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It is well known that two-layered angle-ply laminates twist under tensile load. Twist angles of the laminates may be calculated by the utilization of so-called lamination theory. The lamination theory is based on Kirchhoff hypothesis for plate bending problems; therefore, restrictions on deformations are imposed. In the present paper twist phenomena of two-layered angleply laminates are analyzed by extending the theory of torsion of bars which is free from the restrictions. The results of numerical calculations show that the twist angles highly depend on the fiber directions and the direction of twist can be plus or minus for certain material properties.

Twist of two-layered angle-ply laminates under tensile load.