Cleavage Stress Required to Produce Fracture Path Deflection in Cold-Drawn Prestressing Steel Wires |
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Authors: | J. Toribio B. González J. C. Matos |
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Affiliation: | (1) Department of Materials Engineering, University of Salamanca EPS, Campus Viriato, Avda Requejo 33, 49022 Zamora, Spain |
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Abstract: | Cold-drawn prestressing steel wires exhibit strength anisotropy in the form of fracture path deflection towards a direction approaching the wire axis, or cold drawing line, as a consequence of the pearlitic microstructure orientation induced by the manufacturing procedure. Such a crack path deflection is initiated at certain nuclei (fracture origins) at which axial cracking appears in the cold drawing direction (or wire axis) in the form of micro-cleavage units that produce in the load-displacement curve a macroscopic phenomenon of pop-in. This paper shows that such fracture initiators appear at a certain distance from the fatigue pre-crack tip at which a local maximum of the cleavage stress is located. |
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Keywords: | cold drawn steel cleavage stress fracture path deflection anisotropy |
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