INVESTIGADORES
CHAPETTI mirco Daniel
artículos
Título:
Effect of Residual Stresses and inclusion size on fatigue resistance of parabollic steel springs
Autor/es:
N. GUBELJAK; J. PREDAN; CHAPETTI, M D
Revista:
MATERIALPRUFUNG
Editorial:
CARL HANSER VERLAG
Referencias:
Lugar: Berlin, Germany; Año: 2014 vol. 56 p. 312 - 317
ISSN:
0025-5300
Resumen:
The effect of inclusion size and residual stresses of spring steel grade
51CrV4 on fatigue lifetime in high cycle was investigated by experimental
results obtained by fatigue testing. Since spring with obvious surface
defects or inclusions at the surface are failed during pre-stress, the
residual stress profile under surface becomes relevant for fatigue crack
initiation and failure. Investigation shows that fatigue threshold for high
cycle fatigue depends, besides residual stresses, on inclusion size and
material hardness. In order to determine allowed size of inclusions in
spring steel and the influence of residual stresses, the Murakami?s and
Chapetti?s models and concepts have been used. The stress loading limit
regarding inclusion size and applied stress has been determined for
loading ratio R = -1 and 0.1 on specimens with and without residual
stresses.