF expressions is adequate except the extreme case where the eccentricity of the circular hole is very large, i.e. when the hole is located very near to one side of the strip. On the other hand, when the eccentricity is taken as zero, i.e. for the simplified case of a central circular hole in a finite-width strip, the corresponding SCF expression has good accuracy. The present work is an extension of previous work for central circular hole of orthotropic material and an eccentric circular hole for isotropic material.