STRESS ANALYSIS AND EXPANSION OF PLASTIC ZONECOMPOSITE LAMINATED PLATES ([?0/-??0]2) UNDER TRANSVERSELOADS BY MEANS OF FEM

摘要

The aim of this work is to predict the expansion of the plastic zone and residual stresses in layers ofstainless steel woven fiber-reinforced thermoplastic matrix composite laminated plates ([?0/-??0]2) with rectangular hole. The elastic and elastic-plastic stresses are analyzed by using FEM by means of a developed computerprogram with FORTRAN 90. The laminated plates arranged in ([?0/-??0]2) configuration under uniform transverse loading are formed by stacking four composite layers bonded symmetrically or antisymmetrically. Loadingis gradually increased from yield point of the plate as 0.0001 Mpa at each load step. The elastic, elastic-plasticand residual stress components and the expansion of the plastic zones are obtained according to the load steps,different orientation angles and rectangular hole dimensions under clamped and simply supported boundaryconditions. Results showed that the maximum stress levels and the plastic zones appear the vicinity of the rectangular hole at the upper and lower layers.