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在自然环境中使用的复合材料受环境因素影响,性能会出现不同程度的下降,本文利用"时温等效"原理,加速复合材料老化进程,对T800碳纤维/环氧树脂基复合材料及其内部缺陷在湿热老化条件下的性能影响进行研究,分析了复合材料及其内部分层缺陷在湿热老化条件下的微观形貌变化及对力学性能的影响。结果表明:T800碳纤维/环氧树脂内部无分层缺陷的复合材料在90℃和30%RH湿热老化条件下弯曲强度出现先升后降;存在内部分层缺陷的复合材料在同等老化条件下,缺陷处加速了水分子的侵蚀作用,弯曲强度降低了12%,降幅明显高于无缺陷复合材料。 相似文献
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碳纤维复合材料湿热性能研究进展 总被引:9,自引:4,他引:9
对于碳纤维增强树脂基复合材料,湿热环境条件对其力学性能的影响非常明显,可导致其强度和刚度下降.在研究了国内外关于碳纤维增强树脂基复合材料湿热老化性能的基础上,从理论模型和试验方法两方面分析了复合材料吸湿模型和扩散机理,结合实际需求对国内外关于碳纤维复合材料湿热性能的试验方法和测试手段进行了评价,认为目前湿热加速老化性能的研究具有一定的局限性,并提出了研究思路. 相似文献
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通过人工加速老化试验,研究了聚甲基丙烯酸甲酯(PMMA)在不同紫外辐照条件下的性能变化规律。利用力学试验、凝胶渗透色谱(GPC)、傅里叶红外光谱(FTIR)等表征技术,分析了紫外老化对PMMA力学性能、分子结构、分子量及分子量分布的影响。结果表明,随着紫外老化的环境温度提高、老化时间延长,样品的拉伸强度、冲击强度均呈现下降趋势。样品在环境温度100℃条件下,老化280 min后,冲击强度下降最明显。老化后,红外光谱的羰基吸收带加宽,并且在1615 cm^-1处和1640 cm^-1处出现了包含不饱和键和羰基生色团的新吸收峰,样品的分子量微分分布宽度变宽,分子量移向低分子端的趋势明显,分子量多分散性增加。 相似文献
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本文讨论了温度,降水量和相对湿度三种气候因素对T300/4211单向碳纤维复合材料层间剪切强度和弯曲性能保持率的影响,指出相对湿度对T300/4211碳纤维复合材料层间剪切强度有影响,温度和降水量则对复合材料层间剪切强度和弯曲性能保持率的影响不明显。 相似文献
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碳复合材料壳体老化性能 总被引:3,自引:0,他引:3
本文叙述了碳复合材料壳体放置15年后进行的结构试验,并对其各项性能进行对比和分析,从而得出壳体的老化性能,本研究将对今后碳复合材料产品的研制,生产和用具有较重要的参考价值。 相似文献
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碳纤维增强复合材料性能影响因素的探讨 总被引:6,自引:0,他引:6
刘越 《高科技纤维与应用》2003,28(2):29-33
碳纤维复合材料以其优异的性能,在社会各领域都得到了广泛的应用.复合材料整体性能的优劣不仅取决于各组成部分本身的性能,同时也与各组分间的配比,加工条件及由此所形成的纤维与基体间界面性能等有密切的关系.本文对影响碳纤维复合材料性能的有关因素作了探讨. 相似文献
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以高密度聚乙烯(HDPE)为主要研究对象,在其中添加一定量的纳米ZnO制成复合材料,并用傅里叶红外变换仪和熔融指数仪,分析其在人工加速真空老化、湿热老化、紫外老化条件下的宏观性能变化和微观结构变化.实验结果表明,纳米ZnO的加入能抑制HDPE的老化,添加量为1.5%(质量分数)时效果最佳;各种老化条件中,紫外老化对材料性能影响最大. 相似文献
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大丝束碳纤维复合材料力学性能研究 总被引:3,自引:1,他引:2
本文研究了大丝束碳纤维(48K)复合材料的常规力学性能及耐湿热性能,并与小丝束碳纤维(T300.3K)复合材料进行了对比,研究结果可为大丝束复合材料在航空器的次承力件或非承力件的应用提供技术基础。 相似文献
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传统工艺碳纤维增加PA66复合材料批次间有差异、产品理化性能不稳定、工艺能耗高,而本生产工艺工序简洁,能耗少,成本低,生产效率高。 相似文献
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热处理对PET/PTT复合纤维力学性能的影响 总被引:1,自引:0,他引:1
对不同线密度的聚对苯二甲酸乙二醇酯/聚对苯二甲酸丙二醇酯(PET/PTT)复合纤维分别进行干热处理,常压沸水处理,120℃及0.2MPa的高压沸水处理,研究了其热处理前后的力学性能。结果表明:PET/PTT复合纤维经常压沸水处理后,初始模量下降,断裂伸长率及断裂功增大,断裂强度略有减小;复合纤维经高压沸水处理后,其力学性能明显提高,常压沸水处理其次,干热处理则变化不大;复合纤维经干热处理后,其初始模量、断裂强度、断裂伸长率及断裂功随温度的升高均先升高后降低,150℃时达到最大。 相似文献
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环氧/碳纤维复合材料性能研究 总被引:2,自引:0,他引:2
乌云其其格 《高科技纤维与应用》2004,29(1):24-26
本文主要分析了碳纤维帘子布复合材料的性能,并与T300单向碳纤维复合材料性能进行对比。结果表明,碳纤维帘子布复合材料性能低于T300单向碳纤维复合材料性能。 相似文献
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短碳纤维增强碳化硅基复合材料的制备 总被引:5,自引:0,他引:5
短纤维的分散均匀性一直是短纤维复合材料应用受限的主要原因.采用固相球磨分散和熔融渗硅工艺,可得到均匀分散的短碳纤维增强碳化硅基复合材料.并利用金相显微镜见察复合材料微观形貌,测试复合材料的抗弯强度和断后韧性. 相似文献
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Bruno Ribeiro Jefersson A. R. Corredor Laura Ardila Luis F. P. Santos Michelle L. Costa Mirabel C. Rezende Edson C. Botelho 《应用聚合物科学杂志》2020,137(5):48330
