Developing of a repair method for carbon fibre reinforced plastics by using thermally activated oxide semiconductors

基于碳纤维增强材料的纤维塑料（FRP）在高科技应用中的使用正在稳步增长，因此对CFRP构件的适当修复概念的研究需求和需求不断增加。本项目的主要目标是为开发基于热固性材料的CFRP结构构件在高科技应用中的新修复方法奠定科学基础。建议从受损区域完全移除现有基体，插入符合负载的更新纺织增强层，然后最终用合适的基体加固和加固增强物。 因此，初始承载能力的目的是要实现没有任何额外的增厚的原始结构。研究的目的是研究不同的无机氧化物的热固性基体系统的基础上，主要使用的环氧树脂的局部降解的效率。选择标准是氧化物半导体的带隙，因为它显著影响激活能和相关的操作温度。在连接所需的活化能的催化剂和其注入到局部去除的热固性基质中的修复区域，具体的控制矩阵退化进行检查。此外，金属氧化物对碳纤维的机械性能（纤维降解，弹性模量，拉伸强度，表面能）和完整和降解基质之间的过渡区的影响进行了分析。后者对于新基质材料的粘附特别重要。为了重建复合材料的承载能力，对原结构损伤后新的纺织增强层进行了模拟辅助分析。最后，修复的CFRP结构的初始承载能力通过在更新的已建立的增强区域中的复合材料形成来恢复，所述复合材料形成通过浸渍、用相同的真空注入的热固性基质材料固结以及随后的硬化。这些研究最初是在矩形和圆形损伤样品上进行的。

The use of fibre plastic (FRP) based on carbon fibre reinforcements in high-tech applications is steadily growing, resulting in the demand and the increasing need for research on appropriate repair concepts for CFRP components.The main objective of this project is to create a scientific basis for the development of a new repair method for CFRP structural components based on thermosets in high-tech applications. It is proposed to completely remove the existing matrix from the damaged region, insert load conforming renewed textile reinforcement layers and then finally to impregnate and consolidate the reinforcements with a suitable matrix. Thereby, the initial load bearing capacity is intended to be achieved without any additional thickening of the original structure.The research objective is to study the efficiency of different inorganic oxides for the local degradation of thermosetting matrix systems based on the predominantly used epoxy resins. A selection criterion is the band gap of the oxide semiconductor, because it significantly affects the activation energy and the associated operating temperature. In connection with the required activation energy of the catalyst and its injection into the local removal of the thermosetting matrix in the repair area, the specific control of matrix degradation is examined. Furthermore, the influence of the metallic oxides on the mechanical properties of carbon fibres (fibre degradation, modulus of elasticity, tensile strength, surfaces energy) and the transition zone between the intact and degraded matrix has to be analyzed. The latter is particularly important for the adhesion of the new matrix material. The possible role of the remaining catalyst materials in reestablished composite and their mechanical properties have also to be explored.For the reestablishment of the load bearing capacity of the composite, a simulation aided analysis is intended for the reconstruction of the new overlapping textile reinforcement layers in the damage of the original structure. Finally, the initial loading bearing capacity of the repaired CFRP structure is restored by the composite formation in the renewed established reinforcing area through impregnation, consolidation with the same vacuum infused thermoset matrix material and subsequent hardening. These studies are initially carried out on rectangular and circular damaged samples.