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Structural Engineering and Mechanics   Volume 14, Number 2, August 2002, pages 209-221
A fracture criterion for high-strength steel cracked bars
Toribio J

Abstract     [Buy Article]
    In this paper a fracture criterion is proposed for cracked cylindrical samples of high-strength prestressing steels of different yield strength. The surface crack is assumed to be semi-elliptical, a geometry very adequate to model sharp defects produced by any subcritical mechanism of cracking: mechanical fatigue, stress-corrosion cracking, hydrogen embrittlement or corrosion fatigue. Two fracture criteria with different meanings are considered: a global (energetic) criterion based on the energy release rate G, and a local (stress) criterion based on the stress intensity factor K-1. The advantages and disadvantages of both criteria for engineering design are discussed in this paper on the basis of many experimental results of fracture tests on cracked wires of high-strength prestressing steels of different yield strength and with different degrees of strength anisotropy.
Key Words
    high-strength steel, cracked cylindrical bars, stress intensity factor, energy release rate, fracture criterion
Toribio J, Univ Salamanca, Dept Mat Engn, EPS, Campus Viriato,Avda Requejo 33, Zamora 49022, Spain
Univ Salamanca, Dept Mat Engn, EPS, Zamora 49022, Spain

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