Elasto-plastic Stress Analysis in a Thermoplastic Composite Laminated Plate with Open Circular Hole Loaded Transversely

Abstract

In the present study an elastic-plastic stress analysis is carried out for long stainless steel fiber-reinforced homogeneous polyethylene thermoplastic composite laminated plates with open circular hole by using finite element technique.The thermoplastic composite layer reinforced by long stainless fiber is manufactured using molds under a pressure of 15 MPa and heating up to 170 C by electrical resistance. The laminated plates with open hole consist of four layers and bonded symmetrically and antisymmetrically. Each layer with constant thickness is meshed into 48 elements and 228 nodes with simply supported. The expansion of plastic zone and residual stress are determined in the symmetric and antisymmetric cross-ply and angle-ply laminated plates for small deformations. The load is increased by 0.01 N/mm at each step. Iteration numbers are chosen as 150, 300, and 600. The intensity of the residual stress is maximum near the open circular hole and the yield points in symmetric laminates are higher than those in antisymmetric laminates.