Fatigue crack crack growth rate fatigue crack growth sheet material slow crack growth these keywords were added by machine and not by the authors.
References material properties sheet metal fatigue.
Failure of metal or components occurs for reasons like irregularities in loading defects in the material inadequacies in design deficiencies in maintenance deficiencies in construction and due to environmental conditions.
Fatigue test of aluminum sample fatigue strength or fatigue limit expresses a material s ability to withstand cyclic stresses.
Total materia extended range includes the largest database of fatigue data and cyclic properties for thousands of metal alloys heat treatments and loading conditions.
The curve which is fitted through these clusters known as an s n diagram stress vs.
Both strain life and stress life parameters are given with monotonic properties added for the reference and statistical.
Fatigue can be defined as progressive localized damage due to fluctuating stress and strains on materials.
This leads to its use in aircraft fuel oil lines fuel tanks other transportation areas sheet metal work appliances and lighting wire and rivets.
The provided values tend toward the conservative end of the spectrum and could be used as baseline design values for preliminary design.
In case of ferrous alloys there is a clear limit the metal can resist.
It is very important to know how to investigate the failure of metal in order to be able to identify the reason for the failure.
As a rough guide the fatigue limit is usually about 40 of the tensile strength.
Some materials notably low carbon steels exhibit a flattening off at a particular stress level as at a in figure 1 which is referred to as the fatigue limit.
The tables below provide properties of common engineering materials.
T 2n y 2n0 f mean stress cr0 effects may be.
Number represents the statistical behavior of the fatigue properties of that specific material at that specific strength level.
Fatigue has traditionally been associated with the failure of metal components which led to the term metal fatigue.
The material property data provided are intended to be representative of the material described.
Strain controlled fatigue properties the smooth specimen fatigue be havior of a metal tested under reversed strain control may be characterized by four material parameters 26 28 which relate the strain amplitude ea to the failure life 2nr see table 1.
In the nineteenth century the sudden failing of metal railway axles was thought to be caused by the metal crystallising because of the brittle appearance of the fracture surface but this has since been disproved.
In case the stress is lower than the limit according to the number of cycles there is no fear of breaking.
The red points in the chart represent the cyclic stress for each test and the number of cycles at which the specimen broke.
