CONTACT FATIGUE is a surface-pitting-type failure commonly found in ball or roller bearings. This type of failure can also be found in gears, cams, valves, rails, and gear couplings. Contact fatigue has been identified in metal alloys (both ferrous and nonferrous) and in ceramics and cermets. Contact fatigue differs from classic structural fatigue (bending or torsional) in that it results from ...

The present paper discusses the formulation of weight functions for inclined edge cracks in finite width plates, typical Rolling Contact Fatigue defects, to obtain Stress Intensity Factor and T-stress. Because do not depend on load boundary conditions, their use is convenient study subjected complex stress fields, e.g. fretting fatigue rolling contact fatigue, since field calculated uncracked g...

This paper describes a two-dimensional (2D) finite element simulation for fracture and fatigue behaviours of pure alumina microstructures such as those found at hip prostheses. Finite element models are developed using actual Al2O3 microstructures and a bilinear cohesive zone law. Simulation conditions are similar to those found at a slip zone in a dry contact between a femoral head and an acet...

BACKGROUND Passive ankle stability under weight-bearing conditions has been found to depend substantially on the role of the articular surface geometry. In the present study, it was hypothesized that, in the ankle under axial loading, contact-stress changes in response to alterations of external load involve reproducible and specific patterns to maintain ankle stability. METHODS Six cadaver a...

Here the theoretical maximum contact stress is calculated by Hertz equation. Also the finite element analysis of spur gear is done to determine the maximum contact stress by ANSYS 14.5. It was found that the results from both Hertz equation and Finite Element Analysis are comparable. From the deformation pattern of steel and grey cast iron, it could be concluded that difference between the maxi...

ABSTRACT This study aims to establish a methodology for determining the residual contact stress developed during fabrication of nonconductive adhesive (NCA) bonded flip-chip-on-flex (FCOF) microelectronics systems. The method is demonstrated for a selected non-conductive adhesive. Fabrication of an NCA bonded FCOF system requires a compressive force large enough to compensate for the inherent c...

The mathematical models and the corresponding computer program for determination of the hip joint contact force, the contact stress distribution, and the size of the weight bearing area from a standard anteroposterior radiograph are described. The described method can be applied in clinical practice to predict an optimal stress distribution after different operative interventions in the hip joi...