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

集成 FRP/结构材料对的成像和力学，用于结构修复和设计

• 批准号: 418687-2013
• 负责人: AlMayah, Adil
• 金额: $ 1.6万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=643809
• 关键词: Integration; imaging; mechanics; FRP; structural

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.

目的：拟议的研究的主要目标是开发新的夹持技术的纤维增强聚合物（FRP）板，以提高其整合到结构中，防止滑移和剥离的结构维修，康复和设计应用。** 科学方法：将进行一项创新的研究计划，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。将研究FRP与其他常规材料（如混凝土、木材和钢）接触的界面力学的综合评价。将对FRP/结构材料组合的整体性能进行实验评估。3D成像技术将用于提供不同负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、表面粗糙度和碎片堆积。为了评估FRP/结构材料耦合内部的应力分布，将通过开发基于图像和“样本特定”的有限元模型将3D图像集成到力学中。模拟方法将基于图像的几何细节，以考虑在传统建模方法中通常被忽略的尺寸和几何形状的改变。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，以及对最佳系统的实验评估。 此外，还考虑了FRP部件的粗糙度和制造表面细节。此外，它还包括表面上的任何物质，例如FRP与混凝土、钢或木材之间的碎片堆积。因此，组件的三维成像具有提供每个组件的真实几何、拓扑和内部细节的潜力，这些细节是以与在医学领域中使用的相同方式构建模型所需的。 ** 新奇和重要性：开发一种新的FRP板夹持系统将对扩大FRP材料结构应用做出重大贡献。此外，它将铺平道路，以提高玻璃钢片材集成到结构，由于板和片材之间的相对几何相似性。此外，3D图像和力学的集成是一种新兴的范例，有可能为工程材料和系统的性能提供洞察力。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。该技术将铺平道路，与材料的微观和宏观结构的变化，包括疲劳开裂，腐蚀，复合材料的分层，剥离钢筋混凝土的更具挑战性的任务的调查。所有这些将有助于理解结构材料在不同荷载条件下的力学性能，从而更新混凝土、钢和木结构的不同设计标准。此外，新兴的3D成像技术，使用详细的计算机断层扫描（CT）有可能解决更多的机械问题，在汽车，航空航天工业，除了不同的土木工程应用。