INVESTIGADORES
CHAPETTI mirco Daniel
artículos
Título:
Fatigue behavior prediction of welded joints by using an integrated fracture
Autor/es:
M.D. CHAPETTI; L.F. JAUREGUIZAHAR
Revista:
INTERNATIONAL JOURNAL OF FATIGUE
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 43 p. 43 - 53
ISSN:
0142-1123
Resumen:
Current fracture mechanics methods for fatigue assessment of welded joints are based on long crack
behavior. The present work introduces a method to predict the fatigue strength of welded joints by
means of an integrated fracture mechanics approach (IFMA) that takes into account the fatigue behavior
of short cracks. This methodology estimates the fatigue crack propagation rate as a function of the difference
between the applied driving force and the material threshold for crack propagation, function of
crack length. Firstly, the proposed fracture mechanic method is introduced and compared with the traditional
fracture mechanic approach, used mainly for fitness for purpose assessment of welded joints
with cracks or other crack-like defects. Then, the method is used for several theoretical and parametric
applications to show its ability to predict the influence of different mechanical, geometrical and microstructural
parameters in the definition of the fatigue resistance of welded joints. The influence of plate
thickness, initial crack length and reinforcement angle on fatigue strength of butt-welded joints has been
analysed and results show good agreement with experimental trends. Finally, the method is applied to
predict and analyze the fatigue behavior of butt welded and non-load-carrying transverse fillet welded
joints, and estimated and experimental results are analysed and compared.