  This paper deals with modelling the effect of wear on the dynamics of the
shrouded bladed disk with frictional contacts at the shrouds and the contact
interface evolution. Prediction of fretting wear commonly occurring at the
contacts of turbomachinery components, and its impact on the dynamics is
increasingly researched due to the components subjected to their structural
limits for performance and operating at high loading conditions. Over a
lifetime, the fretting wear at these contacts could alter the global dynamic
response of these bladed disks from the designed operating point and could lead
to high vibration amplitudes. This study implements a coupled static/dynamic
harmonic balance method (HBM) with wear energy approach and an adaptive wear
logic to study the impact on the steady-state nonlinear dynamic response.
Firstly, the methodology is applied to a cantilever beam with a contact patch
and then to a shrouded bladed disk with shroud contacts using cyclic symmetry
boundary conditions. The novelty of the paper is to show the effect of wear on
the dynamics with the changing contact pre-load using a coupled approach. A
wear acceleration $v_{w,max}$ parameter is defined, and the impact of the
choice of this parameter is discussed in detail on the computation time and the
accuracy of results. The test cases demonstrate the impact of wear on the
dynamic nonlinear response curves and the contact interface evolution for
various scenarios.
