Residual stress analysis and expansion of plastic zone in simple supported woven Ni-Cr reinforced thermoplastic matrix composite laminated plates

Abstract

In this study, a residual stress analysis is carried out on symmetric and antisymmetric cross-ply and angleply thermoplastic simple supported laminated plates for transverse loading. Low density polyethylene thermoplastic matrix (LDPE) and woven Ni-Cr fibers are used to produce the composite plates by using moulds. First order shear deformation theory and nine nodes Lagrangian finite element are used. A mathematical formulation is given for the elasto-plastic stress analysis of a laminated plate for small deformations. Yield points and stresses are obtained for symmetric and antisymmetric simple supported laminated plates with a square hole. Residual stresses in thermoplastic plates are given in tables. The expansion of plastic zones is illustrated for 200, 400 and 600 loading steps. Yield points and the expansion of plastic zones are compared for different plates. Mechanical properties of a layer are obtained experimentally. The intensity of the residual stress components is maximum near the square hole. © Freund Publishing House Ltd.