首页|Very high cycle fatigue analysis of high strength steel with corrosion pitting

Very high cycle fatigue analysis of high strength steel with corrosion pitting

扫码查看
原文链接
  • NETL
  • NSTL
  • Trans Tech Publications Ltd
This work deals with very high cycle fatigue tests on high strength steel subject to the corrosive action of salt solution. Tests were carried out at constant load ratio R = -1 on corrosion treated and non-treated specimens and sea water flow specimens of R5 steel, which according to an International Classification Society of offshore systems is steel graded with the highest ultimate tensile strength to manufacture mooring chains and accessories intended to position mooring applications such as mooring of mobile offshore units, mooring of floating production units and mooring of offshore loading systems. Fatigue endurance on pre-corroded specimens was quite dispersed but with a mean value of 360 MPa, whereas for the non corroded specimens the fatigue endurance was located between 420 MPa at 10~5 - 10~6 cycles, and 380 MPa at 10~9 cycles. Concerning the sea water flow specimens, important increase in fatigue life is observed in reducing the applied load. Dispersion on fatigue endurance for the pre-corroded and sea water flow specimens was related to the complex process of corrosion on the specimen surface; nevertheless, the resulting pitting holes were associated to fracture origin in these specimens. Furthermore, fatigue failure origin was systematically localized at a circular, elliptical or irregular surface pitting hole formed during the corrosion process; special attention was focused on the pitting holes related to fatigue failure. Finite element results were obtained for the hemispherical voids placed on the specimen surface in order to determine the corresponding stress concentration; these results were associated with the real fracture origin pitting holes observed on specimens with pre-corrosion and sea water flow corrosion. Finally, some conclusions were obtained concerning pitting holes, stress concentration and fatigue life for the pre-corroded and sea water flow corroded specimens.

high cycle fatiguehigh strength steelpre-corroded and sea water flow corroded specimenspitting holesstress concentration

Ruben PEREZ MORA、Gonzalo DOMINGUEZ ALMARAZ、Thierry PALIN-LUC、Claude BATHIAS、Jose Luis ARANA

展开 >

Arts et Metiers ParisTech, Universite Bordeaux 1, LAMEFIP, Esplanade des Arts et Metiers, 33405 Talence Cedex, France Advanced Technology Center of Queretaro (CIATEQ), 76150 Santiago de Queretaro, Mexico

University of Michoacan (UMSNH ), Santiago Tapia 403, 58000 Morelia, Mexico

Arts et Metiers ParisTech, Universite Bordeaux 1, LAMEFIP, Esplanade des Arts et Metiers, 33405 Talence Cedex, France

Universite Paris X, LEME, 50 rue de Sevres, 92410 Ville d'Avray, France

University of the Basque Country, ETSI, c/Alameda de Urquijo s/n, 48013, Bilbao, Spain

展开 >

2010

10.4028/www.scientific.net/KEM.449.104

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.449
  • 2
  • 19