反对称铺层碳纤维复合材料圆柱壳的双稳态应力特性

Stress characteristics of bi-stable cylindrical shells with anti-symmetric laminated carbon fiber composite

双稳态复合材料可广泛应用于各类可变结构的设计。针对反对称铺层的圆柱壳,利用有限元软件ABAQUS的Standard准静态分析,模拟其双稳态跳变过程和跳回过程,探讨在整个连续过程中圆柱壳上的应力分布情况,以及应力随时间和载荷变化的趋势,从而对该类可变结构的设计起到指导作用。结果表明:该类复合材料圆柱壳跳变过程中最大应力出现在载荷施加点与约束点附近,第二稳态下应力关于板中心呈中心对称分布,最大应力沿板壳对角线出现在四个角内侧附近,而跳回过程中应力由第二稳态下的分布慢慢变为集中在约束点附近。而且整个圆柱壳上的最大应力时刻与最大载荷施加的时刻不重叠,具有滞后性。

The bi-stable composite materials can be widely used in the design of variable structures.Using ABAQUS/Standard(version 2018),a finite element analysis of the shell′s snapping process was conducted to simulate the snap-through process and snap-back process of the bi-stable cylindrical shells with anti-symmetric laminated carbon fiber composites.The distribution and trend of the stress on the cylindrical shell during the whole continuous process were discussed to give advice to the design of this type of variable structure.The results show that the stress distribution of the composite cylindrical shells is very different during the snap-through process,the snap-back process and the second stable state.Moreover,the maximum stress moment on the entire cylindrical shell does not overlap with the moment when the maximum load is applied,and has hysteresis.