ELASTIC-PLASTIC STRESS ANALYSIS OF LAMINATED COMPOSITE BEAMS UNDER LINEAR TEMPERATURE DISTRIBUTION

• Published in: Journal of thermal stresses 2004-11, Vol.27 (11), p.1075-1088
• Main Authors: Çallioğlu, H., Tarakcilar, A. R., Bektaş, N. B.
• Format: Article
• Language: English
• Subjects: analytical study; laminated beam; residual stress; stress analysis; thermal stress
• ISSN: 0149-5739; 1521-074X
• DOI: 10.1080/01495730490498412

This study deals with elastic-plastic stress analysis of symmetric laminated composite beams with perfectly clamped ends under linear temperature distribution. The Bernoulli-Euler theory is used during the solution considering infinitesimal small deformations. The composite beam is assumed to be linear strain hardening. The Tsai-Hill theory is used as a yield criterion in the solution. The stacking sequences of the composite beam are chosen as (90°/0°) s , (30°/−30°) s , (45°/−45°) s , (60°/−60°) s and also (0°) 4 and (90°) 4 in comparison with the composite beam of a single layer in the literature. The results obtained are in good agreement with the literature. The temperature that causes plastic yielding is found to be highest for the (30°/−30°) s stacking sequence, in order to compare with the others, except for the (0°) 4 orientation. Residual thermal stresses are particularly important because they can increase the strength of the composite or may lead to premature failure. The residual stress components (σ x ) r are found to be highest at the upper and lower surfaces. When the plastic region expands further with increased temperature, the residual stress components become highest at the elastic-plastic interface.