Abstract
The purpose of the work is the use of infrared thermography in examinations and diagnostics of bridges to detect fatigue cracks. The research methods accepted laboratory and natural tests. The configuration of samples (cantilever sheet samples reinforced with stiffeners) and loading conditions corresponded to the actual operating conditions of the bridge beams. As a result of laboratory experiments, the process of metal self-heating around the fatigue crack tips was shown, as well as the general process of temperature change across the entire field of the sample. Also, studies were conducted on the process of self-heating of metal on operated bridge designs with fatigue cracks. The results of laboratory and field studies on welded superstructures are presented, as well as the applied algorithms for the software processing of thermal images are described. Studies have shown the applicability of infrared thermography to identify and assess the degree of development of fatigue cracks in welded superstructures of railway bridges.
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