Adhesive transfer in aero-engine abradable linings contact

Fois, N.; Stringer, Jonathan; Marshall, Matthew

doi:10.1016/j.wear.2013.04.033

Cited by 51 publications

(64 citation statements)

References 15 publications

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“…A similar analysis was performed for all of the incursion rates investigated, and the adhesion rate was found to rapidly drop as incursion rate increased ( Figure 9). Also included in the figure is data recorded in a previous study [2], where a similar relationship was observed to this series of tests. It should be noted in the comparative data that the negative adhesion rate at an incursion rate of 2 micrometres per pass corresponds to blade wear, and that in general the softer coating was characterised by a higher rate of adhesion.…”

Section: Wear Mechanism and Adhesion Ratesupporting

confidence: 71%

“…The incursion speed is the rate at which the stage motor advances the abradable sample in the Z-axis direction. Previous research has identified this as the dominant parameter with respect to the wear mechanics, and that through the range of test conditions selected, similar wear mechanisms to those observed in aero-engines are obtained [1,2]. Table 1 summarizes the different incursion conditions investigated.…”

Section: Test Parametersmentioning

confidence: 82%

“…The stroboscopic set up images the blade tip, and allows the investigation of adhesion and wear rates [2]. The set-up is composed of an LED, LED Strobe controller, light gate, and CMOS camera with a macro zoom lens.…”

Section: Stroboscopic Imaging Set Upmentioning

confidence: 99%

“…The adhesion rate in the steady state period is calculated as the rate of change of blade length with respect to theoretical rub length [2]. Figure 8a shows an example of the region of steady-state adhesion (grey area), as measured for Test 1 at 0.02 micrometers per pass.…”

Section: Wear Mechanism and Adhesion Ratementioning

confidence: 99%

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An investigation of the relationship between wear and contact force for abradable materials

Fois

Watson

Stringer

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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Abradable linings are frequently used on the inside of aero-engine casings. During the operation of engine, the rotating blades may strike the lining of the casing. The wear mechanisms present during these incursions have been re-produced on a scaled test rig platform. Previously, characterisation of the wear has been performed using a stroboscopic imaging technique in order to identify the different wear mechanisms at the incursion conditions investigated. In the present study a dynamometer has been included in the test arrangement allowing the measurement of the contact force. This approach has then been combined with sectioning of the abradable test samples, in order to investigate the material response to the different incursion conditions. The wear results, the cutting force and material structure post-incursion show a high degree of correlation. At low incursion rates, significant consolidation and solidification of abradable material was observed, whilst at the same time adhesive transfer to the blade was recorded along with a low tangential to normal force ratio.At high incursion rates, little solidification and consolidation was observed, together with negligible adhesion and a higher tangential force, suggesting a cutting mechanism.Transitions in material behaviour, wear mechanism, and force ratio were observed at the same incursion condition, further highlighting the link between the different experimental measurements.

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Section: Wear Mechanism and Adhesion Ratesupporting

confidence: 71%

Section: Test Parametersmentioning

confidence: 82%

Section: Stroboscopic Imaging Set Upmentioning

confidence: 99%

Section: Wear Mechanism and Adhesion Ratementioning

confidence: 99%

See 2 more Smart Citations

An investigation of the relationship between wear and contact force for abradable materials

Fois

Watson

Stringer

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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show abstract

“…This anomalous phenomenon could be due to the coating adhesion to the blade tip and the blade damage taking place at the same time [18]. Other causes may include the difference in density between the coating and the blade, adhesive coating materials just covering parts Friction 4(2): 176-190 (2016) of the blade surface, peeling of the adhesion layer from the blade tip, and so on.…”

Section: Wear Status Of the Bladementioning

confidence: 99%

Tribological behaviors of turbofan seal couples from friction heat perspective under high-speed rubbing condition

et al. 2016

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Abstract:The tribological behaviors of two types of seal coatings, nickel-graphite and aluminum-hexagon-boron nitride (Ni-Cg and Al-hBN, respectively) versus a Ti-6Al-4V blade used in turbofan engines were investigated using a high-speed rubbing test. The wear status and damage mechanism of the friction couples were studied and the abradability of the seal coatings was evaluated. By analysis of the coating properties and damage mechanism of the seal couple, the friction heat effect was identified as the key factor influencing blade wear forms as well as coating abradability. A one-dimensional heat conduction model was established to estimate the effect of increasing temperature on the friction interface. The results indicated that in the Ni-Cg and Ti-6Al-4V seal couple, the temperature rising rate (TRR) of the Ti-6Al-4V blade was faster than that of the Ni-Cg coating, and so the Ti-6Al-4V blade softened earlier than the Ni-Cg coating, causing the blade to suffer severe wear. In the Al-hBN and Ti-6Al-4V seal couple, the TRR of the Ti-6Al-4V blade was slower than that of the Al-hBN coating, and so the Al-hBN coating softened first; thus, blade damage was reduced or even replaced by coating adhesion. The square root ratio of thermal diffusivity between the blade and the coating could be taken as an indicator of the ratio of TRR between the blade and coating to predict blade wear status as well as damage mechanism. The results of the model agreed well with the experiment results of the two seal couples used in this study.

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