论文部分内容阅读
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400d)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400d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 affecting the interlaminar shear properties of unidirectional T700 / epoxy composites under seawater environment were studied. The effects of seawater and distilled water on the shear properties of unidirectional T700 / epoxy composites after five immersion cycles (15, 40, 70, 165 and 400 days) Epoxy composite material between the shear properties and water absorption rate change, and SEM observation of the uni-directional T700 / epoxy composite shear fracture micro-morphology revealed its performance degradation mechanism. The results show that the water absorption of unidirectional T700 / epoxy composites increases with the immersion time, which accords with the change law of Fick water absorption. The interlaminar shear properties of unidirectional T700 / epoxy composites decrease obviously, After 400 days, the interlaminar shear property loss is nearly 10%, and the change rule of interlaminar shear property is similar to that of water absorption. The interlaminar shear property of unidirectional T700 / epoxy composites is more sensitive to seawater than to distilled water Of the sensitivity of the specimen microstructure from the microstructure can be seen that the infiltration of seawater damage to the resin and the fiber interface, which is the main reason for the significant decline in interlaminar shear properties, so the one-way T700 / epoxy composite The use of materials in seawater requires more attention to their interlaminar shear properties.