Effect of Grain Size and Load Ratio on the near Threshold Stress Intensity Factor during Fatigue Crack Propagation of Dual Phase Steel

Abstract:

Fatigue crack growth near-threshold stress intensity factor is affected by the microstructure of the material. A large portion of microstructural influence is due to the change in grain size of the material. Grain size in the dual phase steel was varied and found that the near-threshold stress intensity factor (rK_th) increased as the grain size increased. Influence of load ratio nearthreshold fatigue crack propagation was also studied. It was observed that the near-threshold stress intensity range, rK_th for fatigue growth decreased with increasing load ratio.

• Periodical: Key Engineering Materials (Volumes 510-511)
• Pages: 67-74
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.510-511.67
• Online since: May 2012
• Authors: M. Sarwar, E. Ahmad, T. Manzoor
• Keywords: Dual Phase Steel, Fatigue, Grain Size

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