In this study, an elastic-plastic thermal stress analysis is carried out on a thermoplastic composite beam. Temperature is chosen to vary linearly along the sections of the beam. The beam is made of steel fibre thermoplastic matrix composite. It is fixed by two rigid planes at the ends. The solution is performed for 0°,45°,60° and 90° orientation angles. The orientation angle of 30° does not give any plastic yielding, for it melts before plastic yielding. The intensity of the residual stress component of σx is maximum at the upper and lower surfaces of the beam and is obtained to be the greatest for the orientation angle of 0°. The equivalent plastic strain is found to be the greatest for 0° and 60° orientation angles. Plastic yielding begins on the beam at the highest temperature for 45° orientation angle.
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