Baseline-Free Damage Identification Method for Lattice Sandwich Structures Based on Operational Deflection Shapes

IF 1 4区 材料科学 Q3 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
K. Feng, Qian Zhao, Zheng Li
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引用次数: 1

Abstract

ABSTRACT A novel baseline-free damage identification method based on high frequency operational deflection shapes (ODSs) is presented for debonding detection in lattice sandwich structures (LSSs). Two numerical models with different unit cells are constructed to analyze the vibration characteristics of a structure with debonded defect in the high-frequency band. The mode shapes and ODSs are computed numerically to investigate the local defect vibration effects. The results show that there will be obvious local vibration at the damaged location at a certain and appropriate frequency band. A baseline-free damage index calculated from ODSs is originally proposed for damage imaging. For experimental validation, we suggested an intermittent periodic excitation signal for vibration actuating, which may excite multiple ODSs at different frequencies using one measurement that significantly improve the detection efficiency. The experimental results also indicated that the proposed damage identification method is effective to locate the debonding damage in LSSs. The conclusions derived from this study are expected to provide an efficient vibration measurement technique and a practical damage detection method for LSSs, as well as other plate-like structures.
基于工作挠度形状的格子夹层结构无基线损伤识别方法
提出了一种基于高频工作挠度形状(ODSs)的无基线损伤识别方法,用于晶格夹层结构(lss)的脱粘检测。建立了两种不同单元格的数值模型,分析了含脱粘缺陷结构在高频波段的振动特性。数值计算了模态振型和损耗线,研究了局部缺陷振动效应。结果表明,在一定合适的频带内,损伤部位会出现明显的局部振动。最初提出了一种基于ods计算的无基线损伤指数,用于损伤成像。为了实验验证,我们提出了一种间歇周期激励信号用于振动驱动,该信号可以在一次测量中激发多个不同频率的ods,从而显着提高检测效率。实验结果也表明,所提出的损伤识别方法能够有效地定位lss的脱粘损伤。本研究的结论有望为lss及其他类板结构提供一种有效的振动测量技术和实用的损伤检测方法。
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
Research in Nondestructive Evaluation
Research in Nondestructive Evaluation 工程技术-材料科学:表征与测试
CiteScore
2.30
自引率
0.00%
发文量
14
审稿时长
>12 weeks
期刊介绍: Research in Nondestructive Evaluation® is the archival research journal of the American Society for Nondestructive Testing, Inc. RNDE® contains the results of original research in all areas of nondestructive evaluation (NDE). The journal covers experimental and theoretical investigations dealing with the scientific and engineering bases of NDE, its measurement and methodology, and a wide range of applications to materials and structures that relate to the entire life cycle, from manufacture to use and retirement. Illustrative topics include advances in the underlying science of acoustic, thermal, electrical, magnetic, optical and ionizing radiation techniques and their applications to NDE problems. These problems include the nondestructive characterization of a wide variety of material properties and their degradation in service, nonintrusive sensors for monitoring manufacturing and materials processes, new techniques and combinations of techniques for detecting and characterizing hidden discontinuities and distributed damage in materials, standardization concepts and quantitative approaches for advanced NDE techniques, and long-term continuous monitoring of structures and assemblies. Of particular interest is research which elucidates how to evaluate the effects of imperfect material condition, as quantified by nondestructive measurement, on the functional performance.
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