Non-Destructive Evaluation of Structures Retrofitted with Fiber Composites

纤维复合材料改造结构的无损评估

• 批准号: 9622403
• 负责人: Mo Ehsani
• 金额: $ 9万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9622403&HistoricalAwards=false
• 关键词: Non; Destructive; Evaluation; Structures; Retrofitted

*** 9622403 Ehsani Fiber Reinforced Composites, FRP, are fast becoming a viable new construction material. Perhaps the most suitable area of application for these materials is in the field of strengthening, repair and rehabilitation of existing civil structures. A major concern, however, is the quality control at the time of construction and the long-term behavior of these materials. The primary focus of this study is to develop a Non- Destructive Evaluation system for determining the characteristics of composites used in the construction industry. The equipment can be utilized after the completion of the construction to monitor any deterioration or delamination of the FRP which could result from environmental effects such as ultraviolet rays, moisture penetration, etc. The quality of rehabilitation will be monitored nondestructively by ultrasonic inspection of internal defects, voids and delaminations. In this research "kissing" and "slip" bonded interfaces, often dangerous for the integrity of material systems, will be investigated by exciting strong interface waves. It is expected that one will be able to successfully detect these defects by generating interface waves at the imperfect bond interfaces using an ultrasonic scanner. ***

*** 9622403 Ehsani 纤维增强复合材料（FRP）正在迅速成为一种可行的新型建筑材料。 也许这些材料最合适的应用领域是现有土木结构的加固、修复和修复领域。 然而，一个主要问题是施工时的质量控制以及这些材料的长期性能。 本研究的主要重点是开发无损评估系统，以确定建筑行业使用的复合材料的特性。 该设备可在施工完成后用于监测玻璃钢因紫外线、湿气渗透等环境影响而可能导致的劣化或分层。通过对内部缺陷、空隙和分层进行超声波检查，对修复质量进行非破坏性监测。 在这项研究中，“接吻”和“滑移”粘合界面通常对材料系统的完整性造成危险，将通过激发强界面波进行研究。 预计人们将能够通过使用超声波扫描仪在不完美的键合界面处产生界面波来成功地检测这些缺陷。 ***