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基于二次Bezier曲线法,开展纤维变角度层合板的屈曲特性研究。首先,对原始的二次Bezier曲线进行了扩展,提出了分段式二次Bezier曲线变化方法,重新定义了纤维变角度铺放参考路径,确定了变角度层合板的表示形式。其次,以[0±<20(β)65>]_(2s)和[90±<20(β)65>]_(2s)为例对变角度层合板的屈曲特性进行了有限元分析,并与定角度层合板对比。最后,研究了不同终止角α和连接点参数β对层合板屈曲性能的影响,结果表明:连接点参数β的增大使得两种变刚度层合板的线性屈曲载荷先增大后减小,终止角大于起始角时,层合板的一阶屈曲载荷逐渐增大,铺放角度的增大有利于层合板屈曲载荷的提高。
Buckling Characteristics of Fibrous Variable Angle Laminated Plates Based on Quadratic Bezier Curve Method. Firstly, the original quadratic Bezier curve is extended. The method of subdivision quadratic Bezier curve is proposed. The reference path of fiber changing angle is redefined, and the representation of variable angle laminates is determined. Secondly, the finite element analysis of the buckling behavior of the variable angle laminates was carried out with [0 ± 20 (β) 65>] (2s) and [90 ± 20 (β) 65>] And compared with the fixed angle laminates. Finally, the effect of different terminal angle α and connection parameter β on the buckling behavior of the laminates was studied. The results show that the increase of the parameter β of the join point makes the linear buckling load of the two kinds of laminations increase, then decrease and terminate When the angle is larger than the initial angle, the first-order buckling load of the laminate gradually increases, and the increase of the laying angle is beneficial to the improvement of the buckling load of the laminate.