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对薄壁圆柱壳体稳定性的分析计算表明:若对壳体施加由“缠绕”式负荷造成的外部压力,那么壳体的几何形状不会发生通常所观察到的翘曲失稳。用高度张紧的弹性纤维缠绕柱壳,所处平衡状态与纯外压力作用时的一样。这种平衡状态与恒定外压力作用下的平衡状态不同之处在于:该平衡状态是稳定的,并且没有翘曲失稳。作者通过理论分析解释了所得试验结果,并指出结构的稳定性与其自身的材料特性(即弹性、塑性、粘弹性等)无关。因此,可以通过这种方法对薄壁柱壳施加足够大的外部压力以使其断裂或产生均匀屈服。对金属及聚合材料试样所进行的简单实验用以说明这种实验技术的应用。
An analytical calculation of the stability of a thin-walled cylindrical shell shows that if the shell is subjected to external pressure due to a “winding” load, the shell’s geometry does not experience the usual observed buckling instability. The shell is wrapped with highly tensioned elastic fibers in the same equilibrium condition as when pure external pressure was applied. This equilibrium state is different from the equilibrium state under a constant external pressure in that the equilibrium state is stable and there is no warpage instability. The author explains the experimental results obtained through theoretical analysis and points out that the stability of the structure has nothing to do with its own material properties (ie, elasticity, plasticity, viscoelasticity, etc.). Therefore, it is possible by this method to apply a sufficiently large external pressure to the thin-walled cylinder shell to break it or to produce uniform yield. Simple experiments on metal and polymeric materials were used to illustrate the application of this experimental technique.