Author(s):
Costa, J. D. M. 
; Ferreira, J. A. M.
Date: 1998
Persistent ID: http://hdl.handle.net/10316/4326
Origin: Estudo Geral - Universidade de Coimbra
Document details
Effect of stress ratio and specimen thickness on fatigue crack growth of CK45 s...
Description
Presented are the effect of stress ratio and thickness on the fatigue crack growth rate of CK45 steel according to DIN 17200. Test results are obtained for constant amplitude load in tension with three stress ratios of R=0, 0.2 and 0.4 and three specimen thicknesses of B=6, 12 and 24 mm. Microgauge crack opening values were used to calculate [Delta]Keff values from which the da/dN - [Delta]Keff curves are obtained. Crack closure can be applied to explain the influence of mean stress and specimen thickness on the fatigue crack growth rate in the second regime of the two-parameter crack growth rate relation. An empirical model is chosen for calculating the normalized load ratio parameter U as a function of R, B and [Delta]K and, for correlating the test data. http://www.sciencedirect.com/science/article/B6V55-3V8TRRM-7/1/30b355cbece80979b41af9ced44b57ad
Presented are the effect of stress ratio and thickness on the fatigue crack growth rate of CK45 steel according to DIN 17200. Test results are obtained for constant amplitude load in tension with three stress ratios of R=0, 0.2 and 0.4 and three specimen thicknesses of B=6, 12 and 24 mm. Microgauge crack opening values were used to calculate [Delta]Keff values from which the da/dN - [Delta]Keff curves are obtained. Crack closure can be applied to explain the influence of mean stress and specimen thickness on the fatigue crack growth rate in the second regime of the two-parameter crack growth rate relation. An empirical model is chosen for calculating the normalized load ratio parameter U as a function of R, B and [Delta]K and, for correlating the test data. http://www.sciencedirect.com/science/article/B6V55-3V8TRRM-7/1/30b355cbece80979b41af9ced44b57ad
Document Type
Article
Language English
Language English
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