Elastoplastic Stress Analysis in a Woven Ni—Cr Reinforced Thermoplastic-matrix Composite Laminated Plates under Transverse Loading

Abstract

In this study, an elastoplastic stress analysis is carried out on the symmetric and antisymmetric cross-ply and angle-ply thermoplastic-laminated plates for transverse loading. A low density polyethylene (LDPE) thermoplastic-matrix and woven Ni—Cr fibers are used to produce composite plates by using molds. A first-order shear deformation theory and a nine-node Lagrangian finite element are used. Mathematical formulation is given for the elastoplastic stress analysis of a laminated plate for small deformations. The yield points and stresses are obtained for symmetric and antisymmetric clamp supported laminated plates with a square hole. The residual stresses in the thermoplastic plates are given in the tables. The expansion of plastic zones is illustrated for 200, 350, and 500 loading steps. The yield points and expansion of plastic zones are compared for different plates. The mechanical properties of a layer are obtained experimentally. The intensity of the residual stress components is maximum near the square hole and clamped supports.

Keywords

elastic—plastic stress analysis thermoplastic composite reinforced laminated plates residual stress plastic expansion finite element method transverse loading

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