Influence of foam densities and span to depth ratios on the Flexural properties of rigid polyisocyanurate foam-glass fabric/epoxy Sandwich Composites

RAMYA M,, SURESH E and PADMANABHAN, K and VISHAKH, V (2014) Influence of foam densities and span to depth ratios on the Flexural properties of rigid polyisocyanurate foam-glass fabric/epoxy Sandwich Composites. In: https://www.seekdl.org/conferences/paper/details/3747.html, 24 - 25 May, 2014, RIT, Roorkee, India.

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Abstract

The experimental investigation here focuses on the study of flexural and shear properties of sandwich composites. Rigid unfilled thermoset Polyisocyanurate (PIR) foam is used as the core material and glass fabric reinforced epoxy based laminates are used as the outer skin layers of the sandwich. PIR foams with densities of 125kg/m3 and 250kg/m3 are used for the study. Skin to core weight ratios of 3:1 and 4:1 were maintained for the panels fabricated separately with the vacuum bagging technique. Specimens with varying span to depth ratios of 16:1, 12:1 and 6:1 were tested using an Instron UTM machine. The investigation follows a three-point bending test method carried out for finding bending strength, flexure rigidity, shear deflection, shear stress, shear strain etc. The test results were compared and analyzed in depth to find the influence of the core density and span to depth ratios on the flexural and shear properties of the sandwich composite. Useful conclusions have been drawn based on the fracture behaviour of these sandwich composites.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Rigid polyisocyanurate foam, Flexural properties, Sandwich composites, Foam Density, Span to depth ratios.
Depositing User: Mr. John Steve
Date Deposited: 24 May 2019 12:31
Last Modified: 24 May 2019 12:31
URI: http://publications.theired.org/id/eprint/2661

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