A METHOD FOR DETERMINING LOCAL ELASTOPLASTIC STRESS AND STRAIN IN METALLURGICALLY BONDED NOTCHED LAMINATES SUBJECTED TO A LOADING CYCLE

摘要

A semianalytical method was developed for determining elastoplastic cyclic stresses and strains at notch roots in metallurgically bonded metal laminates. The method is based on the Neuber equation, which was used with an "effective" stress-strain curve for the laminate. It was applied to laminates containing a circular hole which were subjected to one cycle of reversed loading. The laminates consisted of two elasto-perfectly-plastic mate¬rials with different yield strengths and with either equal or different Young's moduli. A lam¬inate of high-strength titanium alloy with alternate layers of commercially pure titanium was also analyzed.nThe accuracy of the method was evaluated by comparing the stresses and strains with those calculated from a finite-element analysis. The results estimated by the simple method based on the Neuber equation agreed closely with the results computed from the more elaborate finite-element analysis.