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Abstrakty
During its operation, the laminate shell of the watercraft hull can be exposed to local stability losses caused by the appearance and development of delaminations. The sources of these delaminations are discontinuities, created both in the production process and as a result of bumps of foreign bodies into the hull in operation. In the environment of fatigue loads acting on the hull, the delaminations propagate and lead to the loss of load capacity of the hull structure. There is a need to improve diagnostic systems used in Structural Health Monitoring (SHM) of laminate hull elements to detect and monitor the development of the delaminations. Effective diagnostic systems used for delamination assessment base on expert systems. Along with other tools, the expert diagnostic advisory systems make use of the non-destructive examination method which consists in generating elastic waves in the hull shell structure and observing their changes by comparing the recorded signal with damage patterns collected in the expert system database. This system requires introducing certain patterns to its knowledge base, based on the results of experimental examinations performed on specimens with implemented artificial delaminations. The article presents the results of the examination oriented on assessing the delaminations artificially generated in the structure of glass- and carbon-epoxy laminates by introducing local non-adhesive layers with the aid of thin polyethylene film, teflon insert, or thin layer of polyvinyl alcohol. The efficiency of each method was assessed using laser vibrometry. The effect of the depth of delamination position in the laminate on the efficiency of the applied method is documented as well.
Czasopismo
Rocznik
Tom
Strony
75--82
Opis fizyczny
Bibliogr. 16., rys., tab.
Twórcy
autor
- Institute of Aeronautics and Applied Mechanics Faculty of Power and Aeronautical Engineering Warsaw University of Technology, Politechniki 1 Sq. 00-661 Warszawa, Poland
Bibliografia
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- 2. Bolotin V.V. Mechanics of Delaminations in Laminate Composite Structures. Mechanics of Composite Materials, 2001; 3(5/6): 367-380.
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- 4. Dilhac J-M. Smarter. CHIST-ERA Project Seminar, 2013.
- 5. Farrar C. R., Worden K. An Introduction to Structural Health Monitoring. Philosophical Transactions of the Royal Society A, 365 (LA-UR-04-8385), 2007: 303-315.
- 6. Farrar C. R., Worden K. Structural Health Monitoring: A Machine Learning Perspective. John Wiley & Sons, 2012.
- 7. Flynn E.B., Jarmer G.S. High-Speed, Non-Contact, Baseline-Free Imaging of Hidden Defects Using Scanning Laser Measurements of Steady-State Ultrasonic Vibration. International Workshop on Structural Health Monitoring, Stanford, USA, DEStech Publications, Inc. 2013.
- 8. Giurgiutiu, V., (2005) Tuned Lamb Wave Excitation and Detection with Piezoelectric Wafer Active Sensor of Structural Health Monitoring. Journal of Intelligent Material Systems and Structures, 2005; 16(4): 291-305.
- 9. Liu S.F., Hwang G.H. Buckling Behaviour of Composite Laminates with Multiple Delaminations under Uniaxial Compression. Composite Structures, 2001; 53:
- 10. Mouritz A.P., Gellert E., Burchill P., Challis K., Review of advanced composite structures for naval ships and submarines. Composite Structures. Vol. 53(1),2001, pp. 21-42
- 11. Oswald A., Tafreshi T. Global Buckling Behaviour and Local Damage Propagation in Composite Plates with Embedded Delaminations. International Journal of Pressure Vessels and Piping, 2003, Vol. 80.
- 12. Schoeppner N.J., Pagano G.A. Delamination of Polymer Matrix Composites: Problems and Assessment. Comprehensive Composite Materials, Elsevier, 2000.
- 13. Soni C. D., Sahoo P. K., Srinivasan S., Santosh K. Fracture Mechanics Analysis and Strength Prediction of Carbon Fiber Composite Laminate with a Delamination. JEST-M, 2012;1(1): 8-11.
- 14. Wandowski T., Malinowski P., Kudela P., Ostachowicz W. Guided wave–based detection of delamination and matrix cracking in composite laminates. Proceedings of the Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science, 2011; 225: 123-131.
- 15. www.3mb.asia/the-use-of-composite-materials-innautical-applications/(on-line 30/03/2015)
- 16. www.compositesworld.com/articles/the-marketsboatbuilding-and-marine-2015(on-line 30/03/2015)
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-c6dd6d22-a401-428c-aa75-164cef2c88e2