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On the relevance of a microslip contact model for under-platform dampers.pdf
International Journal of Mechanical Sciences 115-116 (2016) 145–156
Contents lists available at ScienceDirect
International Journal of Mechanical Sciences
journal homepage: /locate/ijmecsci
On the relevance of a microslip contact model for under-platform dampers
Chiara Gastaldi n, Muzio M. Gola
Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
article info
Article history: Received 5 March 2016 Received in revised form 2 June 2016 Accepted 18 June 2016 Available online 20 June 2016
Keywords: Microslip Friction Contact model Turbine Bladed disk Damper
abstract
A crucial part of building reliable models for the design of under-platform dampers for turbine blades resides in the appropriate description of the contact conditions, both in the normal and in the tangential direction.
The aim of this paper is to determine to what extent microslip due to the combined non-linearities along the normal and the tangent of non-conforming contact surfaces in?uences the damper behavior. The ultimate goal is to determine whether introducing these features in the contact model would improve the performance of numerical routines used at the blade-damper design stage. In order to explore this problem, a purposely developed contact model is tuned on a single-contact test and then included in the numerical model of a curved-?at damper to simulate its cylindrical interface. The damper numerical routine is then validated against the results from an experimental device purposely developed to test the dynamics of a damper loaded between moving platforms.
It is shown that the validated numerical routine featuring the newly introduced contact model predicts, in comparison with the standard contact model (where partial slip and normal approach nonlinearity are not considered), a lower dissipated energy by an amount that would not be justi?able to neglect.
2016 Elsevier Ltd. All rights reserved.
1. Introduction
In the frame of damper design the main object in the literature
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