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Influence of residual stresses in the tensile test of cold drawn wires

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Abstract

The aim of this paper is to investigate the influence of residual stresses, due to cold-drawing, on the shape of the tensile stress-strain curve and particularly its influence on the ratio σ0.2/σmax through a numerical and experimental work. It was found that residual stresses favours the onset of yielding and the ratio σ0.2/σmax decreases with increasing values of residual stresses. Because of the deleterious effect of residual stresses on fatigue and stress corrosion and because such stresses affect the ratio σ0.2/σmax, it is reasonable to-put a lower limit to σ0.2/σmax in the standards. The ratio σ0.2/σmax can be increased by relieving residual stresses, a common procedure after drawing. This fact is also ascertained.

Résumé

L'objectif de cet article est la recherche numérique et expérimentale de l'influence des contraintes résiduelles dues au tréfilage à froid sur la forme de la courbe contrainte-déformation et, plus particulièrement, son influence sur le ratio σ0.2/σmax. Cet article montre que les contraintes résiduelles favorisent la plastification. Le ratio σ0.2/σmax diminue au fur et à mesure que les contraintes résiduelles augmentent. À cause des effets négatifs des contraintes résiduelles sur la fatigue et la corrosion des matériaux, il est raisonnable de demander une valeur limite pour σ0.2/σmax. Le ratio σ0.2/σmax peut être augmenté à condition de relâcher les contraintes résiduelles, une procédure normale après le tréfilage.

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Authors and Affiliations

  1. Departamento Ciencia de Materiales, Universidad Politéenica de Madrid, E.T.S.I. Caminos, Madrid, Spain

    J. M. Atienza & M. Elices

Authors
  1. J. M. Atienza
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  2. M. Elices
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Editorial note Prof. Manuel Elices is a RILEM Senior Member.

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Atienza, J.M., Elices, M. Influence of residual stresses in the tensile test of cold drawn wires. Mat. Struct. 36, 548–552 (2003). https://doi.org/10.1007/BF02480832

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  • DOI: https://doi.org/10.1007/BF02480832

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