International Journal of Impact Engineering, Volume 57, July 2013, Pages 108-118.
Muhammad Rahman, Mahesh Hosur, Shaik Zainuddin, Uday Vaidya, Arefin Tauhid, Ashok Kumar, Jonathan Trovillion, Shaik Jeelani.
Department of Mechanical Engineering, Tuskegee University, Tuskegee, AL 36088, USA and
Department of Materials Science and Engineering, Tuskegee University, Tuskegee, AL 36088, USA and
Department of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA and
U. S. Army Construction Engineering Research Laboratory, Champaign, IL 61821-9005, USA.
Effect of adding amino-functionalized multi-walled carbon nanotubes (NH2-MWCNTs) on the ballistic performance of E-glass/epoxy composites was investigated in this study. E-glass/epoxy panels were prepared with and without MWCNTs. Two different weight percentages of 0.3 and 0.5% MWCNTs were used to modify the epoxy resin. MWCNTs were dispersed in epoxy resin through a combination of sonication and 3-roll mill methods. Laminated composite panels with E-glass plain weave fabrics were made through hand lay-up followed by compression molding process. Samples of size 120 × 120 × 5.25 mm were then cut from the panels and subjected to spherical projectile impacts using a gas-gun set-up at different velocities to determine the ballistic limit velocity (VBL). Additionally, ballistic limit velocity was statistically determined through polynomial and power regression using experimental results. Ballistic limit increased by about 15–19 m/s (5–6.5%) for laminates with 0.3 wt.% MWCNTs. On the other hand, the performance of laminates with 0.5 wt.% MWCNTs was comparable with that of control samples. Damage size as determined by ultrasonic c-scan studies was considerably less for the laminates with MWCNTs at a given impact velocity below and above ballistic limit.