Simulation of the mode of failure and application of micro capsules in adhesives for premature damage detection

失效模式模拟及微胶囊在粘合剂中用于过早损伤检测的应用

基本信息

批准号：
284427521
负责人：
Professor Dr.-Ing. Stefan Böhm
金额：
--
依托单位：
Fachgebiet für Trennende und Fügende Fertigungsverfahren
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/284427521?language=en
关键词：
Simulation mode failure application micro

项目摘要

The joining by the application of adhesives has many advantages over other joining techniques. Thereforeadhesive bonding has become a significant part in key industries like automotive engineering and mechanicalengineering. An important issue when dealing with bonded structures is the verification of safety relevantfactors like the strength of the joint and the ageing behavior. This detection is nonetheless strongly limitedsince many test procedures belong to destructive inspection methods, and also non-destructive inspectionswhich are most often conducted during the fabrication process do not deliver any information about the lifeexpectancy of stressed components.The application of adhesives which contain microcapsules filled with dyes as visual markers can readily enablethe detection of deterioration in the adhesive layer: If a crack occurs the micro capsule is also damaged andthe incorporated detectable dye is released. The crack propagation is strongly influenced by theinhomogeneities (micro capsules) in the bond line. Therefore, a main target of this research project is themechanical deterioration simulation of the origin of incipient cracks and the crack propagation in thethree-dimensional network of the adhesive. In addition, the evalution of simulation parameters will be crucial.For the observation of the crack growth systems of transparent substrate materials (e.g. cycloolefine copolymer and polycarbonate) and transparent adhesives polymers like epoxy resins, silicons, acrylates, andpolyurethanes, respectively, will be applied. The required micro capsules are prepared by means of interfacial polymerisation and are characterized in terms of morphology, wall thickness, and particle size distribution. Byvariation of reaction conditions and starting material different capsule parameters can bhe achieved. These capsules will form the basis for the subsequent review of simulation results.

与其他连接技术相比，使用粘合剂进行连接具有许多优点。因此，粘合剂已成为汽车工程和机械工程等关键行业的重要组成部分。处理粘合结构时的一个重要问题是验证安全相关因素，例如接头强度和老化行为。尽管如此，这种检测仍然受到很大的限制，因为许多测试程序属于破坏性检查方法，而且在制造过程中最常进行的非破坏性检查不能提供有关受力部件预期寿命的任何信息。染料作为视觉标记可以很容易地检测粘合剂层的恶化情况：如果发生裂纹，微胶囊也会被损坏，并且所结合的可检测染料被释放。裂纹扩展受到粘合线中不均匀性（微胶囊）的强烈影响。因此，本研究项目的一个主要目标是对胶粘剂的初生裂纹起源和裂纹扩展进行机械劣化模拟。此外，模拟参数的评估也至关重要。为了观察透明基材材料（例如环烯烃共聚物和聚碳酸酯）和透明粘合剂聚合物（例如环氧树脂、硅树脂、丙烯酸酯和聚氨酯）的裂纹扩展系统，将分别应用。所需的微胶囊通过界面聚合制备，并在形态、壁厚和粒径分布方面进行表征。通过改变反应条件和起始材料，可以获得不同的胶囊参数。这些胶囊将构成后续模拟结果审查的基础。