Tensile Strength of Quasi-Isotropic Composite Laminates

By the classical laminate theory,(±45°/90°/0°)s is a kind of quasi-isotropic composite laminates,and its tensile stiffness in any direction on the plane is equal,while its tensile strength is related to off-axis angle θ.In this paper,the tensile strength of(±45°/90°/0°)s composite laminates is researched when off-axis angle is changed from 0°to 45°.Then the tensile strength and the failure type are researched when the strength constants and material properties of the ply are changed respectively.At last,the research is compared with some experiment results of NCF composite material.