Despite the large number of proposals in the field of fatigue prediction of welded joints, a globally accepted and unified theory, which applies easily to any load condition, does not exist. Real life components, indeed, differ in geometry and/or type of load from the structural design for which they are regarded by Standards, so that a lot of precautionary safety factors are used that lead to an underestimation of the actual fatigue life of joints. Infrared thermography has a great potential in this field, both from structural and thermomechanical points of view. It enables a full field stress analysis with a sufficient spatial resolution so that the complexity of the stress state at the weld toe and its time evolution are taken into account, emphasizing anomalies that may predict structural failure. A new methods for evaluation fatigue limit damage is presented in this paper and in particular interesting results derived from analysis of the evolution of thermoelastic signal phase. Variations in the value of signal phase indicate a not elastic behaviour and plastic dissipation in the material.

Application of thermal methods for characterization of steel welded joints / Galietti, U.; Palumbo, D.. - In: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - ELETTRONICO. - 6:(2010). (Intervento presentato al convegno ICEM14 - 14th International Conference on Experimental Mechanics tenutosi a Poitiers, France nel July 4-9, 2010) [10.1051/epjconf/20100638012].

Application of thermal methods for characterization of steel welded joints

U. Galietti;D. Palumbo
2010-01-01

Abstract

Despite the large number of proposals in the field of fatigue prediction of welded joints, a globally accepted and unified theory, which applies easily to any load condition, does not exist. Real life components, indeed, differ in geometry and/or type of load from the structural design for which they are regarded by Standards, so that a lot of precautionary safety factors are used that lead to an underestimation of the actual fatigue life of joints. Infrared thermography has a great potential in this field, both from structural and thermomechanical points of view. It enables a full field stress analysis with a sufficient spatial resolution so that the complexity of the stress state at the weld toe and its time evolution are taken into account, emphasizing anomalies that may predict structural failure. A new methods for evaluation fatigue limit damage is presented in this paper and in particular interesting results derived from analysis of the evolution of thermoelastic signal phase. Variations in the value of signal phase indicate a not elastic behaviour and plastic dissipation in the material.
2010
ICEM14 - 14th International Conference on Experimental Mechanics
978-2-7598-0565-5
Application of thermal methods for characterization of steel welded joints / Galietti, U.; Palumbo, D.. - In: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - ELETTRONICO. - 6:(2010). (Intervento presentato al convegno ICEM14 - 14th International Conference on Experimental Mechanics tenutosi a Poitiers, France nel July 4-9, 2010) [10.1051/epjconf/20100638012].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/21607
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