Size effect in contact fatigue

Contact Fatigue

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 ...

Fatigue Fracture of High-Strength Concrete and Size Effect

Results of an cxperimelllal srudy ,,(fatiguefmelllre of geometrical/y similar high·strength concrete specimens of ven different si~es are reported and anal\'~ed. Three·poilll bend notched hean1.1 1.5. 4.24. and J:! in. deep were subjected 10 eselic loading H'ith a "m'er load limit of O.07Pc and an upper limiT het1l'een 0.73 and O.1!4 Pc. where Pc = maximum load ill monOlonic loading. The number...

Rolling Contact Fatigue in Ultra High Vacuum

The Effect of Ferrite Grain Size on the Fatigue Behavior of Ferrite-martensite Dual-phase Steels

The effect of ferrite grain size on the fatigue and tensile properties of dual phase steels with a 0.25 volume fraction of martensite (Vm) under different heat treatments was investigated. The heat treatments were homogenized at 1200 oC along with several subsequent normalizations at 910 oC, resulting in different microstructures and mechanical properties. After heat treatment, the obtained ste...

NUMERICAL INVESTIGATION OF CRACK ORIENTATION IN THE FRETTING FATIGUE OF A FLAT ROUNDED CONTACT

The growth of slant cracks by fretting fatigue of a half plane in contact with a flat rounded pad was studied. The mode I and mode II stress intensity factors for cracks of various lengths and directions were calculated using the semi-analytical method of the distribution of dislocations, and their cumulative effect on the crack growth was investigated using the strain energy density criterion....