Abstract
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+3Δτ2Under 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.db/dN=A(ΔKIb)mA=(AR=0)1/r*r*={1+(σst/Δτ)1/2/7 (Region IIa) 1 (Region IIb)AR=0={2.16×10-5×0.230m (Region IIa) 3.64×10-5×0.147m (Region IIb)m={f(σ2/σ1) (Region IIa) g(σ2/σ1) (Region IIb)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Society of Materials Science, Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
