Influence of nonmetallic inclusions on fatigue crack growth in a structural steel |
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Authors: | A Barbangelo |
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Affiliation: | (1) Istituto di Meccanica Applicata alle Macchine, Università di Genova, Via all'Opera Pia 15/A, 16145 Genova, Italy |
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Abstract: | A study of the fatigue behaviour of a hardened and tempered steel, at two inclusion levels, has been carried out according to the linear elastic fracture mechanics criteria. The influence of inclusions on the fatigue crack growth rate has turned out to be a function of the local stress intensity factor range,K
I, at which fracture propagates. At lowK
I values, to which are related crack growth rates less than 10–5 mm cycle–1, the crack growth rate in the steel with higher inclusion content is lower than in the steel with lower inclusion content. AsK
I increases, an inversion in the difference between the two rates occurs. In the dirtier steel, the higherK
I, the higher the growth rate than in the other steel. The difference between the two rates becomes nil just below the fast propagationK
Ic level. By fractographic analysis, it has been possible to find out how inclusions affect fatigue behaviour. |
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Keywords: | |
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