基于数字体相关方法的胶囊填充型复合材料失效机理研究

聚合物基复合材料以其优异的力学性能在航空航天等高端装备中得到了广泛应用。但在加工和使用过程中，不可避免地会产生微裂纹等损伤，从而导致材料的综合性能下降并产生隐患。在此背景下，微胶囊填充型自修复复合材料应运而生。然而，由于自修复复合材料的微损伤大部分都发生于材料内部，现有的基于表面变形的测试技术难以正确表征其失效机理。本项目采用数字体相关方法研究微胶囊填充型自修复复合材料内部变形演化，揭示其在不同载荷作用下的失效机理，以期发展微胶囊填充型自修复复合材料内部变形测试技术与修复评价方法。研究内容包括：1）微胶囊填充型自修复复合材料内部体像素特征构建方法；2）基于CT的快速三维重构算法及数字体相关方法；3）微胶囊填充型自修复复合材料内部变形规律与损伤修复机理。通过项目研究，提出基于数字体相关方法的微胶囊填充型自修复复合材料内部变形测试方法，揭示微胶囊填充型自修复复合材料修复机理与失效机制。

Polymer-based composite material has been widely applied in aerospace and other high-end equipment due to its excellent mechanical performance. However, in the process of processing and use, it will inevitably produce the damage such as cracks, thus resulting in a decline in the comprehensive performance of the material and produce risk. Under this background, the micro capsule filling self-healing composites arises at the historic moment. However, due to micro damage in the self-healing composites occurs within the material and the existing test technologies, which are based on the surface deformation, are difficult to characterization of its failure mechanism correctly. This project is aim to study the internal deformation evolution of the micro capsule filling self-healing composites using digital volume correlation method, reveal its failure mechanism in different loading, and develop internal deformation testing technology and repair evaluation method for the micro capsule filling self-healing composites. The research content includes: 1) the construction method of internal volume characteristics of pixels for microcapsule filled self-healing composites; 2) rapid 3D reconstruction algorithm based on computed tomography (CT) and digital volume correlation method; 3) the internal deformation law and damage mechanism of microcapsule filled self-healing composites. The internal deformation test method based on digital volume correlation for microcapsule filled self-healing composites is proposed, and the self-healing and failure mechanism of microcapsule self-healing composite is revealed. Project research not only enriches the internal deformation measurement technology, but also provides effective technical means for self-healing mechanism revealing of microcapsule self-healing composites.