Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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FATIGUE CRACK GROWTH BEHAVIOR IN 6061-T6 ALUMINUM ALLOY WELDS OBTAINED BY MIEA

R.R. Ambriz  G. Mesmacque  A. Benhamena  A. Ruiz  A. Amrouche  V. H. López   

Anales de la Mecánica de la Fractura, nº 27 . 2010 . Pág. -
Ver (.pdf): 3

Resumen: This work reports the results of the fatigue crack growth on 6061-T6 aluminium alloy welds obtained by modified indirect electric arc (MIEA). Fatigue crack growth behavior in base metal, weld metal and heat affected zone (HAZ) of the welded joint was performed by means of compact-type (CT) specimens. Experimental results indicate that the fatigue crack length depends of the mechanical properties of the material. In this context it has been observed that the HAZ tends to delay the crack growth with respect to base metal and weld metal, this aspect is attributed to the larger plastic zone formed around the crack tip which is promoted by the microstructural transformation from ?’’ to ?’ precipitates. Also, has been found that the crack growth and stress intensity factor (?K) adjust with good confidence according to Paris law, however when ?K reaches a critical value ? 15 MPa m1/2, the fatigue crack growth presents an important change which is related to the microstructural condition of the materials. Finally, the surfaces fractures analysis revealed interesting characteristics in terms of crack propagation.

LocalizaciónPorto

Université Lille Nord de France, F-59000 Lille, France.
Université Lille Nord de France, F-59000 Lille, France.
Université Lille Nord de France, F-59000 Lille, France.
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, A.P. 888, C.P. 58000, Morelia Michoacán, México.
Université Lille Nord de France, F-59000 Lille, France.
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, A.P. 888, C.P. 58000, Morelia Michoacán, México.

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