Analysis of thermal-elastic coupling vibration of large deflection cylindrical shell

The governing equation and energy equations for thermal-elastic coupling vibration of cylindrical shell were developed. The Garlerkin method was used in numerical process. Some useful result can be concluded from numerical result. With the increase ofthe amplitude of temperature and coupling coefficient, the speed of vibration decaying becomes slower and the coupling effect becomes weaker. The larger the ration of length to radius and length to thickness, the faster the decaying of the vibration amplitude and the vibration frequency increase. It means the coupling effect gets stronger. The larger the coupling coefficient, the smaller the axial stress, the axial force and the bendind moment are.     

多跨薄壁压力管道侧向冲击破坏的实验研究

对三跨连续压力管道侧向受平头、半球头及锥头弹体冲击破坏进行了实验研究,获得了不同工况下的临界破坏速度及相应的破坏模式,实验过程中测量并记录了薄壁圆管的变形、冲击力时程曲线及内充液体的压力变化。实验结果表明,内充介质的存在极大地降低了临界破坏速度,同时临界破坏速度随内充介质压力的增加而减小。     

大挠度圆柱壳在温度场中的热弹耦合振动分析

对温度场与与应力场耦合时的圆柱壳的非线性热弹耦合的振动问题,推导得到了基本的振动方程,热传导方程和协调方程,对短圆柱壳运用伽辽金(Galerkin)法求解,得出振幅随时间变化的数值解,得到一些有价值的结论．即随着温度幅值和耦合系数的增大,振动衰减的速度变缓,热弹耦合效应减弱．随着长径比、长厚比的增大,振幅衰减的速度变快,同时热振动频率也随之增大,即热弹耦合效应增强．耦合系数越大,轴向应力、轴向力以及轴向弯矩越小．