materjali pinnakihis vahelduva koormuse (kontaktpingete) tagajärjel tekkinud mikropragudest põhjustatud materjali murenemine (vt kulumine; vrd piting)
Hea teada
Kontaktväsimusele on iseloomulik pragude esialgne moodustumine pinnaalustes kihtides edasise levikuga pinnale. Selline pindade purunemise mehhanism esineb laagrite ja hammasrataste kontakteeruvatel pindadel jms
a failure mechanism associated with Hertzian contact (shear) stresses that are maximal at the subsurface (see: wear; compare: pitting)
Hea teada
Cracks are initiated at the subsurface and propagate toward the outer surface. The final stage is removal of a particle from the material. This phemomenon is common in bearings, gears, and rolling parts under loads.
