Multiaxial fatigue tests were carried out to investigate the effect of stress components (Δσ, Δτ, σst, τst) on fatigue crack growth. The test method was the combined tension and tortion one in phase loading by using thin-walled hollow cylindrical specimens with pre-cracks. The experiments were carried out under the condition of equal equivalent stress amplitude, Δσeq=√Δσ2 + 3Δτ2 Under the condition of mixed modes, the fatigue crack growth rate increases remarkably with increasing stress ratio. This characteristics is due to the effect of static tensile stress σst on Δτ. In this paper, the effect of static tensile stress was incorporated in the constitutive equation of fatigue crack growth rate under the mixed mode fatigue condition of Δσ and Δτ. Then, the following constitutive equation of fatigue crack growth rate including the effects of Δσ, Δτ, σst and τst was obtained.
|Number of pages||7|
|Journal||Zairyo/Journal of the Society of Materials Science, Japan|
|Publication status||Published - 1990 Aug|
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Metals and Alloys
- Polymers and Plastics