Integration of imaging and mechanics of FRP/structural materials couples for structural rehabilitation and design

目的：本研究的主要目的是开发新的纤维增强聚合物（FRP）板夹持技术，通过防止结构修复、修复和设计应用中的滑移和脱粘来增强其与结构的整合。**科学方法：将开展一项创新研究计划，包括实验测试、三维（3D）成像和分析建模，以表征FRP材料的夹持和粘合力学。将对FRP与其他常规材料（如混凝土、木材和钢材）接触的界面力学进行综合评价。FRP/结构材料偶对的整体性能将进行实验评估。3D成像技术将用于提供不同加载水平下材料所有内部组件的详细视图。这些细节包括几何信息、表面凹凸不平和碎片堆积。为了评估FRP/结构材料耦合内部的应力分布，3D图像将通过基于图像和“特定样品”的有限元模型的开发集成到力学中。仿真方法将基于图像的几何细节，以考虑通常在传统建模方法中忽略的尺寸和几何形状的变化。摩擦学研究结果将用于夹持系统的开发和优化过程，包括数值和数学建模，以及最优系统的实验评估。同时，还考虑了玻璃钢构件的凹凸不平和制造表面细节。此外，它还包括表面的任何物质，如FRP与混凝土、钢或木材之间的碎片堆积。因此，组件的三维成像有可能提供每个组件的真实几何、拓扑和内部细节，这些细节是构建模型所需的，与在医学领域中使用的方式相同。**新颖性和意义：新型玻璃钢板夹持系统的开发将对扩大玻璃钢材料的结构应用有重大贡献。此外，它将为加强玻璃钢片材与结构的整合铺平道路，因为板与片材之间的几何形状相对相似。此外，3D图像和力学的集成是一种新兴的范例，它有可能为工程材料和系统的性能提供见解。它消除了与加载和/或制造过程引起的几何变化和表面变形相关的不确定性。3D成像数据将用于创建FRP/结构材料界面的3D数值模型。该技术将为研究材料的微观和宏观结构变化（包括疲劳开裂、腐蚀、复合材料的分层和钢筋混凝土的剥离）等更具挑战性的任务铺平道路。所有这些都将大大有助于理解结构材料在不同载荷条件下的力学性能，从而更新混凝土、钢和木结构使用和不使用FRP材料的不同设计标准。此外，新兴的3D成像技术使用详细的计算机断层扫描（CT），除了不同的土木工程应用之外，还具有解决汽车和航空航天工业中遇到的更多机械问题的潜力。

Objectives: The main objective of the proposed research is to develop new gripping techniques for fiber reinforced polymer (FRP) plates to enhance their integration into structures by preventing slippage and debonding for structural repair, rehabilitation and design applications. **Scientific approach: An innovative research program will be conducted that involves experimental testing, three dimensional (3D) imaging, and analytical modeling to characterize gripping and bonding mechanics of FRP materials. A comprehensive evaluation of the interfacial mechanics of the FRP contacting other conventional materials, such as concrete, wood and steel will be investigated. The overall performance of the FRP/structural material couples will be experimentally evaluated. A 3D imaging technique will used to provide detailed views of all internal components of materials at different loading levels. These details include geometrical information, surface asperities, and debris accumulation. In order to evaluate the stress distribution inside the FRP/structural materials couples, the 3D images will be integrated into mechanics through the development of image-based and "sample-specific" finite element models. The simulation methods will be based on the geometrical details of images to account for alteration of the dimensions and geometry that are normally ignored in the conventional modeling methods. The tribological study findings will be used for the development and optimization process of the gripping system which includes numerical and mathematical modeling, in addition to the experimental evaluation of the optimum system. Also, it considers the asperities and manufacturing surface details of the FRP components. Furthermore, it includes any substances on the surface such as the accumulation of debris between FRP and concrete, steel or wood. Therefore, three dimensional imaging of the components has the potential to provide the realistic geometrical, topological, and internal details of each component that are required to build the model in the same way it has been used in the medical field. **Novelty and significance: The development of a new gripping system for FRP plates will have a significant contribution to the expansion of FRP materials structural applications. In addition, it will pave the way for enhancing the integration of FRP sheets into structures due to relative geometrical similarities between the plates and sheets. Furthermore, the integration of 3D images and mechanics is an emerging paradigm that has the potential to provide an insight to the performance of the engineering materials, and systems. It eliminates uncertainties associated with the geometric variations and surface deformation caused by the loading and/or manufacturing processes. The 3D imaging data will be used in creating 3D numerical modeling of the FRP/ structural materials interface. The technique will pave the way for the investigation of more challenging tasks associated with micro and macro structural variations of materials including fatigue cracking, corrosion, delamination of composite materials, and debonding of reinforced concrete. All these will contribute considerably in the understanding of mechanical performance of structural materials under different loading conditions, and consequently updating the different design criteria of concrete, steel, and wood structures with and without FRP materials. Furthermore, emerging 3D imagining technique using detailed computed tomography (CT) has the potential to address more mechanical problems encountered in the auto, and aerospace industries, in addition to different civil engineering applications.