Abstract
This study demonstrates the influence of residual stresses in steel wires on the stress relaxation losses. Standard stress relaxation tests were performed on four types of wire, all with the same mechanical properties but with different residual stresses. Surface residual stresses were measured by X-ray diffraction. The experimental results show that stress relaxation losses decrease as the value of surface tensile residual stresses decrease. The role, sometimes controversial, of initial pre-stretching and heat treatments on stress relaxation losses can also be understood in the light of the residual stresses induced during cold-drawing.
Résumé
Cette étude montre l'influence des contraintes résiduelles dans des câbles d'acier sur la perte de contrainte par relaxation. Des essais de relaxation ont été réalisés sur quatre types d'acier, avec les mêmes propriétés mécaniques et différentes contraintes résiduelles. Sur la surface, ces contraintes résiduelles ont été mesurées par diffraction de rayons X. Les résultats expérimentaux montrent que la perte de contrainte par relaxation diminue quand la valeur des contraintes résiduelles sur la surface s'affaiblit. Le rôle, parfois controverse, de la prédéformation et des traitements tehrmiques sur les pertes de contrainte par relaxation peut être expliqué par les contraintes résiduelles entraînées pendant le tréfilage.
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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 stress relaxation of cold drawn wires. Mat. Struct. 37, 301–304 (2004). https://doi.org/10.1007/BF02481675
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DOI: https://doi.org/10.1007/BF02481675