Abstract: The focus of current investigation is on adhesively bonded joints of glass/epoxy skin- rigid unfilled thermoset foam core material sandwich composite structures to study their shear failure properties. Rigid foam cores of Polyurethane (PUF) or Polyisocyanurate (PIR) of four different densities – 64,125,250 and 500 kg/m3 were used with uniform thicknesses. Plain weave glss fabric and a room temperature epoxy GY 257 withA140 hardener were used for the skin design. The lap shear and peel test specimens were prepared by vacuum bagging technique. The double lap shear properties were compared with the single lap shear properties evaluated earlier and a detailed comparative analysis was made on the influence of different foam densities and their adhesion to the skin on the failure behaviour of otherwise i

• Publication Date: 25-May-2014
• DOI: 10.15224/978-1-63248-028-6-03-63
• Views: 0
• Downloads: 0

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 ba

• Publication Date: 25-May-2014
• DOI: 10.15224/978-1-63248-028-6-03-64
• Views: 0
• Downloads: 0