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疲劳断裂是指构件在重复变化载荷作用下引起的断裂。机械构件在反复经受足够大的载荷(常常最大应力低于静力强度极限,且大多低于屈服极限)后,在某些较高应力部位,例如孔、槽、尖角,以至加工刀痕处开始形成疲劳裂缝,然后逐渐伸展直到完全断裂。在所有的实物损坏中,疲劳损坏的比例最高,约占70%左右,疲劳断裂的类型也较复杂,常见的有高周疲劳、低周疲劳、接触疲劳、腐蚀疲劳、热疲劳等。普通典型的宏观疲
Fatigue fracture refers to the member in the repeated changes under the load caused by the fracture. Mechanical components are subject to high stress (such as holes, troughs, sharp corners, and even machining cuts) after being repeatedly subjected to a sufficiently large load (often the maximum stress is below the static strength limit and mostly below the yield point) Begin to form fatigue cracks, and then gradually extended until completely broken. In all physical damage, the highest proportion of fatigue damage, accounting for about 70%, the type of fatigue fracture is also more complex, common high cycle fatigue, low cycle fatigue, contact fatigue, corrosion fatigue, thermal fatigue and so on. Common typical macro fatigue