A material works in fatigue when it withstands loads that vary cyclically with time.
The fatigue test is aimed at analyzing the strength characteristics of materials when working under variable loads. Among the fundamental parameters that qualify the characteristic fatigue behavior of materials are:
- The kinetics of the applied load over time.
- Type of voltages generated in the part, as a consequence of the application of the load.
– Type of work characteristic of the part as a whole in the machinery.
The type of work, type of stresses and kinetics of loading determine a wide variety of fatigue tests.
Fatigue tests can be either of finished partssuch as car shock absorbers or other types of shock absorbers, which are intended to see their useful life.
On the other hand, fatigue tests can also be, very commonly, on asphaltsThe aim is to see the deterioration that the asphalt, or bituminous mix, undergoes over time and to see the progressive degradation.
For these tests, there are specific tools, such as the bending at 3 and 4 pointsindirect traction tools (Brazilian trial), for indirect tensile fatigue, or the UGR FACT, designed by the University of Granada.
Some of the rules that apply to this world are the UNE EN 12697-24-2012 in various annexes, and UNE EN 12697-26-2012 in various annexes.
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