[en] Turbomachinery components often exhibit a nonlinear behaviour due to the localised
nonlinearities introduced by friction interfaces [1]. The influence of the contact interfaces
on the vibration response cannot be neglected, as it can lead to significant dissipation
and frequency shift of the dynamic response of the mechanical components. Various
modelling approaches have been used at the Imperial College London Vibration UTC,
mainly characterised by a discretisation of the contact interface using a set of node-to-
node friction contact elements [2]. An improved modelling approach is proposed here, in
which the contact interface is discretised using zero-thickness finite elements [3].
The contact physics includes the micromechanical interaction at the asperity level by
employing an advanced microslip law which accounts for coupled normal-tangential dis-
placements. A strategy is proposed to link the physical parameters of the contact surfaces,
such as roughness, hardness and Youngs modulus to the microslip law used for the zero
thickness elements. The flexibility of this approach allows the adoption of different con-
tact laws with any level of detail, depending of the requirements of the application. The
modelling approach is illustrated with a realistic test case, and its predictive performance
are evaluated highlighting the advantage of this approach compared to more simplistic
models.
Disciplines :
Mechanical engineering
Author, co-author :
Pesaresi, L
Wong, C
Salles, Loïc ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M) ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Vibration of Turbomachines ; Imperial College London > Mechanical Engineering > Vibration University Technology Center
Language :
English
Title :
A modelling approach for contact interfaces in nonlinear dynamics.
Publication date :
2018
Event name :
6th European Conference on Computational Mechanics (ECCM 6)
