Abstract
AbstractA study was undertaken of tension–tension, fatigue crack propagation of two high strength, low alloy steel (S3 and S4) sheets at mean and maximum stresses of 30 and 55% of their tensile strengths, respectively, and results were compared with those from a hot rolled, low carbon steel (S1). The maximum life in terms of number of cycles to fracture was shown by steel S1, while S4, with a bainitic microstructure, showed the minimum. The S3 steel, with a ferrite–pearlite microstructure, showed a fatigue life between the other two. These results are in accordance with the tensile strength/yield strength ratios of the alloys. Further work on S4 steel was carried out in greater detail and tensile to shear transition behaviour of the fatigue crack front was observed. Correlations were established between microstructure, stress intensity, and the rate of crack propagation. The commencement of shear lip development in the bainitic steel was found to be independent of the sheet thickness, but dependent upon t...
Published Version
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