Master of Engineering (Design)
Doctoral Programme (Finite Element Methods)
RESEARCH, TEACHING, or OTHER INTERESTS
Mechanical Engineering
2
Scopus Publications
Scopus Publications
Development of hybrid composite radar wave absorbing structure for stealth applications T ANNIL KUMAR, J INAYATHULLAH, V A NAGARAJAN, S HARI KUMAR Bulletin of Materials Science, 2016 The ideally invisible stealth radomes are usually sandwiched constructions composed of E-glass/epoxy composite, polyvinyl chloride foam and frequency selective surfaces (FSS). Nylon 6/6 and balsa wood are well known for their low dielectric properties. In this work the electromagnetic (EM) wave transmission characteristics of the existing stealth radomes were improved by employing nylon 6/6 fibre and balsa wood, along with E-glass/epoxy composite without compromising the mechanical properties. The free space measurement technique was performed to measure the EM wave transmission characteristics in the X-band frequency range (8.2–12.4 GHz) for a specific FSS. The flexural strength of the sandwiched constructions were investigated with three-point bending test.
A digital image analysis to evaluate delamination factor for wind turbine composite laminate blade V.A. Nagarajan, J. Selwin Rajadurai, T. Annil kumar Composites Part B Engineering, 2012 Kinetic energy of wind is converted into useful power by the rotation of blades that are fabricated using glass fiber reinforced composite. Bolted connections are used to fasten the spares with composite shells of the blades. In order the effect this fastening, holes of appropriate size are drilled in the composite laminates. Drilling in composite material is a common phenomena. However the damage caused in the material during drilling results in a drastical reduction of the performance of the component. A newer quantitative digital measurement model is generated using Buckingham’s π theorem to characterize the damage level, termed as refined delamination factor (FDR). Along with FDR, a comparison of FD and FDA is presented. Experimental results are used to validate the accuracy of proposed criteria.
