Short crack initiation and growth kinetics analysis in a microalloyed steel plate using rotating bending fatigue modified notched specimens
Por:
Mayén J., Serna S.A., Campillo B., Flores O.
Publicada:
10 oct 2013
Resumen:
Experimental microalloyed steel was tested employing samples with a
suitable geometry for crack initiation and kinetics of short crack
propagation monitoring through rotating bending fatigue constant loads.
Trough the Finite Element Method (FEM) stress distribution was evaluated
in pre-selected zones to establish the critical points for visual
examination of the initiation cracks by optical microscopy. The
experimental test loads were established between the fatigue and elastic
limits. The short crack evolution was studied by means of the
exponential crack growth law. It was shown that the initiation process
of fatigue cracks is intensified gradually by the fatigue damage,
featuring by the appearance of persistent slip bands, and the growth of
short cracks mechanism is related to the coalescence of micro-cavities.
Features of interaction between the surface cracks and steel
microstructure are reported. The smoothing splines method was employ to
analyze the kinetic crack growth data to establish a correlation between
the crack length and crack growth rate. For the first time in this kind
of steels, a relevant result is reported, the crack growth coefficient,
Kg, that characterize their fatigue short crack growth under the
influence of different constant loads. (C) 2013 Elsevier B.V. All rights
reserved.
Filiaciones:
Mayén J.:
CIICAp-FCQeI Universidad Autónoma del Estado de Morelos, Av.Universidad 1001Col.Chamilpa, C.P.62209 Cuernavaca, Morelos, Mexico
Serna S.A.:
CIICAp-FCQeI Universidad Autónoma del Estado de Morelos, Av.Universidad 1001Col.Chamilpa, C.P.62209 Cuernavaca, Morelos, Mexico
Campillo B.:
Univ Nacl Autonoma Mexico, Fac Quim, Mexico City 04510, DF, Mexico
UNAM, ICF, Cuernavaca 62210, Morelos, Mexico
Flores O.:
Univ Nacl Autonoma Mexico, Fac Quim, Mexico City 04510, DF, Mexico
UNAM, ICF, Cuernavaca 62210, Morelos, Mexico
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