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Based on the concept of strain-energy density, the Smith-Watson-Topper (SWT) parameter is corrected by introducing the mean stress-sensitivity factor to reflect the material’s sensitivity to mean stress. In order to model the experimental data better, the mean stress-sensitivity factor is re-defined in three regimes in the Haigh diagram, which is different from the definition in the FKM Guideline. Procedures to determine the mean stress-sensitivity factor are also presented using the experimental data gained for two boundary states. Experimental verifications show that the modified criterion gives satisfactory results for all the six checked materials.

An improved strain-energy density model considering the effect of mean stress