Microencapsulated markers for damage detection in adhesive joints
Microencapsulated markers for damage detection in adhesive joints
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用于粘合接头损伤检测的微封装标记
DOI：
10.1080/00218464.2018.1433037
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Kahlmeyer
中科院分区：
文献类型：
--
作者：
Kahlmeyer
胶粘剂的耐久性不仅受粘接工艺质量的影响，而且还受老化过程的影响，在很长一段时间内都会对粘接性能产生负面影响。尤其是建筑行业，与安全相关的接头越来越多地使用粘合剂粘合，这就需要新的质量保证方法。因此，对于裂缝或临界应力的发展，合适的监测技术是必不可少的。本文将提出一种新的透明/不透明胶粘剂在线监测方法。填充了特殊染料的微胶囊被嵌入粘合剂系统中。在胶缝破裂或超过胶缝内的某些应力水平时，胶囊释放其液体芯，导致可检测到的颜色变化，从而实现对粘合的非破坏性状态监测。为了检验这种方法的可行性，通过界面聚合形成了微胶囊。光学或扫描电子显微镜等显微技术可以根据制备过程研究胶囊的形态、形状和尺寸(尺寸和壁厚)。随后，通过热分析(差示扫描量热法和热重分析)研究了该缓释剂的耐久性和释放行为。基于原子力的纳米压痕测量揭示了机械性能的尺寸依赖关系，如硬度和爆破力。最后，通过将制备的胶囊分散在胶粘剂系统中来评估健康监测的原理。除了实验测试之外，还对胶粘剂基质中的裂纹扩展进行了数值模拟，以演示不同尺寸的微胶囊和胶囊壁对断裂行为的影响。这一初步研究证明了该方法的基本可行性，但为了将这一概念应用于工业目的，仍有很大的研究需要。
The durability of adhesive bonds is not only affected by the quality of the bonding procedure but also by aging processes which influence the bond performance negatively on a long time scale. Especially the building industry, where safety related joints are increasingly boned with adhesives, demands new quality assurance methods. Therefore, appropriate monitoring techniques for developing cracks or critical stresses are essential.A new approach for in situ monitoring of transparent/opaque adhesives will be presented in this paper. Microcapsules, filled with special dyes, are embedded into adhesive systems. Upon breakage through cracks or exceedance of certain stress levels within the adhesive seam, the capsules release their liquid cores which leads to a detectable color change and, thus, enables non-destructive condition monitoring of the bond. In order to examine the feasibility of the approach, microcapsules are formed via interfacial polymerization. Microscopy techniques such as optical or scanning electron microscopy allow to study the capsule morphology, shape and dimensions (size and wall thickness) in dependence to the preparation procedure. Thereupon, the durability and release behavior are investigated with thermal analyses (differential scanning calorimetry and thermogravimetric analyses). Atomic force-based nanoindentation measurements give an insight into the size-dependency of mechanical properties like stiffness and burst forces.Finally, the principle of health monitoring is evaluated by dispersing the prepared capsules in the adhesive systems.Apart from the experimental examinations, numerical simulations of the crack propagation within the adhesive matrix are performed to demonstrate the effect of different microcapsule sizes and capsule walls on the fracture behavior.This preliminary study demonstrates the basic feasibility of the approach, but there is still a great need for investigations in order to employ the concept for industrial purposes.
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