AN APPROXIMATE METHOD TO BUILD AN IMPROVED STRESS-FIELD IN LOCAL REGIONS

An approximate procedure to enhance the accuracy of the continuous str ess field in local regions has been proposed, based on Loubignac's ite rative method and the theory of conjugate approximations. The validity of the proposed method has been tested through three examples: a thic k-walled cylinder under internal pressure; an infinite plate with a ce ntral circular hole subjected to uniaxial tension; and a short cantile ver beam. Analysis of the examples shows that the stress field obtaine d for the local region model by the proposed method agrees well with t hat for the whole domain model. In addition, a significant reduction i n computing time to obtain the improved stress field implies that the proposed method can be an efficient alternative for the detailed stres s analysis in local regions.