Influence of speed of testing and temperature on the behaviour of polyurethane foams
Keywords:polyurethane foams, mechanical testing, microstructure, testing speed, temperature
Polyurethane foams with densities of 35, 93, and 200 kg/m3 were tested in tension and compression at three levels of temperatures as: -60 °C, 23 °C, and 80 °C. The influence of speed of testing from 2 mm/min up to 6 m/s (0.0014 to 545/s) on the response of the foams is analyzed. Testing is done separately on the rise direction and on the in-plane direction of the foams and differences in their behaviour are commented. The variations of the modulus of elasticity, maximum stress at yielding, behaviour in the yielding region, and foam recovery are analyzed showing that they are density, speed of testing, direction of testing, and temperature dependent. For the foam with 200 kg/m3 density the influence of the coating on parallel surfaces – perpendicular to the rise direction – with epoxy or polyester resins is also discussed.
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