Under repeated alternating stress, the material contact surface or sub-surface gradually cracked or spalling (Spalling) phenomenon, known as fatigue wear. Fatigue wear can be caused by mechanical alternating stress, such as a metal on another metal surface repeated sliding or flow caused by the alternating load; can also be between the contact between the temperature cycle due to temperature cycle stress generated by the material Fatigue wear, such as rolling mill parts (such as bearing gears, etc.) subjected to cyclic loads, and wear caused by mechanical alternating stress directly subjected to periodic loads are fatigue wear. Rolling of the roll due to the temperature cycle stress cracking or thermal cracking of the destructive thermal fatigue wear.
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