Tarbiat Modares University
Gholamhossein Liaghat has completed his PhD at the age of 29 years (25 years ago) from University of Manchester Institute of science and technology (UMIST), UK and postdoctoral studies from Manchester University. He is professor of mechanical engineering and the director of Impact Mechanics Research Group and Laboratory at Tarbiat Modares University Tehran, Iran and currently visiting professor at Kingston University, London, UK. He has published more than 110 papers in international journals and conferences and serving as an editorial board member of IJCM.
In this study the impact behavior of sandwich panels with syntactic foam core was experimentally investigated. The sandwich panels were similar in facing of woven fabric glass fiber / epoxy matrix composite laminates and with six different types of epoxy based syntactic foams as core. The syntactic foams filled with ceramic microballoons of 0.1 thickness ratio and effective density of 0.7 kg/m3 with three different sizes (80, 130, and180 micron) and three different volume fractions (20 ,40 and 60 percent). The fabricated specimens were tested with a ballistic gas-gun using a light blunt steel projectile. The ballistic limit velocities were measured carefully and the damage mechanisms that absorb energy during the perforation process were considered by exploring the damages of specimens. Although the results showed that with increasing the volume fraction of microballoons the ballistic limit decreases but the panel with 40 % volume fraction of microballoons had the most specific perforation energy. Also, the results indicated that the impact resistance of the panels with syntactic foam core of smaller microballoons became more. A large number of experimental results were presented, compared, discussed and commented upon.