Development of a structural integrity evaluation system based on remote visual and infrared stress/strain measurement.

基于自参考锁相红外热成像和数字图像相关技术的远程定量无损裂纹评估技术，以及基于现场热弹应力测量的断裂力学分析，构建了一种新的含疲劳裂纹钢结构的结构完整性评估方法。从实验室样品和实际钢桥的实验研究中发现，所提出的方法使我们能够进行完全远程，非接触和无损检测的疲劳裂纹和疲劳裂纹周围的应力分布评估。

A new structural integrity evaluation method for steel structures with fatigue cracks was constructed based on remote quantitative nondestructive crack evaluation technique utilizing self-reference lock-in infrared thermography and digital image correlation, as well as fracture mechanics analysis based on on-site thermoelastic stress measurement. It was found from experimental studies for laboratory samples and actual steel bridges that proposed method enabled us to conduct completely remote, noncontact and nondestructive detection of fatigue cracks and to evaluate stress distribution around fatigue cracks.