共查询到12条相似文献,搜索用时 62 毫秒
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介绍了碳纤维布(CFRP)加固混凝土梁构件的正截面受弯破坏模式,提出了计算方法。 相似文献
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外贴啁啾光栅监测带双缺口复合材料静态拉伸损伤 总被引:1,自引:1,他引:0
啁啾光栅对沿其纵向的非均匀应变分布十分敏感,这种特性会反映在啁啾光栅的反射光谱图中。提出了一种利用外贴啁啾光栅监测带双缺口碳纤维复合材料损伤的新技术。实验结果表明,复合材料结构静态拉伸应变为4500 με与8500 με时,啁啾光栅反射光谱变化明显,这与复合材料应力应变关系曲线在应变8000 με时产生突变完全吻合,同时光栅反射光谱光强突变点位置与光栅几何位置完全一致,可实现对复合材料缺口位置损伤的定位及扩展监测。 相似文献
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本文研究了密封光纤碳涂层电阻特性与光纤可靠性之间的关系后,得出:最佳的碳涂层电阻能提高光纤抗疲劳性能,并为研制长长度、高强度和高可靠性涂层密封光纤提供了实验依据。 相似文献
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Kai Yu Qian Shi Martin L. Dunn Tiejun Wang H. Jerry Qi 《Advanced functional materials》2016,26(33):6098-6106
Both environmental and economic factors have driven the development of recycling routes for the increasing amount of composite waste generated. This paper presents a new paradigm to fully recycle epoxy‐based carbon fiber reinforced polymer (CFRP) composites. After immersing the composite in ethylene glycol (EG) and increasing the temperature, the epoxy matrix can be dissolved as the EG molecules participate in bond exchange reactions (BERs) within the covalent adaptable network (CAN), effectively breaking the long polymer chains into small segments. The clean carbon fibers can be then reclaimed with the same dimensions and mechanical properties as those of fresh ones. Both the dissolution rate and the minimum amount of EG required to fully dissolve the CAN are experimentally determined. Further heating the dissolved solution leads to repolymerization of the epoxy matrix, so a new generation of composite can be fabricated by using the recycled fiber and epoxy; in this way a closed‐loop near 100% recycling paradigm is realized. In addition, epoxy composites with surface damage are shown to be fully repaired. Both the recycled and the repaired composites exhibit the same level of mechanical properties as fresh materials. 相似文献
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微结构聚合物光纤化学修饰的pH值传感探头 总被引:1,自引:0,他引:1
为了拓展微结构聚合物光纤(MPOF)在化学传感领域内的应用研究以及对MPOF孔道内壁功能化修饰技术的深入研究, 首先对36孔的MPOF孔道内壁进行酸催化水解处理, 随后采用化学键合的方式将荧光探针曙红通过偶联剂负载于MPOF孔道内壁, 从而制成用于pH值测定的传感探头。该传感探头被修饰后的多个孔道可以容纳微量的待测溶液, 待测物与孔道内壁的荧光探针作用后, 光信号将可以沿光纤传输, 并被检测。整个化学反应的传感过程是在孔道内进行的, 传导的光束能够和敏感材料相重叠, 利于微量分析同时避免了对敏感膜的损坏。实验结果显示pH值在2.0~4.4范围内与荧光强度呈线性关系, 该传感探头的重现性良好, 并且采用此修饰方法制备的MPOF传感探头对于荧光探针的固定性比较好, 无明显泄漏。 相似文献