Modeling interfacial conditions in nominally flat contacts for application to fretting fatigue of turbine engine components
✍ Scribed by P.A McVeigh; G Harish; T.N Farris; M.P Szolwinski
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 486 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0142-1123
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✦ Synopsis
The area of contact between the blade root and disk in high-performance turbomachinery has been identified as a critical area for the nucleation of fatigue damage leading to premature and often catastrophic component failures. The interaction of small-scale relative displacements or microslip at the contact surfaces and sharp gradients in the near-surface contact stress field drives a damage process known as fretting. This paper presents and compares two computational approaches -one relying on a quasi-analytical formulation and another employing the finite element method -for characterizing the interfacial conditions arising in experimental set-ups used to simulate conditions of fretting in blade/disk contacts. The quasi-analytical formulation provides a computationally efficient approach for analyzing arbitrary contacting profiles. It is also shown that predictions from the analyses compare favorably with interfacial damage observed in an on-going series of fretting fatigue tests of a titanium alloy used commonly in turbomachinery components, Ti-6Al-4V.