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两参数轴向冲击载荷作用下圆柱壳弹塑性动力屈曲

DYNAMIC BUCKLING OF ELASTIC-PLASTIC CYLINDRICAL SHELLS UNDER AXIAL TWO PARAMETERS IMPULSIVE LOADING

  • 摘要: 研究圆柱壳在两参数轴向冲击载荷下的弹塑性动力屈曲问题,基本控制方程由弹塑性连续介质中关于加速度的最小原理获得,本构关系采用增量理论。研究表明:屈曲过程可划分为两相,两相之间由临界时间t表征,并分别讨论了应力波对屈曲的影响,压缩波与弯曲波的相互作用及几何尺寸,材料参数,初始缺陷,载荷峰值及持续时间等诸多因素与动力屈曲的关系。

     

    Abstract: The inelastic dynamic buckling of cylindrical shells under axial two parametersimpulsive loading is discussed. The basic equations of structure are derived from a minimumprinciple in dynamics of elastic-plastic continua at finite deformation and the flow theoryof plasticity is employed. Two phases(a pre-critical and post-critical phase)can be distin-guished at an early stage of dynamic buckling of inelastic shell.The effects of peak valueand during time of loading, initial imperfections, geometric dimension...

     

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