共查询到17条相似文献,搜索用时 171 毫秒
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损伤监测与断裂修复是复合材料研究的难题之一。利用空心光纤注胶来实现复合材料的自诊断、自修复是一种行之有效的方法。由此对空心光纤的传光机理做了详细的研究和分析,并介绍了利用空心光纤对复合材料断裂位置进行测量的原理、方法及实验研究。首先给出了空心光纤的性能,其次介绍了利用测量光纤衰减特性的剪断方法来进行复合材料断裂位置的研究,最后介绍了Y型耦合器在断裂位置研究中的实用性,并以一个系统的实验原理图作为整个研究的小结。 相似文献
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光纤智能混凝土结构自修复的研究 总被引:9,自引:0,他引:9
研究了空心光纤的传输特性与匹配特性、混凝土结构损伤、裂缝的自诊断检测以及利用注入粘度小的缩聚高分子溶液粘结修补剂来实现混凝土的自修复。论述了空光纤与混凝土结构强度的匹配,为空心光纤用于混凝土结构损伤的自诊断与自修复提供了研究依据。对自诊断、自修复系统的总体方案进行了研究和分析,实验结果验证了该方案的可行性。 相似文献
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自修复复合材料研究进展 总被引:14,自引:0,他引:14
具有自诊断、自修复功能的智能复合材料已成为新材料领域研究的重点之一.本文从陶瓷混凝土基复合材料、聚合物基复合材料和金属基复合材料三方面简要介绍了具有自修复能力的智能材料的概念、制备原理和模型.对近年来该领域的最新研究进展进行了评述,并总结了具有机敏性自愈合能力的材料的组成要素. 相似文献
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微脉管型自修复复合材料研究进展 总被引:1,自引:0,他引:1
自修复复合材料作为一种智能材料,可以自主修复材料中出现的损伤,保持结构完整性,与传统复合材料相比具有明显的优势。微脉管型自修复复合材料因其可进行多种控制,实现多次可重复的高效率修复,有望成为最重要的自修复复合材料之一。文中综述了近年来微脉管型自修复复合材料的研究分支和进展,总结了相关研究方法和研究成果。最后指出了现有研究存在的不足,并提出了未来的研究方向。 相似文献
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自修复复合材料作为一种智能材料,可以自主修复材料中出现的损伤,保持结构完整性,与传统复合材料相比具有明显的优势。微脉管型自修复复合材料因其可进行多种控制,实现多次可重复的高效率修复,有望成为最重要的自修复复合材料之一。文中综述了近年来微脉管型自修复复合材料的研究分支和进展,总结了相关研究方法和研究成果。最后指出了现有研究存在的不足,并提出了未来的研究方向。 相似文献
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提出并设计了一种基于Advanced RISC Machines(ARM)和General Packet Radio Service(GPRS)的远程数据传输系统,该系统用于光纤智能结构的健康监控。系统包括光源、光纤智能结构、光电检测电路、远程终端单元(RTU)、GPRS网络、Internet和监控中心服务器,其中终端单元由ARM微控制器和GPRS无线通信模块组成。RTU与监控中心之间是通过GPRS网络和Internet来进行数据交换的,在监控中心收到的数据中包含了复合材料智能结构的健康状态信息,通过对数据的处理就能判断材料结构的健康状态,从而达到对智能材料结构的健康状态进行远程监控的目的,同时还进行了相应的承载试验以及损伤定位研究。试验结果表明:该监控系统实现了对光纤智能结构的无线远程监控和损伤定位,且性能稳定可靠,为复合材料结构的健康状态监控提供了一种新方法。 相似文献
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J. PEÑA‐MACIAS M. C. PÉREZ R. MARTÍNEZ‐OÑA Y. GÓMEZ‐ULLATE F. MONTERO DE ESPINOSA G. KAWIECKI 《Fatigue & Fracture of Engineering Materials & Structures》2008,31(12):1019-1030
The work outlined in this paper is a part of a wider effort aimed at the development of a built‐in system for real‐time damage detection in aircraft structures. The objective of this study was to show the feasibility of applying low‐frequency phased‐array transducers for damage detection in metallic structures with bonded repairs and, also, in structures made of composite materials. This paper is divided into two main portions: a component dedicated to the monitoring of crack growth under a simulated composite repair and a part describing an introductory study done for composite panels monitoring. The data acquisition system is also described. The results of the study described in this paper indicate that a low‐frequency, built‐in phased‐array system can successfully estimate the length of a crack growing under a bonded repair. Satisfactory results of monitoring simulated defects in composite structures are presented, as well. 相似文献
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Hanne M. van der Kooij Arijana Susa Santiago J. García Sybrand van der Zwaag Joris Sprakel 《Advanced materials (Deerfield Beach, Fla.)》2017,29(26)
Self‐healing polymers can significantly extend the service life of materials and structures by autonomously repairing damage. Intrinsic healing holds great promise as a design strategy to mitigate the risks of damage by delaying or preventing catastrophic failure. However, experimentally resolving the microscopic mechanisms of intrinsic repair has proven highly challenging. This work demonstrates how optical micromechanical mapping enables the quantitative imaging of these molecular‐scale dynamics with high spatiotemporal resolution. This approach allows disentangling delocalized viscoplastic relaxation and localized cohesion‐restoring rebonding processes that occur simultaneously upon damage to a self‐healing polymer. Moreover, frequency‐ and temperature‐dependent imaging provides a way to pinpoint the repair modes in the relaxation spectrum of the quiescent material. These results give rise to a complete picture of autonomous repair that will guide the rational design of improved self‐healing materials. 相似文献
