Laser Doppler Vibrometer Based Examination of the Efficiency of Introducing Artificial Delaminations into Composite Shells

Open access


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.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • 1. Bolotin V.V. Delaminations in Composites Structures: Its Origin Buckling Growth and Stability. Composites: Part B Engineering 1996; 27(2): 129-145.

  • 2. Bolotin V.V. Mechanics of Delaminations in Laminate Composite Structures. Mechanics of Composite Materials 2001; 3(5/6): 367-380.

  • 3. Clarke M.J. Pavier M.P. Experimental Techniques for the Investigation of the Effects of Impact Damage on Carbon Fiber Composites. Composite Sciences and Technology 1995; 55: 157 - 169.

  • 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. applications/(on-line 30/03/2015)

  • 16. and-marine-2015(on-line 30/03/2015)

Journal information
Impact Factor

IMPACT FACTOR 2018: 1,214
5-year IMPACT FACTOR: 1,086

CiteScore 2018: 1.48

SCImago Journal Rank (SJR) 2018: 0.391
Source Normalized Impact per Paper (SNIP) 2018: 1.141

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 148 73 0
PDF Downloads 84 50 1