Elasto-plastic thermal stress analysis in symmetric thermoplastic laminates

In this study, a thermal elastic-plastic stress analysis is carried out in steel fiber-reinforced symmetric thermoplastic laminated plates. The material is assumed to be strain-hardening. The orientation angles are chosen as, (0 degrees/90 degrees)(s), (30 degrees/ -30 degrees)(s), (45 degrees/-45 degrees)(s), (60 degrees/-60 degrees)(s), (15 degrees/0 degrees)(s), (30 degrees/0 degrees)(s), (45 degrees/0 degrees)(s), (60 degrees/0 degrees)(s), (75 degrees/0 degrees)(s). The Tsai-Hill theory is used as a yield criterion in the solution. Temperature distribution is chosen as +T-0 and -T-0 at the upper and lower surfaces, respectively. It is found that plastic yielding occurs at the same temperature; all the orientation angles and the plastic region expands the same at the same temperature.