Effect of Material Nonlinearity on Symmetric Aluminum Metal-Matrix Laminated Composite Beams Under a Bending Moment

摘要

In this study,an elastic-plastic stress analysis is carried out on symmetri laminated composite beams subjected to a bending moment.The composite beam is to be strain hardening.The Tsai-Hill theory isj used as a yield criterion in the solution.The Bernoulli and Euler hypotheses ae assumed ot be valid.The beam lay-up sequences are chosen as [90deg/0deg]_s,[30deg/-30deg]_s,[45deg/-45 deg]_s,and [60deg/-60deg_s.The bending moment starting plastic yielding is found to be highest for [3-deg/30deg]_s orientation.sigma_x residual stress component is found to be highest at the upper and lower surfaces.However sigma_x residual stress ocmponent becomes the highest at the elastic and plastic boundary for further expansionof the plastic region.The transverse displacement is obtained at the free end,numerically.