Abstract
The object of this study was to evaluate the flexural strength of glass fiber reinforced polyurethane composites under variable displacement rates. Flexural tests have been conducted at a range of displacement rates included 0.2, 2, 20, 100, 200, 1000 mm/min. Specimens with identical geometry have been used in all the tests. This particular composite has viscoelastic behavior with both elasticity modulus and ultimate flexural strength being strongly dependent of the displacement rate. Results showed that, both the flexural modulus and the ultimate flexural strength are increased with the increasing in the displacement rate.
Highlights
Glass-fiber reinforced plastic (GFRP) laminates are used as lightweight materials in a wide variety of commercial and military structures as well as in sporting equipment
Quasi-static and high displacement rate flexural tests were performed on glass fiber reinforced polyurethane
The experimental analysis shows that the mechanical response of this composite is strongly displacement rate dependent
Summary
Glass-fiber reinforced plastic (GFRP) laminates are used as lightweight materials in a wide variety of commercial and military structures as well as in sporting equipment. For example, GFRP is used in cargo, passenger, naval ships, surfboards, canoes and racing yachts, small submersibles, on the fins and fairings of submarines, and on off-shore oil drilling platforms 1, 2. The thermoset polyurethanes are a class of polymer materials with desirable properties, such as high abrasion resistance, tear strength, excellent shock absorption, flexibility and elasticity 3-5. It is a polymer composed of a chain of organic units joined by carbamate (urethane) links most commonly formed by reacting a di- or polyisocyanate with a polyol. Both the isocyanates and polyols used to make polyurethanes contain on average two or more functional groups per molecule 6-8
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