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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636492
• 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：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，通过防止滑脱和剥离来增强其与结构的整合，以用于结构修复、修复和设计应用。科学方法：将开展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，以表征玻璃钢材料的抓取和粘合机理。将对FRP与混凝土、木材和钢等其他常规材料的界面力学进行全面的评估。FRP/结构材料组合的整体性能将通过实验进行评估。3D成像技术将用于提供不同加载水平下材料所有内部成分的详细视图。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的和特定于样品的有限元模型将三维图像整合到力学中。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的改变。摩擦学研究成果将用于抓取系统的开发和优化过程，其中包括数值和数学建模，以及对最佳系统的实验评估。此外，它还考虑了玻璃钢组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，如玻璃钢与混凝土、钢材或木材之间的碎屑堆积。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，这些细节是以其在医学领域中使用的相同方式建立模型所需的。新颖性和意义：新型玻璃钢夹持系统的开发将对扩大玻璃钢材料的结构应用做出重大贡献。此外，由于板和板之间的几何形状相对相似，这将为加强FRP板与结构的集成铺平道路。此外，3D图像和力学的集成是一种新兴的范例，它有可能提供对工程材料和系统的性能的洞察。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数值建模。这项技术将为研究与材料微观和宏观结构变化相关的更具挑战性的任务铺平道路，包括疲劳开裂、腐蚀、复合材料分层和钢筋混凝土脱粘。这将有助于了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，新兴的使用详细计算机断层扫描(CT)的3D成像技术有可能解决汽车、航空航天工业中遇到的更多机械问题，以及不同的土木工程应用。