By Edited by Arshad Munir Zaffar M. Khan
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Heating up to180°C at 4°C/min 2. Isothermal step for 10min at 180°C 3. Cooling to 20°C at 4°C/min. 4. Isothermal step for 10 min. The acquisition system records the temperatures given by the six thermocouples with respect to a cold junction (its temperature is recorded) and the signal of the displacement sensor. After data treatment the total heat flux density and the thickness variation are obtained. However, they have to Arshad Munir and Zaffar M. Khan 23 be reprocessed to take into account possible heat losses of the mould but also thermal expansion of the LVDT sensor, the elastomer and the mould.
068. 26 Advanced Materials for Applied Science and Technology Fig. 7. Variation of chemical shrinkage of composite with degree of cure for different fibre fractions Cure shrinkage of composites For making composite, glass fabric of 300 g/m² was used to prepare12 and 16 circular plies resulting in 20 and 31% fibres by volume, respectively. The resin was injected into a capsule manually filled with the fabric plies. PVT-α experiment were done using the same curing cycle as the one previously detailed for neat resin.
This can be understood by considering both the curves of displacement and conversion degree. At the beginning (A-B part), the displacement curve is linear versus temperature. The chemical reaction does not start yet or is not very significant. So the slope of graph in this region will give . 10 °K . In the region between the points B and C, a phenomenon of chemical shrinkage due to significant cure of resin (see the conversion degree curve) also appears in addition to thermal expansion and tends to decrease the final thickness till the point C where the resin is close to be fully cured.