Analysis of the Effect of Load Ratio on Fatigue Crack Growth

Abstract:

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In this paper, fatigue test and numerical simulation are carried out for Q345 weld joint under constant amplitude loading at different R-ratio using the compact tension samples with 3.8mm thickness. The result indicates that fatigue crack growth rates in the base metal is not sensitive to R-ratio, but the fatigue crack growth rates increases in the weld zone with R-ratio increasing. The effect of R-ratio on fatigue crack growth is analyzed based on J-S cycle plasticity model and Jiang’s multiaxial fatigue criterion. The finite element method (FEM) is used for the stress-strain analysis with the implementation of an accurate J-S cyclic plasticity model. With the detailed stresses and strains, fatigue damage assessment is made using a Jiang’s multiaxial fatigue criterion.

Info:

Periodical:

Advanced Materials Research (Volumes 181-182)

Edited by:

Qi Luo and Yuanzhi Wang

Pages:

330-336

DOI:

10.4028/www.scientific.net/AMR.181-182.330

Citation:

Y. Xiong "Analysis of the Effect of Load Ratio on Fatigue Crack Growth", Advanced Materials Research, Vols. 181-182, pp. 330-336, 2011

Online since:

January 2011

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$35.00

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