Design of Bezier curve variable angle laminates and analysis on buckling property

Based on quadratic Bezier curve, research on buckling property of laminates produced by fiber variable angle placement was studied. Firstly, a segmental quadratic Bezier curve fitting method was proposed by extending the original quadratic Bezier curve theory to redefine the reference path of fiber variable angle placement and determine the parameterized expression of the laminates laid according to variable angle. Secondly, taking the laminates laid by variable angle of [0±<20(β)65>]_2s and [90±<20(β)65>]_2s as examples, the buckling properties were analyzed through FEM method. And the comparison analysis with the buckling property of the laminates laid by constant angle was conducted. Finally, the influences of termination angles α and connecting point parameter β on the buckling property were studied. The results show that the linear buckling load of these two kinds of variable stiffness laminates first increases then decreases as β increases. And it is also found that the buckling load of first order increases gradually when the termination angle is larger than the initial angle, which indicates that increasing the placement angle is beneficial to improving the buckling load of the laminates.