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OALib Journal期刊
ISSN: 2333-9721
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负载PVDF的尼龙无纺布插层的碳纤维/环氧树脂复合材料的结构阻尼性能研究
DOI: 10.11777/j.issn1000-3304.2015.15024, PP. 1060-1069
Keywords: 结构阻尼复合材料,损耗因子,PVDF,尼龙无纺布,离位增韧
Abstract:
以负载定量聚偏二氟乙烯(PVDF)的尼龙无纺布为插层材料,采用共固化工艺制备了碳纤维增强环氧树脂基复合材料,并系统研究了其力学和阻尼性能.测试了复合材料的弯曲强度、弯曲模量、层间剪切强度、Ⅰ型和Ⅱ型断裂韧性等力学性能,并通过动态力学分析仪测试了复合材料的储能模量、损耗模量和损耗因子的温度谱,采用单悬臂梁自由振动实验研究了其阻尼减振性能.与此同时,采用光学显微镜和扫描电镜等分析了复合材料微观结构,进而研究了阻尼机理.结果表明,在复合材料层间插入负载PVDF的尼龙无纺布能在不引起力学性能明显下降的前提下,显著提高复合材料的阻尼性能和断裂韧性.其基本阻尼机理是在共固化过程中热塑性插层材料在复合材料的层间形成了具有较高损耗因子的富树脂区,使损耗因子提高150%,而力学性能基本保持不变.
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