温度对T700/3234反对称铺设圆柱壳结构的双稳态特性影响

讨论温度对T700/3234反对称铺设圆柱壳结构的双稳态特性的影响。通过热压固化成型工艺制备了三种不同铺层层数的试样,采用两点加载的方式,使用在现有的拉伸试验机上改装的实验测试平台驱动反对称铺设圆柱壳结构进行稳态转变,持续捕捉实验过程中的数据,得到在20℃,40℃,60℃和80℃温度下的载荷—位移曲线的变化规律及稳态转变载荷。实验后,通过图像处理技术得到曲率和扭曲率等数据。系统分析稳态转变载荷和稳态曲率变化情况,并对存放时间对壳结构的影响进行了讨论。结果表明,温度对双稳态结构稳态转变影响较大,给出了温度对snap-through和snap-back过程的影响规律。

Thermal Effect on Bistable Behaviour of T700/3234 Anti-symmetric Cylindrical Shells

The temperature effects on the bi-stable characteristics of T700/3234 anti-symmetric carbon-fiber composite structure were studied. Three different layup specimens were prepared through composite molding process. The two points loading method was used in the experiment. The modified experimental testing machine ( the experimental testing machine could be used to induce the bistable composite shell to snap between the two stable shapes, and continually capture the data in the experimental process. ) was related to tensile testing machine at present. The load-displacement curvatures under the temperature of 20 ℃,40 ℃,60 ℃ and 80 ℃ were giv-en. The snap load was recorded and the photos were taken in the experimental process. After the experiment, the detailed data of cur-vature and twisting curvature were obtained by image processing technology. The variation law of the coiled-up radius, out-of-plane dis-placement, maximum snap-through and snap-back loads were analyzed. The effect on the composite structure was also discussed. The result shows that the thermal effect is vital to the bistable snaps process, and corresponding influence trends to the snap through and snap back process are given.