Analysis of Fretting Fatigue of Cavitation Shotless Peened Ti–6Al–4V

Abstract

Fretting fatigue behavior of cavitation shotless peened titanium alloy, Ti-6Al-4V coupons was investigated using finite element method and a critical planebased multi-axial fatigue parameter. Cavitation shotless peening (CSP)-induced compressive residual stress, which was larger at the contact surface than its counterpart from the shot peening (SP). However, compressive residual stress decreased more sharply with distance from the contact surface in CSP than in SP. Analysis using a critical plane-based multi-axial fatigue parameter demonstrated that the crack initiation would occur inside the cavitation shotless peened specimen which matched with the experimental observations. On the other hand, crack initiation would occur on the contact surface in the shot peened specimen which again was in agreement with experiments. The analysis also showed that the crack propagation part of the total fretting fatigue life was longer in the shot peened specimen than in the cavitation shotless peened specimen while the crack initiation part was almost equal from both peening methods. Therefore, CSP could not improve the fretting fatigue life/strength as much as the SP did but it improved relative to the un-peened specimen.

Improving the fretting and corrosion fatigue performance of 300M ultra-high strength steel using the ultrasonic surface rolling process

“…Similar to clamping stress, compressive residual stress can also close up FF cracks in the early stages of FF crack propagation [45]. Therefore, the early FF crack propagation rate is significantly reduced by the induction of large compressive residual stress in the near-surface region after USRP treatment [46][47][48][49]. In summary, the compressive residual stress introduced by USRP treatment can improve the FF resistance of 300M steel.…”

Cavitation Peening: A Review

“…As cavitation peening is shotless peening, as mentioned above, cavitation peening can introduce compressive residual stress and work hardening with less of an increase in surface roughness in comparison with other processes. Thus, cavitation peening improves the fretting fatigue properties and/or pitting resistance [37,[146][147][148]. The pressure distribution of individual cavitation impact was evaluated using a magnesium-oxide single crystal, and the authors concluded that the highly intense impact was applied to the center [149].…”

Two-Dimensional and Three-Dimensional Finite Element Analysis of Finite Contact Width on Fretting Fatigue

“…As a result, cracks are initiated in the contact zone and the unexpected and/or premature failures under the fretting condition have been observed in many structural components at stress levels below the fatigue limit of materials. [1][2][3][4][5][6][7][8][9][10][11] One of the most common examples, where the mechanical failure is caused by fretting fatigue, is the dovetail joint of the blade and disk attachments in gas turbine engines.…”