Probing the stability landscape of cylindrical shells for buckling knockdown factors.
Probing the stability landscape of cylindrical shells for buckling knockdown factors.
复制标题
探测圆柱形壳的稳定性景观，以替代敲击因子。
DOI：
10.1098/rsta.2022.0032
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发表时间：
2023-04-03
期刊：
影响因子：
5
通讯作者：
Pirrera, A.
中科院分区：
文献类型：
--
作者：
Groh, R. M. J.;Pirrera, A.
轴向压缩圆柱壳的屈曲响应以其不完全敏感性而著称。通过局部探测绘制稳定景观最近被提出作为建立壳体屈曲击倒因子的一种合理手段。利用径向向内且垂直于圆柱体壁的点力探测是基于这样一种认识，即在稳定的预屈曲平衡的盆地边界存在一个局部的单韧窝作为边缘状态。在这里，我们将探测的思想扩展到双向向内和向外的力，以触发单窝和双窝边缘状态。我们确定了随后探测稳定性景观的关键特征，并对这些特征进行了概括，得出了三个不同保守性的设计曲线，它们仅是无维Batdorf参数的函数。有趣的是，三种击倒曲线中最保守的是来自下方的大量实验屈曲结果数据集，尽管这些数据来自几何完美圆柱体的探测特征。总的来说，三种设计曲线允许比传统击倒因素更细致的设计方法，因为可以根据预期的制造质量选择不同的保守性水平。例如，对于最细长的圆柱体几何形状，三个设计准则中最保守和最不保守的设计准则相差3倍，相关的安全系数降低对有效的结构设计具有深远的影响。这篇文章是主题问题“探测和动态的冲击敏感炮弹”的一部分。
The buckling response of axially compressed cylindrical shells is well known for its imperfection sensitivity. Mapping out a stability landscape by localized probing has recently been proposed as a rational means for establishing shell buckling knockdown factors. Probing using a point force directed radially inwards and perpendicular to the cylinder wall is based on the insight that a localized single dimple exists as an edge state in the basin boundary of the stable prebuckling equilibrium. Here, we extend the idea of probing to bi-directional inwards and outwards forces to trigger both single-dimple and double-dimple edge states. We identify key features of the ensuing probing stability landscape and generalize these to derive three design curves of varying conservatism that are a function of the non-dimensional Batdorf parameter only. Interestingly, the most conservative of the three knockdown curves bounds a large dataset of experimental buckling results from below, despite being derived from probing features of geometrically perfect cylinders. Overall, the three design curves permit a more nuanced design approach than legacy knockdown factors, as different levels of conservatism can be chosen based on expected manufacturing quality. For instance, the most and least conservative of the three design guidelines differ by a factor of 3 for the most slender cylinder geometries, and the associated reduction in safety factor has profound implications for efficient structural design. This article is part of the theme issue ‘Probing and dynamics of shock sensitive shells’.
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影响因子：
2.4
作者：
Groh, Rainer M. J.;Pirrera, Alberto
通讯作者：
Pirrera, Alberto
影响因子：
6.4
作者：
Ankalhope, Suhas;Jose, Sandeep
通讯作者：
Jose, Sandeep
DOI：
10.1115/1.3564582
发表时间：
1969-01-01
期刊：
JOURNAL OF APPLIED MECHANICS
影响因子：
--
作者：
ARBOCZ, J;BABCOCK, CD
通讯作者：
BABCOCK, CD
影响因子：
6.4
作者：
Evkin, A.
通讯作者：
Evkin, A.
DOI：
10.1016/j.ijmecsci.2021.106297
发表时间：
2021-01-29
影响因子：
7.3
作者：
Groh, R. M. J.;Hunt, G. W.;Pirrera, A.
通讯作者：
Pirrera, A.