압력용기 및 곡관에 대한 Elastic Compensation 방법에 따른 한계하중 분석

The elastic-compensation method determines the limit load by simulating the inelastic behavior through iterative adjustment of the elastic modulus. Several procedures for adjusting the elastic modulus and estimating the limit load have been proposed; however, validation has been performed only for specific geometries. In this study, the applicability of the elastic-compensation method is analyzed by comparing results calculated based on different elastic-modulus adjustment and limit-load estimation procedures for pressure-vessel and elbow geometries. Adjusting the elastic modulus for all elements yields inaccurate results for geometries with significant differences in terms of equivalent stress, whereas adjusting only elements with high equivalent stresses results in limit loads similar to those obtained from limit analysis. The method using the maximum limit load calculated from all iterations yields the accurate limit load.