A New Approach for Severity Estimation of Transversal Cracks in Multi-layered Beams

Abstract Nowadays, the damage severity evaluation in mechanical structures is mostly performed by analyzing the natural frequency shift. The non-isotropic materials, as the multi-layered ones, are wide-spread in industrial applications, due to their interesting physic-mechanical properties. Thus, a...

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Bibliographic Details
Published inLatin American journal of solids and structures Vol. 13; no. 8; pp. 1526 - 1544
Main Authors Gillich, Gilbert-Rainer, Maia, Nuno M. M., Mituletu, Ion-Cornel, Tufoi, Marius, Iancu, Vasile, Korka, Zoltan
Format Journal Article
LanguageEnglish
Portuguese
Published Associação Brasileira de Ciências Mecânicas 01.08.2016
Marcílio Alves
Subjects
Damage localization
Damage severity
ENGINEERING, CIVIL
ENGINEERING, MECHANICAL
MECHANICS
Multi-layered beam
Natural frequency shift
Stored energy
Vibration-based damage detection
Multi-layered beam
Natural frequency shift
Damage severity
Vibration-based damage detection
Damage localization
Stored energy
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Summary:Abstract Nowadays, the damage severity evaluation in mechanical structures is mostly performed by analyzing the natural frequency shift. The non-isotropic materials, as the multi-layered ones, are wide-spread in industrial applications, due to their interesting physic-mechanical properties. Thus, a deeper approach of multi-layered beams becomes an important request in the research domain. This paper introduces a damage severity estimator by expressing the crack evolution as a function of stored energy. It is well known that the energy stored in a beam without damage is greater than the energy of that damaged beam. As a consequence, the beam deflection can be related to the stored energy. In this regard, the possibility to split the damage localization and the damage severity assessment has been proven, and also the graphical evolution of the natural frequency shift has been achieved as a function of the crack depth. The results achieved by the finite element method (FEM) and experimental tests are given in tables and graphics. For the first five vibration modes, a comparison was made between frequencies accomplished by analytical, numerical and experimental analyses, in order to give more credibility to the accuracy of the research data presented in this paper.
ISSN:1679-7825
1679-7825
DOI:10.1590/1679-78252541