Vacuum filtration technique was employed in order to prepare multiwalled carbon nanotube buckypapers (MWCNT-BP) through a well-dispersed suspension of MWCNT/H2O with the aid of Triton X-100 surfactant. The obtained BP (buckypaper) was then infiltrated with a solution of poly (ether-imide) (PEI) under vacuum conditions. The visual inspection demonstrated the importance of the centrifugation procedure before the vacuum filtration of the suspension, revealing a smooth surface of the as-prepared buckypaper. Thermogravimetric experiments (TGA) and scanning electron microscopy analyses have demonstrated the role of isopropyl alcohol in the removal of Triton X-100 from the nanotube network. SEM observations of the cross-section view of the samples revealed a porous network of the fabricated BP, and an impregnated structure of the PEI/BP composite, suggesting a good interfacial bonding between MWCNT and PEI. Moreover, significant improvements were achieved in mechanical and thermal properties of PEI matrix by the incorporation of BP, as the increase of both the storage modulus (42%) and the T g (11 °C) for the PEI/BP composite. TGA have shown a significant increase in the onset decomposition temperature of the polymer by the incorporation of the BP. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48330. 相似文献
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In this article, T800 carbon fiber/epoxy resin composite was subjected to hygrothermal aging. By analyzing the mass change, surface morphology before and after aging, infrared spectra, and dynamic mechanical properties, the effect of hygrothermal aging on the composite properties was studied. The hygrothermal aging of the composite after low-velocity impact, the effects of environmental factors on the damaged area, and the post-impact compression properties of composites were studied. The results showed that the saturation moisture absorption rate of the composite after aging (71°C constant temperature) was 0.88%. Upon increasing the impact energy, an indentation appeared before the inflection point at 35 J. When the impact energy was less than 15 J, aging did not affect invisible damage. Above this, the damaged area and number of internal cracks and defects in the composite were increased. After aging, the compressive strength of composite laminates with impact damage decreased obviously. During the aging stage, the residual compressive strength of the sample was the lowest in the moisture saturated state, and hygrothermal aging had little effect on the compression failure mode after impact. 相似文献
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Rie Nobe Jianhui Qiu Makoto Kudo Guohong Zhang 《Polymer Engineering and Science》2020,60(7):1507-1519
Employing microcellular injection molding technology, carbon fiber (CF)/polypropylene (PP) composite foams have been prepared. The influences of injection molding conditions and CF amounts relating to the flexural and impact performances have also been studied. X-ray computed tomography scanning has been used for morphological observation. For the flexural specimens, although the solid skin and foamed core layers can be confirmed significantly, the intermediate layer is indistinct. Moreover, the stretched cells can be confirmed dramatically for the Charpy impact specimens. The cell density increases to 12.0 × 103 cell/cm2 when the nitrogen content is 1%. By contrast, the cell densities decrease with the injection speed and CF content increasing accordingly. Further, the maximum specific flexural modulus and Charpy impact strength of the foams can achieve 14 GPa/(g/cm3) and 6.2 kJ/m2, respectively, at the CF content of 30 wt%. Finally, the microcellular structure with the highest cell density can be confirmed with the nitrogen content of 1 wt%, the injection speed of 50 mm/s and the CF content of 10 wt%. Obviously, the CF contents have shown strong influences on the mechanical behaviors of the CF/PP composite foams compared with nitrogen contents or injection speeds. 相似文献