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An elasto-plastic stress analysis in a thermoplastic composite beam of arbitrary orientation subjected to transverse uniformly distributed load

Esendemir U.

International Journal of Applied Mechanics and Engineering

2001

Vol. 6, no 2

325-344

Beam is a structural element loaded transversely in general conditions. This loading causes shear forces and bending moments. In this study, an elasto-plastic stress analysis is carried out in a low density polyethylene thermoplastic composite beam reinforced by woven steel fibers subjected to a uniformly distributed load in transverse direction. In the elasto-plastic solution, the material is assumed to be perfectly plastic. The expansion of the plastic region and the residual stress component of 'sigma'x are determined for 0°, 15°, 30°, and 45° orientation angles. Yielding begins for 0° and 45° orientation angles at the upper and lower surfaces of the beam at the same distances from the free end. It starts though first at the upper surface for 15° and 30° orientation angles. The intensity of the residual stress component of 'tau'xy is maximum on or around the x axis of the beam, but the residual stress component of 'sigma'x is maximum at the upper and lower surfaces.