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Na Li Pingping Wei Linan Yu Junyi Ji Jiupeng Zhao Chuanbo Gao Yao Li Yadong Yin 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(7)
The dynamic optical switch of plasmonic nanostructures is highly desirable due to its promising applications in many smart optical devices. To address the challenges in the reversibility and transmittance contrast of the plasmonic electrochromic devices, here, a strategy is reported to fabricate color switchable electrochromic films through electro‐responsive dissolution and deposition of Ag on predefined hollow shells of Au/Ag alloy. Using the hollow Au/Ag alloy nanostructures as stable seeds for site‐specific deposition of Ag, elimination of the random self‐nucleation events is enabled and optimal reversibility in color switching is allowed. The hollow structure further enables excellent transmittance contrast between the bleached and colored states. With its additional advantages such as the convenience for preparation, high sensitivity, and field‐tunable optical property, it is believed that this new electrochromic film represents a unique platform for designing novel smart optical devices. 相似文献
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将结构型钢纤维及纳米炭黑作为导电材料加入混凝土形成智能混凝土,并将智能混凝土和素混凝土一起浇筑形成双层混凝土梁。在四点弯曲加载下,采用四电极法对混凝土试件的电阻进行测量,对比研究了复掺钢纤维-纳米炭黑/混凝土层中钢纤维掺量及智能层厚度对混凝土梁的弯曲性能及裂缝自监测性能的影响。结果表明:混凝土智能层内结构型钢纤维的掺量和智能层厚度的增加能够显著提高混凝土梁的弯曲性能;依据电阻变化率-时间(ρFCR-t)曲线的变化特征可对混凝土的裂缝出现时刻进行监测,裂缝出现前,ρFCR-t曲线基本维持在零点附近,智能混凝土梁出现裂缝时,ρFCR-t曲线开始急剧上升,出现新裂缝后,ρFCR-t曲线出现新的转折点,斜率发生明显变化;裂缝出现时,试件的ρFCR增长较迅速,后期ρFCR增长变缓,ρFCR-裂缝扩展宽度(ωCOD)曲线呈负衰减函数特征;对于双层混凝土梁,增加混凝土智能层钢纤维掺量和智能层厚度,减小了相同裂缝宽度下裂缝自监测信号ρFCR的数值;本文提出的一阶指数衰减函数模型拟合ρFCR-ωCOD曲线效果较好。 相似文献
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Oya Ilke Sentürk Elizaveta Chervyachkova Yuhao Ji Seraphine V. Wegner 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(25)
The ability of living systems to self‐sort different cells into separate assemblies and the ability to independently regulate different structures are one ingredient that gives rise to their spatiotemporal complexity. Here, this self‐sorting behavior is replicated in a synthetic system with two types of colloidal particles; where each particle type independently self‐assembles either under blue or red light into distinct clusters, known as narcissistic self‐sorting. For this purpose, each particle type is functionalized either with the light‐switchable protein VVDHigh or Cph1, which homodimerize under blue and red light, respectively. The response to different wavelengths of light and the high specificity of the protein interactions allows for the independent self‐assembly of each particle type with blue or red light and narcissistic self‐sorting. Moreover, as both of the photoswitchable protein interactions are reversible in the dark; also, the self‐sorting is reversible and dynamic. Overall, the independent blue and red light controlled self‐sorting in a synthetic system opens new possibilities to assemble adaptable, smart, and advanced materials similar to the complexity observed in tissues. 相似文献
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光纤缠绕式应变传感器 总被引:2,自引:0,他引:2
研究了一种可用于机敏复合材料与结构状态监测的本征型强度调制光纤应变传感器,它由两根以上多模光纤相互缠绕绞合形成。分析了该传感器的应变传感原理,得到其既能测量拉应变、又能测量压应变的结论。传感器对应变的响应具有良好的线性和重复性,灵敏度高,无迟滞现象。对植入碳纤维/环氧复合材料内的光纤缠绕型应变传感器的实验结果与理论分析一致,表明该传感器是适合于机敏复合材料与结构状态监测的较为理想的光纤传感器。 相似文献