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- 2015
海水浸泡对单向T700/环氧复合材料层间剪切性能的影响
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Abstract:
对海水环境下严重影响单向T700/环氧复合材料层间剪切性能的因素进行了研究,考察了海水和蒸馏水5个浸泡周期(15、40、70、165和400 d)后单向T700/环氧复合材料层间剪切性能和吸水率的变化,并利用SEM观测了单向T700/环氧复合材料的剪切断口微观形貌,揭示其性能衰减机制。结果表明:单向T700/环氧复合材料的吸水率随着浸泡时间的延长而增加,整体符合Fick吸水率变化规律;单向T700/环氧复合材料的层间剪切性能下降很明显,浸泡400 d后层间剪切性能损失近10%,层间剪切性能的变化规律与吸水率的变化规律相似;单向T700/环氧复合材料的层间剪切性能对海水的敏感性大于对蒸馏水的敏感性;由试样断面微观形貌可以看出,海水的渗入破坏了树脂与纤维的界面,这是导致其层间剪切性能明显下降的主要原因,因此对于单向T700/环氧复合材料在海水中的应用,需要更加关注其层间剪切性能。 The factors that seriously affect the interlaminate shear properties of unidirectional T700/epoxy composites in seawater environment were studied, as well as the variation of interlaminate shear properties and water adsorption ratio of unidirectional T700/epoxy composites immersing in seawater and distilled water after five immersing periods(15, 40, 70, 165 and 400 d). The shear fracture microstructures of unidirectional T700/epoxy composites were observed by SEM to reveal the mechanism of propertiy decline. The experimental results show that the water adsorption ratio of unidirectional T700/epoxy composite increases with the extending of immersion time, and agrees well with the Fick's law on the whole. There is a significant decline in interlaminate shear properties of unidirectional T700/epoxy composite by almost 10% after immersing for 400 d, and the variation trend of interlaminate shear properties is similar to that of water adsorption ratio. The sensitivity of interlaminate shear properties of unidirectional T700/epoxy composite to seawater is greater than that to distilled water. The cross-sectional microstructure of sample shows that the degradation of the interface between resin and fiber caused by the absorbed seawater is the main reason for the decline in interlaminate shear properties. Therefore, more attention should be paid on the interlaminate shear properties while employing the unidirectional T700/epoxy composite in seawater. 国家"973"计划(2012CB724600)
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