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The combined effects of load, moisture and temperature on the properties of E-glass/epoxy composites

机译：载荷，湿度和温度对电子玻璃/环氧树脂复合材料性能的综合影响

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摘要

The properties of an E-glass/epoxy composite were examined before and after mechanical loading and moisture conditioning. Preliminary results indicate that the modulus, strength, and strain of the E-glass/epoxy composite material are affected by the presence of moisture and mechanical loading when compared to control specimens. At shorter durations of conditioning at room temperature, a slight increase in strength and a slight decrease in modulus were observed; and at longer durations, 3000 h, a noticeable reduction in strength and strain-to-failure was observed. Specimens conditioned under stress, in water at 65℃ for 1000 h exhibited higher loss in modulus. It is speculated that constant stress may have a positive effect in short-term, and that extended exposure to moisture at room temperature leads to brittle failure while exposure at high temperatures may lead to ductile failure of E-glass/epoxy composites.
机译：在机械负载和湿度调节之前和之后检查了E-玻璃/环氧树脂复合材料的性能。初步结果表明，与对照样品相比，E-玻璃/环氧树脂复合材料的模量，强度和应变受水分和机械载荷的影响。在室温下进行较短时间的调节时，观察到强度略有增加，模量略有下降。在更长的时间（3000小时）中，观察到强度和断裂应变显着降低。在65℃的水中经过应力处理的试样在1000℃下表现出较高的模量损失。据推测，恒定应力可能会在短期内产生积极影响，室温下长时间暴露于湿气会导致脆性破坏，而高温下暴露则可能导致E-玻璃/环氧树脂复合材料的延性破坏。

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