Abstract

MARTINEZ, Alexander; JAIMES, Alban; SERNA, Aníbal  and  URIBE, Iván. DEVELOPMENT OF A CORRELATION TO ESTIMATE THE FATIGUE STRENGTH FOR STEELS BASED ON LOW-COST TEST. C.T.F Cienc. Tecnol. Futuro [online]. 2010, vol.4, n.2, pp.71-81. ISSN 0122-5383.

Fatigue cracking in metallic materials occurs mainly due to the effect of cyclic stresses and their variation of magnitude over time. To evaluate the fatigue strength based on S-N curves, many tests are needed, which require a lot of time and incur high costs. For this research, several tests were conducted on samples of high-strength steels to determine their mechanical properties, chemical composition and fatigue. It was found that impact toughness Charpy V Notch , the percentage of alloying elements and the mechanical properties show a positive lineal effect in relation to the fatigue strength of the materials evaluated. Considering this behavior, a correlation to predict the fatigue strength of the steel was developed based on the Charpy impact energy, the yield strength, the ultimate strength, and the hardness of the material; thisa correlation shows a very good fit with the experimental fatigue data The main advantage of this correlation is that the estimation of fatigue strength is based on very low cost tests.

Keywords : fatigue prediction; fatigue strength; fatigue test; impact resistance; tensile strenght; toughness.

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