A nondestructive approach to predict buckling load of composite lattice-core sandwich conical shells based on vibration correlation technique

IF 3.5 3区材料科学 Q1 ENGINEERING, MECHANICAL

Journal of Sandwich Structures & Materials Pub Date : 2022-08-28 DOI:10.1177/10996362221122020

Mehdi Zarei, G. Rahimi

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引用次数: 1

Abstract

In this paper the vibration correlation technique (VCT) has been used as a nondestructive method for predicting the buckling load of the composite lattice-core sandwich conical shells. This technique is capable of predicting the buckling load of different structures without reaching the failure point through modal testing. The composite lattice-core sandwich conical shell has been fabricated using a filament winding process. To perform the expriment, the fundamental natural frequency of the specimen is measured under stepped axial compression loading. The procedure is followed up without actually reaching the instability point when the structure collapses and is no longer usable. A finite element model has also been built in ABAQUS in order to determine the correlation between natural frequency and applied compressive load. A comparison of the results indicated that the VCT has provided a reliable estimate of the buckling load of composite lattice-core sandwich conical shells, especially when the structure is loaded up to at least 66% of the experimental buckling load and accuracy of the VCT decreases when the maximum load is lower than 43% of the buckling load. Results also revealed that the linear fitted curve is unsuitable for the correlation between frequency of vibration and applied load in order to predict buckling load.

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基于振动相关技术的复合材料格芯夹层锥形壳屈曲载荷无损预测方法

本文将振动相关技术（VCT）作为一种无损方法，用于预测复合材料格构-芯-夹层锥壳的屈曲载荷。该技术能够预测不同结构的屈曲载荷，而不会通过模态试验达到失效点。采用纤维缠绕工艺制备了复合材料格芯夹层锥壳。为了进行实验，在阶跃轴向压缩载荷下测量了试样的基本固有频率。当结构倒塌且不再可用时，在没有实际达到失稳点的情况下，对程序进行了跟进。为了确定固有频率和施加的压缩载荷之间的相关性，还在ABAQUS中建立了有限元模型。对结果的比较表明，VCT对复合材料格构夹芯锥壳的屈曲载荷提供了可靠的估计，尤其是当结构的载荷至少达到实验屈曲载荷的66%时，而当最大载荷低于屈曲载荷的43%时，VCT的精度会降低。结果还表明，线性拟合曲线不适合用于预测屈曲载荷的振动频率和施加载荷之间的相关性。

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

Journal of Sandwich Structures & Materials 工程技术-材料科学：表征与测试

CiteScore

9.60

自引率

2.60%

发文量

审稿时长

7 months

期刊介绍： The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).