Abstract
We present a non-intrusive in situ measuring method to obtain the mean coefficient of friction (COF) in a common edge contact of complex shape. The significance of COF on computed contact stresses, and thus on predicted lifetime compels us to develop an accurate derivation method. A dovetail specimen, accounting for the blade/disk interface of gas turbine engines, is subjected to static uniaxial tension, and displacements fields are measured on the lateral face, near contact, with Digital Image Correlation. A Finite Element Method Updating identification is employed to identify the mean COF at any loading cycle operating within the full-slip regime. The numerical model is first validated through a series of virtual tests. Application to a Low-Cycle Fatigue test shows an increase of the COF with the number of cycles. The study also brings to light the high sensibility of the specimen to geometrical positioning.
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This work was supported by Safran Helicopter Engines, France and ANRT, France (CIFRE Grant # 2019/1395).
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AH stands for the major contribution to all parts and was also the one developing the numerical solution procedure and running the simulations. The experimental set-up was made by PC. All authors contributed to the conceptualization and methodology. All authors reviewed and approved the final manuscript.
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Hingue, A., Chaise, T., Chaudet, P. et al. In Situ Friction Coefficient Measurement of Complex Contact Configuration from Dialog Between Digital Image Correlation and Numerical Modeling. Tribol Lett 71, 93 (2023). https://doi.org/10.1007/s11249-023-01767-8
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DOI: https://doi.org/10.1007/s11249-023-01767-8