Wear Mechanism

Wear mechanism mechanism

Wear can be defined as the progressive progressive loss of  substance substance resulting from mechanical interaction interaction between two contacting surfaces. Wear occurs because of the local mechanical failure of highly stressed interfacial zones and the failure failure mode will often be influenced by environmental factors.

ADHESIVE Adhesion refer to the

ability of atomic structures to hold themselves together and form surface bonds with other atoms or surfaces with which they in intimate contact.

WEAR

ABRASION Abrasion caused by hard

protrusions or particles is very similar to that which occurs during grinding and can be likened likened to a cutting or machining operation, operation, though a very inefficient one by comparison.

CONTACT FATIGUE Fatigue mechanisms can operate under sliding wear conditions, they tend to occupy a much more prominent position in rolling rolling contact where the stresses are high and slip is small.

FLUID AND CAVITATION EROSION Both

these wear mechanisms arise from essentially the same cause, namely the impact of fluids at high velocities. In the case of fluid erosion, the damage is caused by small drops of liquid, whilst in the case of cavitation, the impact arises from the collapse of  vapou vapourr or gas bubble bubbless formed formed in contact with a rapidly moving or vibrating surface.