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The effects of a corrosive environment on crack growth rate in chainsteel / A. Amirat

Public ISBD Titre : The effects of a corrosive environment on crack growth rate in chainsteel Type de document : texte imprimé Auteurs : A. Amirat, Auteur ; W.J. Plumbridge, Directeur de thèse Editeur : Bristol : [s.n.] Année de publication : 1987 Importance : 111 f. Présentation : ill. Format : 30 cm. Note générale : Master of science : Environment : University of Bristol : 1987 Bibliogr. f. 47 - 50 Langues : Anglais (eng) Mots-clés : Corrosive Environment Chainsteel Index. décimale : Ms00787 Résumé : The work presented in this thesis, is a study of the effects of a corrosive environment (3.5% NaC1 solution) on crack growth in tempered chainsteel. Crack growth rates have been investigated in single-edge notched specimens. For growth rates above 10-⁵mm/cycle fatigue crack growth is independent of tempering temperature. A drop of frequency from 78 Hz to 0.6 Hz causes an increase of fatigue crack growth in air by a factor of two. At the lower frequency, in the corrosive environment fatigue crack growth is faster than that in air. These effects are attributed to the fatigue crack tip - environment interaction. Apart from the general observation that Kiscc decreases as the yield strength increases, a significant difference in Kiscc is observed for the 500 °C temper condition according to the specimen location in the heat treated bar. This effect is associated with the hardness difference (10 to 15 Hv30) existing between the outer and inner specimens. Residual stresses in the parent bar after tempering have been found to be compressive at the surface and tensile within the core. However, manufacture of the thin testpiece eliminated most of the residual stresses. The effects of a corrosive environment on crack growth rate in chainsteel [texte imprimé] / A. Amirat, Auteur ; W.J. Plumbridge, Directeur de thèse . - Bristol : [s.n.], 1987 . - 111 f. : ill. ; 30 cm. Master of science : Environment : University of Bristol : 1987 Bibliogr. f. 47 - 50 Langues : Anglais (eng) Mots-clés : Corrosive Environment Chainsteel Index. décimale : Ms00787 Résumé : The work presented in this thesis, is a study of the effects of a corrosive environment (3.5% NaC1 solution) on crack growth in tempered chainsteel. Crack growth rates have been investigated in single-edge notched specimens. For growth rates above 10-⁵mm/cycle fatigue crack growth is independent of tempering temperature. A drop of frequency from 78 Hz to 0.6 Hz causes an increase of fatigue crack growth in air by a factor of two. At the lower frequency, in the corrosive environment fatigue crack growth is faster than that in air. These effects are attributed to the fatigue crack tip - environment interaction. Apart from the general observation that Kiscc decreases as the yield strength increases, a significant difference in Kiscc is observed for the 500 °C temper condition according to the specimen location in the heat treated bar. This effect is associated with the hardness difference (10 to 15 Hv30) existing between the outer and inner specimens. Residual stresses in the parent bar after tempering have been found to be compressive at the surface and tensile within the core. However, manufacture of the thin testpiece eliminated most of the residual stresses.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms00787	Ms00787	Papier	Bibliothèque centrale	Mémoire de Master	Disponible