Figure 7. Experimental results for steel, foam, aluminium and gel layers (circular cross section)

From

Free Vibration Studies of Woodpecker Inspired Layered Shock Absorbing Structure

Dr. B Biju, Anandu Ramesh, Aparna R Krishnan, Aravind G Nath, Christy Francis N J

Journal of Mechanical Design and Vibration. 2019, 7(1), 16-20 doi:10.12691/jmdv-7-1-2