Mechanical Behavior Laboratory University of Nevada, Reno

Paper

[J54] Gao, Z., Zhao, T., Wang, X., and Jiang, Y., 2009, "Multiaxial Fatigue of 16MnR Steel," ASME Journal of Pressure Vessel Technology, Vol.131, 021403. doi: 10.1115/1.3008041

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Paper Abstract

Uniaxial, torsion, and axial-torsion fatigue experiments were conducted on a pressure vessel steel, 16MnR, in ambient air. The uniaxial experiments were conducted using solid cylindrical specimens. Axial-torsion experiments employed thin-walled tubular specimens subjected to proportional and nonproportional loading. The true fracture stress and strain were obtained by testing solid shafts under monotonic torsion. Experimental results reveal that the material under investigation does not display significant nonproportional hardening. The material was found to display shear cracking under pure shear loading but tensile cracking under tension-compression loading. Two critical plane multiaxial fatigue criteria, namely, the Fatemi-Socie criterion and the Jiang criterion, were evaluated based on the experimental results. The Fatemi-Socie criterion combines the maximum shear strain amplitude with a consideration of the normal stress on the critical plane. The Jiang criterion makes use of the plastic strain energy on a material plane as the major contributor to the fatigue damage. Both criteria were found to correlate well with the experiments in terms of fatigue life. The predicted cracking directions by the criteria were less satisfactory when comparing with the experimentally observed cracking behavior under different loading conditions.

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Paper Figures

Fig. 3

Fig. 3. Monotonic stress-strain curve (Download data).

Fig. 4

Fig. 4. Monotonic shear stress-shear strain curve (Download data).

Fig. 5

Fig. 5. Strain-life fatigue curve from fully reversed uniaxial experiments (Download data).

Fig. 6

Fig. 6. Cyclic stress-strain curve (Download data).

Fig. 8

Fig. 8. Base line experimental data for determining the fatigue constants in the Fatemi-Socie criterion (Download data).

Fig. 9

Fig. 9. Comparison of observed fatigue life and prediction obtained by using the Fatemi-Sociecriterion(Eq.) (Download data).

Fig. 10

Fig. 10. Comparison of the observed fatigue life and prediction obtained from using the Jiang criterion(Eqs.) (Download data).

Fig. 11

Fig. 11. Determination of the predicted cracking orientation (Download data).

Fig. 12

Fig. 12. Comparison of the experimentally observed cracking orientation with the predictions based on the Fatemi-Sociecriterion for the tubular specimens under combined axial-torsion loading (Download data).

Fig. 13

Fig. 13. Comparison of the experimentally observed cracking orientation with the predictions based on the Jiang criterion for the tubular specimens under combined axial-torsion loading (Download data).

Fig. 14

Fig. 14. Cyclic stress-plastic strain curve for 16MnR steel (Download data).

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