Localization of Transversal Cracks in Sandwich Beams and Evaluation of Their Severity
An algorithm to assess transversal cracks in composite structures based on natural frequency changes due to damage is proposed. The damage assessment is performed in two steps; first the crack location is found, and afterwards an evaluation of its severity is performed. The technique is based on a m...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2014/607125 |
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| author | G. R. Gillich Z. I. Praisach M. Abdel Wahab O. Vasile |
| author_facet | G. R. Gillich Z. I. Praisach M. Abdel Wahab O. Vasile |
| author_sort | G. R. Gillich |
| collection | DOAJ |
| description | An algorithm to assess transversal cracks in composite structures based on natural frequency changes due to damage is proposed. The damage assessment is performed in two steps; first the crack location is found, and afterwards an evaluation of its severity is performed. The technique is based on a mathematical relation that provides the exact solution for the frequency changes of bending vibration modes, considering two terms. The first term is related to the strain energy stored in the beam, while the second term considers the increase of flexibility due to damage. Thus, it is possible to separate the problems of localization and severity assessment, which makes the localization process independent of the beams cross-section shape and boundary conditions. In fact, the process consists of comparing vectors representing the measured frequency shifts with patterns constructed using the mode shape curvatures of the undamaged beam. Once the damage is localized, the evaluation of its severity is made taking into account the global rigidity reduction. The damage identification algorithm was validated by experiments performed on numerous sandwich panel specimens. |
| format | Article |
| id | doaj-art-037fc0bfa8de4167a0cd254d0c80bc12 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-037fc0bfa8de4167a0cd254d0c80bc122025-02-03T01:13:04ZengWileyShock and Vibration1070-96221875-92032014-01-01201410.1155/2014/607125607125Localization of Transversal Cracks in Sandwich Beams and Evaluation of Their SeverityG. R. Gillich0Z. I. Praisach1M. Abdel Wahab2O. Vasile3Department of Mechanics, “Eftimie Murgu” University of Resita, P-ta Traian Vuia 1-4, 320085 Resita, RomaniaDepartment of Mechanics, “Eftimie Murgu” University of Resita, P-ta Traian Vuia 1-4, 320085 Resita, RomaniaDepartment of Mechanical Construction and Production, Ghent University, Technologiepark Zwijnaarde 903, 9052 Zwijnaarde, BelgiumDepartment of Mechanics, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, RomaniaAn algorithm to assess transversal cracks in composite structures based on natural frequency changes due to damage is proposed. The damage assessment is performed in two steps; first the crack location is found, and afterwards an evaluation of its severity is performed. The technique is based on a mathematical relation that provides the exact solution for the frequency changes of bending vibration modes, considering two terms. The first term is related to the strain energy stored in the beam, while the second term considers the increase of flexibility due to damage. Thus, it is possible to separate the problems of localization and severity assessment, which makes the localization process independent of the beams cross-section shape and boundary conditions. In fact, the process consists of comparing vectors representing the measured frequency shifts with patterns constructed using the mode shape curvatures of the undamaged beam. Once the damage is localized, the evaluation of its severity is made taking into account the global rigidity reduction. The damage identification algorithm was validated by experiments performed on numerous sandwich panel specimens.http://dx.doi.org/10.1155/2014/607125 |
| spellingShingle | G. R. Gillich Z. I. Praisach M. Abdel Wahab O. Vasile Localization of Transversal Cracks in Sandwich Beams and Evaluation of Their Severity Shock and Vibration |
| title | Localization of Transversal Cracks in Sandwich Beams and Evaluation of Their Severity |
| title_full | Localization of Transversal Cracks in Sandwich Beams and Evaluation of Their Severity |
| title_fullStr | Localization of Transversal Cracks in Sandwich Beams and Evaluation of Their Severity |
| title_full_unstemmed | Localization of Transversal Cracks in Sandwich Beams and Evaluation of Their Severity |
| title_short | Localization of Transversal Cracks in Sandwich Beams and Evaluation of Their Severity |
| title_sort | localization of transversal cracks in sandwich beams and evaluation of their severity |
| url | http://dx.doi.org/10.1155/2014/607125 |
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