Experimental Study of the Fatigue Crack Propagation and Overloading Retardation in TA2 Plate

Abstract:

In this paper, I+II mixed mode notch-crack fatigue propagation in titanium alloy steel TA2 was tested with the emphasis on the crack mode transition and retardation under constant amplitude loading or overloading. Finite element method was employed to calculate the stress distribution at the crack tip in order to explain the crack growth behavior. It is found that after initiation from the crack tip, the new formed crack propagates in a mode I form, regardless of the magnitudes of the inclined angle of the crack and the overloading applied. The relationship between the fatigue crack growth rate and mode I stress intensity factor range was calculated. After overloading, crack initiation and propagation will be significantly slowed, or in other words, there exists overloading retardation. Calculation shows that after overloading, a plastic zone with residual compressive stress is formed which is responsible for the retardation of the crack growth rate. Micro-morphologies of the crack growth path and the crack fracture surface were also observed and analyzed.

• Periodical: Advanced Materials Research (Volumes 1120-1121)
• Pages: 1008-1013
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.1008
• Online since: July 2015
• Authors: Hui Fang Li, Yuan Hong, Cai Fu Qian
• Keywords: Crack Growth Path, Fatigue Overloading Retardation, Mixed Mode Fatigue Crack, Morphology

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