Anssi Laukkanen

TL;DR: In this paper, the authors discussed the tribological mechanisms, scale effects and surface parameters influencing the friction and wear of diamond and DLC-coated surfaces and showed how surface 3D FEM modelling generates stress and strain values at the nano level, within bond layers at coating/substrate interfaces and around cracks and forms the basis for better understanding the origin of wear.

TL;DR: In this article, a three-dimensional finite element model for describing the elastic and plastic behavior and for calculating the stresses and strains has been developed, which shows that the maximum first principal tensile stress is generated in the back-tail region at the border of the scratch groove, creating the first visible angular cracks in the coating.

TL;DR: In this paper, the authors analysed the stress and fracture conditions of a coated surface, that are the origin to wear, by three-dimensional finite element method (FEM) modelling on micro-level, by stress and strain computer simulations and by experimental studies with a scratch tester.

TL;DR: Residual stresses in TiN, DLC and MoS2 coated surfaces with regard to their tribological fracture behaviour were investigated in this article. But the results showed that the residual stresses in these surfaces varied with the thickness of the surfaces.

TL;DR: In this paper, a micro-scale finite element method (FEM) modelling and stress simulation of a 2μm TiN-coated steel surface was carried out and showed a reduction of the generated tensile buckling stresses in front of the sliding tip when compressive residual stresses of 1GPa were included in the model. However, this reduction is not similarly observed in the scratch groove behind the tip, possibly due to sliding contact-induced stress relaxation.