Non-destructive buckling load estimation of oblate ellipsoidal domes using the vibration correlation technique

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2024-10-28 DOI:10.1016/j.tws.2024.112612

Gopikrishna R. , G. Raju , Ramkrishna D.

引用次数: 0

Abstract

In this paper, experimental and numerical studies based on the vibration correlation technique (VCT) are employed to non-destructively determine the buckling load of oblate ellipsoidal domes subjected to external pressure loading. Two nominally identical isotropic oblate ellipsoidal domes are fabricated, and experiments are conducted using specially designed fixtures and a hydraulic system for applying pressure. The dome’s deformation, strains, and modal response are measured at different pressure loads and analyzed. Conventional and modified VCT approaches are used to evaluate the buckling load. The experimental buckling results are compared with VCT predictions and the effect of various factors like mode number of interest, reference natural frequency, number of data points, and reference critical buckling load are studied. The results from this work serve as a validation for the applicability of VCT in predicting the buckling load of oblate ellipsoidal dome structures.

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利用振动相关技术对扁平椭圆形穹顶的屈曲载荷进行非破坏性估算

本文采用基于振动相关技术（VCT）的实验和数值研究，非破坏性地确定了扁球形椭圆穹顶在外部压力加载下的屈曲载荷。制作了两个名义上完全相同的各向同性扁球形椭圆穹顶，并使用专门设计的夹具和液压系统施加压力进行了实验。在不同的压力负荷下，对穹顶的变形、应变和模态响应进行了测量和分析。采用传统和改进的 VCT 方法来评估屈曲载荷。实验屈曲结果与 VCT 预测结果进行了比较，并研究了相关模态数、参考固有频率、数据点数量和参考临界屈曲载荷等各种因素的影响。这项工作的结果验证了 VCT 在预测扁椭圆形穹顶结构屈曲载荷方面的适用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.