Open Access Open Access  Restricted Access Subscription Access

Experimental Investigation of modal parameters of pre and post impact damaged composite laminates

Sachin K. Patil, Avinash Kumar K M, Ramesh S Sharma


Composite materials are preferred over the traditional engineering materials due to their low density, high strength to weight ratio, have high flexural rigidity, fatigue resistance and excellent damping properties. Damping properties of laminated composites depend on the fiber orientation, stacking sequence, volume fraction etc. Every composite component is subjected to a host of different variety of loads, inducing a wide range of vibrations under different boundary conditions. The damping properties are affected in such conditions. In thispaper, the modal properties of a bidirectional GFRP plate having unit aspect ratio are estimated using experimental modal analysis for F-F-F-F and C-F-F-F boundary conditions for pre and post impact damage scenarios. The damping ratio of the specimen for F-F-F-F boundary condition increases after induction of damage. For C-F-F-F boundary condition, however, damping ratio decreases as the mode number increases, reaches a minimum value for fifth mode and increases for higher modes. This particular damping behaviour of the material is very difficult to interpret and the mechanics involved in affecting the damping properties have to be revisited.


Full Text:



Treviso, B. Van Genechten, D. Mundo, M. Tournour, “Damping in composite materials: Properties and models”, Composites Part B (78), 2015, pg. 144-152

R. Chandra, S.P. Singh, and K. Gupta. Damping studies in fiber-reinforced composites-a review. Composite Structure, vol.46, pp41–51, 1999.

J. Alexander, B.S.M. Augustine, “Free Vibration and Damping characteristics of GFRP and BFRP Laminated Composites at Various Boundary Conditions”, Indian Journal of Science and Technology, Vol. 8(12), DOI: 10.17485/ijst/2015v8i12/54208, June 2015

J. Alexander, HastonAmit Kumar, Dr.Bsm Augustine, “Frequency Response of Composite Laminates at Various Boundary Conditions”, International Journal of Engineering Science Invention, ISSN(print): 2319-6726, pg. 11-15

ZekiKıral, Bülent Murat Içten, BinnurGörenKıral, “Effect of impact on damping characteristics of beam-like composite structures”, Composites Part B (43), 2012, pg. 3053-3060

Ricardo de Medeiros, MuriloSartorato, FlavioDonizeti Marques, VolneiTita, Dirk Vandepitte, “Vibration - based Damage identification applied for composite plate: Experimental analyses”, 22nd International Congress of Mechanical Engineering (COBEM 2013), ISSN: 2176-5480

Marco A Perez, Lluis Gil, SegioOller, “Impact damage identification in composite laminates using vibration testing”, Composite Structures 108 (2014), pg. 267-276

Ronald F Gibson, “Modal vibration response measurements for characterization of composite materials and structures”, Composites Science and Technology 60 (2000), pg. 2769-2780

Cynthia A Bourne, “Material Damping as a means quantifying fatigue in composites”, Thesis presented to Air force Institute of Technology, Air University (ATC), 1978

Ramesh S Sharma, V P Raghupathy, “Experimental Modal Analysis of Sandwich Panels with Rigid inserts” International Journal of Material Science, Vol.2, No.3, 2007,pp. 275–281


  • There are currently no refbacks.