Stress Analysis of Symmetric Aluminum Composite-laminated Beams under a Bending Moment: Materially Nonlinear Only

In this study, an elastic-plastic stress analysis is carried out on symmetric laminated composite beams subjected to a bending moment. The composite beam is to be strain hardening. The Bernoulli and Euler hypotheses are assumed to be valid. The Tsai-Hill theory is used as a yield criterion in the solution. The solution is carried out for (90/0) ₂ , (30/30) ₂ , (45 /45) ₂ , and (60 /60) ₂ orientations. The bending moment is to be found the highest for the (30 /30) ₂ orientation. The residual stress component of x is the highest at the upper and lower surfaces. But it becomes the highest at the elastic and plastic boundary for further expansion of the plastic region. The transverse displacement is obtained at the free end, numerically.