Strain Rate Dependent Behavior of Glass/Nano Clay Filled Epoxy Resin Composite

  • R. Velmurugan Indian Institute of Technology Madras, Chennai
  • S. Gurusideswar Indian Institute of Technology Madras, Chennai
Keywords: Hybrid composites, Nano clays, Mechanical properties, Fractography, Scanning electron microscopy

Abstract

It is believed that addition of small amount of nanoclays in the neat epoxy and fiber reinforced epoxy composite system can improve the mechanical properties. The mechanical properties of most of polymer matrix composites are sensitive to testing rate. However, most of the researches were concentrated on the behavior of the polymer
matrix composites at high strain rates. The present research work is to investigate the role of clay on neat epoxy and glass–fiber reinforced epoxy composites, at low strain rates. The clay in terms of 1.5 wt%, 3 wt%, and 5 wt% are dispersed in the epoxy resin using mechanical stirring followed by sonication process. The corresponding glass/epoxy nanocomposites are prepared by impregnating the clay epoxy mixture by hand lay-up process. Characterization of the nanoclay is done by X-ray diffraction and Scanning Electron Microscopy. Tensile stress-strain curves are obtained at strain rates of 10-4 s-1, 10-3 s-1, 10-2 s-1, and 10-1 s-1 by a hydraulic  machine reporting that, even at low strain rates, the longitudinal strength and stiffness increase as strain rate increases for all clay loadings. It is observed that the tensile modulus increases as the clay loading increases for both epoxy and glass/epoxy nanocomposites. It is also noticed that the longitudinal tensile strength decreases as the clay loading increases. The failed specimens show marked changes in the fracture surface with increased strain rate. Scanning electron microscopy is used to study the fiber/matrix/clay adhesion in fracture surfaces.

Defence Science Journal, Vol. 64, No. 3, May 2014, pp. 295-302, DOI:http://dx.doi.org/10.14429/dsj.64.7331

Author Biographies

R. Velmurugan, Indian Institute of Technology Madras, Chennai
Dr R. Velmurugan, PhD, is a Professor in the Department of Aerospace Engineering at Indian Institute of Technology Madras, Chennai. He teaches courses on aerospace structural mechanics, composite structures, impact mechanics and structural design. His research interest includes impact mechanics, composite materials, FE Analysis,  nanomaterials.
S. Gurusideswar, Indian Institute of Technology Madras, Chennai
Mr S. Gurusideswar, M E, is pursuing Ph D in the Department of Aerospace Engineering at Indian Institute of Technology Madras, Chennai. His research interests include composite structures, nanocomposites, strainrate sensitivity and environmental effectson composites, digital image correlation technique.
Published
2014-05-20
How to Cite
Velmurugan, R., & Gurusideswar, S. (2014). Strain Rate Dependent Behavior of Glass/Nano Clay Filled Epoxy Resin Composite. Defence Science Journal, 64(3), 295-302. https://doi.org/10.14429/dsj.64.7331
Section
Special Issue Papers