The study is focused on thermoset composites reinforced with carbon and glass woven fabrics. Two types of thermoset resins, for example, epoxy and vinyl ester were used as the matrix. Varying concentrations of internal mold releasing (IMR) agent was used in the resin. The composites were cured both at room temperature and at 80°C. The flexural properties were studied using 3‐point bending test method. Further theinter‐laminar shear strength (ILSS) was investigated using the short beam shear strength test based on 3‐point bending. The flexural modulus of room temperature cured epoxy resin is higher than that of high temperature cured epoxy resin and cured vinyl ester resin. The flexural modulus is lowest for 1% IMR sample in epoxy system and the modulus for 0% and 2% epoxy are not significantly different. Lowest flexural strength and modulus can be observed for the combination of reinforcement and curing conditions for samples containing 1% IMR for the epoxy systems. Carbon fiber is found to be less compatible with the vinyl ester resin system and the addition of IMR to the resin degraded the properties further. Inter‐laminar shear strength for epoxy‐based composites is not much affected by presence of IMR, but in case of vinyl ester based composites there is a decrease in ILSS on addition of IMR agent. The study explains variation in flexural properties on addition of IMR and change of curing conditions. These results can be used for ascertaining variation in mechanical properties in real use.

中文翻译：

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内部脱模剂对碳纤维和玻璃纤维增​​强热固性复合材料弯曲和层间剪切性能的影响

这项研究的重点是用碳纤维和玻璃织物增强的热固性复合材料。两种类型的热固性树脂（例如，环氧和乙烯基酯）用作基质。树脂中使用了不同浓度的内部脱模剂（IMR）。将该复合材料在室温和80℃下均固化。使用三点弯曲试验方法研究弯曲性能。使用基于三点弯曲的短梁抗剪强度试验进一步研究了层间抗剪强度（ILSS）。室温固化环氧树脂的挠曲模量高于高温固化环氧树脂和固化的乙烯基酯树脂的挠曲模量。环氧体系中1％IMR样品的弯曲模量最低，0％和2％环氧的模量无显着差异。对于环氧树脂体系中含1％IMR的样品，在增强和固化条件相结合的条件下，可以观察到最低的弯曲强度和模量。发现碳纤维与乙烯基酯树脂体系的相容性较差，并且向树脂中添加IMR进一步降低了性能。IMR的存在对环氧基复合材料的层间剪切强度影响不大，但是在乙烯基酯基复合材料的情况下，添加IMR剂会使ILSS降低。该研究解释了添加IMR和改变固化条件后弯曲性能的变化。这些结果可用于确定实际使用中的机械性能变化。发现碳纤维与乙烯基酯树脂体系的相容性较差，并且向树脂中添加IMR进一步降低了性能。IMR的存在对环氧基复合材料的层间剪切强度影响不大，但是在乙烯基酯基复合材料的情况下，添加IMR剂会使ILSS降低。该研究解释了添加IMR和改变固化条件后弯曲性能的变化。这些结果可用于确定实际使用中的机械性能变化。发现碳纤维与乙烯基酯树脂体系的相容性较差，并且向树脂中添加IMR进一步降低了性能。IMR的存在对环氧基复合材料的层间剪切强度影响不大，但是在乙烯基酯基复合材料的情况下，添加IMR剂会使ILSS降低。该研究解释了添加IMR和改变固化条件后弯曲性能的变化。这些结果可用于确定实际使用中的机械性能变化。该研究解释了添加IMR和改变固化条件后弯曲性能的变化。这些结果可用于确定实际使用中的机械性能变化。该研究解释了添加IMR和改变固化条件后弯曲性能的变化。这些结果可用于确定实际使用中的机械性能变化。