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Structural Engineering and Mechanics Volume 14, Number 2, August 2002 , pages 209-221 DOI: https://doi.org/10.12989/sem.2002.14.2.209 |
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A fracture criterion for high-strength steel cracked bars |
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Toribio J
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| Abstract | ||
| 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 | ||
| Address | ||
| 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 | ||