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Indexed by:期刊论文

Date of Publication:2012-11-25

Journal:STRUCTURAL ENGINEERING AND MECHANICS

Included Journals:SCIE、EI、Scopus

Volume:44

Issue:4

Page Number:417-429

ISSN No.:1225-4568

Key Words:fatigue performance; welded joint; infrared thermography; energetic damage model; residual fatigue life

Abstract:Taking the superficial temperature increment as the major fatigue damage indicator, the infrared thermography was used to predict fatigue parameters (fatigue strength and S-N curve) of welded joints subjected to fatigue loading with a high mean stress, showing good predictions. The fatigue damage status, related to safety evaluation, was tightly correlated with the temperature field evolution of the hot-spot zone on the specimen surface. An energetic damage model, based on the energy accumulation, was developed to evaluate the residual fatigue life of the welded specimens undergoing cyclic loading, and a good agreement was presented. It is concluded that the infrared thermography can not only well predict the fatigue behavior of welded joints, but also can play an important role in health detection of structures subjected to mechanical loading.