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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.5: High-Pressure Technology... >PLASTIC INSTABILITIES IN SPHERICAL SHELLS UNDER LOAD, DISPLACEMENT, AND IMPULSIVE LOADING
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PLASTIC INSTABILITIES IN SPHERICAL SHELLS UNDER LOAD, DISPLACEMENT, AND IMPULSIVE LOADING

机译：载荷，位移和脉冲载荷下球壳的塑性不稳定性

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摘要

Plastic instabilities that could potentially develop in spherical shells under a variety of symmetric loading conditions are examined. First, a literature survey of both static and dynamic instabilities associated with spherical shells is presented, with emphasis on plastic tensile instability. Then, building upon work done elsewhere for cylindrical shells, a plastic instability condition for spherical shells subjected to displacement controlled and impulsive loading is developed and compared with earlier results reported in the literature. It is found that the instability point for displacement controlled loading and impulsive loading of a spherical shell is the same as for a uniaxial tension specimen and for an impulsively loaded plane-strain ring/cylinder. In addition, a simple, one-dimensional strain-softening model is developed that investigates the relationship between instabilities associated with displacement-controlled loading and impulsive loading.Conclusions of this work are that there are two fundamental types of instabilities associated with failure of spherical shells: local and global. Moreover, the local instability, associated with failure under displacement control and impulsive loading, is found to require an imperfection to develop, whereas the global instability does not require an imperfection. The need for experiments to verify these results is discussed.
机译：研究了在各种对称载荷条件下球形壳中可能产生的塑性不稳定性。首先，介绍了与球形壳体相关的静态和动态不稳定性的文献综述，重点是塑性拉伸不稳定性。然后，以圆柱壳的其他工作为基础，开发了受位移控制和脉冲载荷作用的球形壳的塑性不稳定性条件，并将其与文献中报道的早期结果进行了比较。发现球形壳体的位移控制载荷和脉冲载荷的不稳定性点与单轴拉伸试样和脉冲载荷的平面应变环/圆柱体的不稳定性点相同。此外，建立了一个简单的一维应变软化模型，研究了与位移控制载荷和脉冲载荷相关的不稳定性之间的关系。这项工作的结论是，与球壳破坏相关的不稳定性有两种基本类型：本地和全球。此外，发现与位移控制和脉冲载荷作用下的破坏相关的局部不稳定性需要完善的缺陷，而整体不稳定性则不需要完善的缺陷。讨论了需要实验来验证这些结果。

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