Browsing by Author "Singh, K.Shanker"

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Diffusion of water in epoxy composites with different sequential arrangements of woven roving (WR) and chopped strand mat (CSM) reinforcements was studied on immersion in water at 298 K and 323 K. Laminates with CSM as skin layers showed higher diffusivity and equilibrium moisture content than WR as skin layers. The diffusion parameters obtained from the experiment conducted up to saturation limits of 323 K showed good correlation with the data computed using a moisture absorption programme written on lines suggested by G.S. Springer. Hence data at lower temperatures are also generated by using the above programme, thus shortening the time to reach saturation levels.
(Hygrothermal effects on chopped fibre/woven fabric reinforced epoxy composites. Part A. Moisture absorption characteristics) Singh, K.Shanker; Singh, P.N.; Rao, R.M.V.G.K.
1991
Hygrothermal effects on chopped fibre/woven fabric reinforced epoxy composites. Part A. Moisture absorption characteristics
(1991) Singh, K.Shanker; Singh, P.N.; Rao, R.M.V.G.K.
Diffusion of water in epoxy composites with different sequential arrangements of woven roving (WR) and chopped strand mat (CSM) reinforcements was studied on immersion in water at 298 K and 323 K. Laminates with CSM as skin layers showed higher diffusivity and equilibrium moisture content than WR as skin layers. The diffusion parameters obtained from the experiment conducted up to saturation limits of 323 K showed good correlation with the data computed using a moisture absorption programme written on lines suggested by G.S. Springer. Hence data at lower temperatures are also generated by using the above programme, thus shortening the time to reach saturation levels.
Hygrothermal effects on chopped fibre/woven fabric reinforced epoxy composites. Part B. Degradation studies
(1991) Singh, K.Shanker; Singh, P.N.; Rao, R.M.V.G.K.
Studies were conducted on the degradation of short beam shear (SBS) and impact strength (Izod) properties of glass epoxy composite specimens with sequential arrangements of woven roving (WR) and chopped strand mat (CSM) reinforcements, (Figure 1 of Part A) immersed in water at two different temperatures (298 K, 323 K). It was found that composites with higher fibre content, though possesed of a higher initial shear strength, degraded faster than those with low fibre content. This was attributed to a thin resin layer separating the glass layers and a consequential increased surface area around the fibres for the moisture absorption. Further, it was noted that while the impact strength too degraded with exposure period, the degradation patterns are almost identical in all types of laminates within the limits of fibre resin ratio chosen.
Studies were conducted on the degradation of short beam shear (SBS) and impact strength (Izod) properties of glass epoxy composite specimens with sequential arrangements of woven roving (WR) and chopped strand mat (CSM) reinforcements, (Figure 1 of Part A) immersed in water at two different temperatures (298 K, 323 K). It was found that composites with higher fibre content, though possesed of a higher initial shear strength, degraded faster than those with low fibre content. This was attributed to a thin resin layer separating the glass layers and a consequential increased surface area around the fibres for the moisture absorption. Further, it was noted that while the impact strength too degraded with exposure period, the degradation patterns are almost identical in all types of laminates within the limits of fibre resin ratio chosen.
(Hygrothermal effects on chopped fibre/woven fabric reinforced epoxy composites. Part B. Degradation studies) Singh, K.Shanker; Singh, P.N.; Rao, R.M.V.G.K.
1991