Influencia de las tensiones residuales en el ensayo de tracción de los aceros de pretensado

Influence of residual stresses on the tensile test of prestressed concrete wires

The aim of this paper is to show the influence of residual stresses, due to cold-drawing, on the tensile test of steel wires for prestressed concrete. It has been shown that residual stresses affect the shape of the tensile stress-strain curve and particularly influence on the ratio ó0,2/ómax. It was found that residual stresses favours the onset of yielding and the ratio f 0,2/f max decreases with increasing values of residual stresses. Because of the deleterious effect of residual stresses on fatigue and stress corrosion, it is reasonable to put a lower limit to f 0,2/f max in the standards. Also, it has shown the influence fo post-drawing treatments on residual stresses and on the ratio f 0,2/f max.