Abstract
Push-pull fatigue tests at various R ratios (σmin/σmax), as well as combined cyclic tension and internal pressure tests with various proportions of each loading were run on a 2.5%Cr-1%Mo steel to investigate separately the effects of a mean stress and of positive stress biaxiality. Fatigue lives were found to decrease with increasing mean stress at fixed biaxiality and a non-linear effect of stress biaxiality on fatigue lives was observed at a fixed R ratio. The damage mechanisms were found to change with both parameters and these modifications were analyzed. Many popular multiaxial fatigue criteria were unable to describe all the data. Thus, a new fatigue criterion based on Gerber's parabola, has been proposed that captures the evolution of the endurance limit under the combined effect of mean stress and biaxial tension.
| Original language | English |
|---|---|
| Pages (from-to) | 90-101 |
| Number of pages | 12 |
| Journal | Procedia Engineering |
| Volume | 133 |
| DOIs | |
| Publication status | Published - 1 Jan 2015 |
| Externally published | Yes |
| Event | 6th Fatigue Design conference, Fatigue Design 2015 - Senlis, France Duration: 18 Nov 2015 → 19 Nov 2015 |
Keywords
- biaxial tension
- damage mechanisms
- fatigue criteria
- fish-eye
- intergranular
- internal crack initiation