Abstract
The dynamic storage and loss shear moduli of dough moulding compounds have been determined as functions of temperature and an attempt is made to correlate them with measurements of fracture energy. For comparison the dynamic moduli of samples of an aligned grp composite are also determined. There is a clear cut damping peak at 90°C which coincides with a transition indicated by a rapid increase in the work of fracture. This is the temperature of the glass transition. A smaller, secondary peak is also observed at about 130°C which appears to coincide with the temperature at which glass fibre bundles in the dmc break down into separate fibres during fracture. The temperature dependence of the shear moduli of dmc is lower than that of aligned grp and the magnitude of the principal damping peak is also considerably lower.
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