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A nondestructive method to find the buckling capacity for thin shells

机译:一种非破坏性方法,以找到薄壳的屈曲容量

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The presence of imperfections reduces the load carrying capacities of thin cylindrical shells significantly. This reduction depends on the size and the shape of imperfections-the vital information which is difficult and expensive to obtain. All cylinders contain imperfections in one form or another. And thus, the prediction of their buckling capacities is a daunting task that requires the accurate measurement of the imperfections-a difficult and expensive adventure. Due to the lack of inexpensive high-fidelity prediction method, thin cylindrical shells are designed by the highly conservative knockdown factor approach. Consequently, the full potential of the thin cylindrical shells is not being exploited. Recently, a nondestructive experimental method has been proposed to obtain the buckling capacity of thin cylindrical shells. In this method, lateral probing is utilized to find the post-buckling equilibrium configuration. The load-displacement profile of the probing carries substantial information, which characterizes the response of the imperfect thin cylindrical shells. This information can be used to obtain the buckling capacities of thin cylinders. In this study, we computationally testify this method and assess its practical feasibility. Local dimple-like imperfect thin cylinders are created, and their buckling capacities are found using two methods: the finite element method, and the newly proposed method using lateral probing. By comparing these two results, the accuracy of the proposed method is evaluated. Moreover, the effect of the location, with respect to the dimple, of probing is also investigated. Concomitantly, the interaction of more than one dimple and the lateral probing is explored to understand the fragility of the proposed method.
机译:缺陷的存在显着降低了薄圆柱壳的承载能力。这种减少取决于缺陷的尺寸和形状 - 获得难以获得且昂贵的重要信息。所有气缸含有一种形式或另一种形式的瑕疵。因此,预测其屈曲能力是一种艰巨的任务,需要准确地测量缺陷 - 困难而昂贵的冒险。由于缺乏廉价的高保真预测方法,薄圆柱形壳由高度保守的敲低因子方法设计。因此,不利用薄圆柱形壳的全部电位。最近,已经提出了一种非破坏性实验方法来获得薄圆柱壳的屈曲容量。在该方法中,利用横向探测来找到后屈曲的平衡配置。探测的负载 - 位移轮廓带有大量信息,其表征了透露薄圆柱形壳的响应。该信息可用于获得薄缸的屈曲容量。在本研究中,我们计算地证明了这种方法并评估了其实际可行性。创建了本地凹坑状的不完美薄圆柱,并使用两种方法找到它们的屈曲容量:有限元方法,以及使用横向探测的新提出的方法。通过比较这两个结果,评估所提出的方法的准确性。此外,还研究了对衰弱的位置的位置的效果。伴随着,探讨了多个凹坑的相互作用和横向探测,以了解所提出的方法的脆弱性。

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