Fatigue limit refers to the ability of metal materials and parts in industrial cabinet lock to resist fatigue failure. Fatigue curve, also known as Weiler curve, usually has two types: one is from a known number of cycles, which actually changes to a horizontal line. This kind of curve can show the characteristics of many steels tested at non high temperature; the other is the decreasing curve, which can show the characteristics of many alloy steels and other materials in high temperature test, and also can represent the characteristics of all materials in corrosive medium Test characteristics.
Fatigue limit refers to the maximum value of the maximum cyclic stress. Even if the number of cycles is large, the stress will not cause damage in practice. Obviously, this fatigue limit can only be determined for the metal material of communication cabinet lock with horizontal stage of fatigue curve, while the specified (conditional) fatigue limit can only be determined for the material whose fatigue curve is continuously decreasing. In this case, the stress value and the number of cycles (test base number) should be indicated.
In particular, the fatigue strength needs statistical treatment. The fatigue limit refers to the maximum cyclic stress value with a certain probability that fatigue fracture does not occur when a sufficient number of specimens are tested under different stress levels under a given number of cycles (test base number).