Fretting is a phenomenon that occurs at the contacts of surfaces that are subjected to oscillatory relative movement of small amplitudes. Depending on service conditions, fretting may significantly reduce the service life of a component due to fretting fatigue. This paper analyses finite element models to reproduce results of recent laboratory studies. Specifically, it observes if any singularities are present under the contact zone and analyses convergence rates in terms of contact width and coefficient of friction. Recommendations for mesh sizes for analyses of fretting problems are proposed as a result of this research.
COBISS.SI-ID: 29649703
A strong form numerical meshless method based on a local Weighted Least Squares approximation is used to solve the Cauchy-Navier equation for steady state linear elasticity problems. Advantages, such as its generality in terms of approximation setup and positions of computational nodes of the employed numerical approach, are explored. Two irregular cases are considered, first a drilled cantilever beam, where an irregular domain is treated with an original nodal positioning algorithm, and a Hertzian contact problem, where an refinement algorithm is used to extensively refine discretization under the contact area. The main contribution of the paper is demonstration that the strong form meshless methods can be used to effectively solve difficult problems with irregular geometry or high local stress concentrations.
COBISS.SI-ID: 31107623
This paper presents an initial investigation in parallelizing the numerical simulation of fretting fatigue under realistic conditions, i.e., with cyclic non-proportional loading, for evaluation of the crack initiation and crack propagation. The fretting fatigue simulation problem requires the modelling of contact, friction, stick and slip conditions, the crack initiation phase, and crack propagation. Parallelization difficulties are caused already by the non-linearities of the model, which are localised on the interfaces between components. Even more difficulties arise from the crack propagation, where the regions surrounding the tips of cracks, require a much more precise treatment than the rest of the domain and therefore present a computational burden.
COBISS.SI-ID: 30529575