Fatigue analysis of marine welded joints by means of DIC and IR images during static and fatigue tests

•Full-field techniques were applied for the study of S355 butt welded specimens (DIC and IR Thermography).•The thermographic measurements during static tests can be used to predict the fatigue limit of steel welded joints.•The predicted values are in good agreement with the experimental values of fa...

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Bibliographic Details
Published in:Engineering fracture mechanics 2017-10, Vol.183, p.26-38
Main Authors: Corigliano, P., Epasto, G., Guglielmino, E., Risitano, G.
Format: Article
Language:English
Subjects:
Butt joints
Butt welding
Composite materials
Digital Image Correlation
Digital imaging
Fatigue life
Fatigue limit
Fatigue tests
Infrared imagery
Infrared imaging
Infrared Thermography
Marine structures
Materials fatigue
Static tests
Tensile tests
Thermographic Method
Thermography
Welded joints
Welding
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Summary:•Full-field techniques were applied for the study of S355 butt welded specimens (DIC and IR Thermography).•The thermographic measurements during static tests can be used to predict the fatigue limit of steel welded joints.•The predicted values are in good agreement with the experimental values of fatigue life. The traditional methods of fatigue assessment of metallic and composite materials are extremely time consuming. The thermographic measurements during static tests can be used to predict the fatigue limit. This procedure has been already applied to composite materials. The aim of this study is the application of this procedure for the fatigue assessment of steel welded joints. Static tensile and fatigue tests were carried out on butt welded specimens, made of S355 steel. Two full-field techniques were applied during the tests: digital image correlation and infrared thermography techniques. Fatigue tests at increasing loads were performed by a stepwise succession in order to apply the Thermographic Method. The value of the fatigue limit, obtained by the traditional procedure, was compared with the values predicted by means of the Thermographic Method during stepwise succession fatigue tests and by means of the infrared thermography technique during static tensile tests. The predicted values are in good agreement with the experimental values of fatigue life.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2017.06.012