Authors: Okite Obakponovwe J G Williams
Publish Date: 2006/01/01
Volume: 41, Issue: 2, Pages: 437-443
Abstract
The modulus and fracture toughness of an ATHfilled PMMA composite are determined as a function of temperature The modulus can be modelled as a series addition of the two phases giving a decreasing modulus with temperature tending to zero at 110°C The K1C value remains constant Fatigue crack growth data in the form of da/dN versus K were obtained as a function of temperature and modelled using the Paris Law The power index remained constant at 75 but the coefficient had a maximum at 50°C It is suggested that this arises from microcracks generated by interparticle thermal stresses which are shown to have a maximum at the same temperature 50°C A twostage zone fatigue crack growth model was also applied to the data and gave a damage stress which correlated with the thermal stress and suggested a criterion based on achieving a constant energy per unit area
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