Deriving a continuous fatigue life curve from LCF to VHCF

Paper #:
  • 2017-01-0330

  • 2017-03-28
Fatigue testing is known as time consuming and therefore it should be a target of fatigue research to accelerate the derivation of fatigue properties. Due to the claimed properties strain or load controlled fatigue tests have to be performed. Carrying out load controlled fatigue tests is necessary to derive the influence of mean stresses and notches on the fatigue strength and life of different materials and joining technologies. In case of material samples increasing test frequencies could be a proper way to accelerate the fatigue testing as long as the increased test frequencies have no influence on the resulting fatigue life. In case of strain controlled fatigue tests it is not possible to increase the test frequencies in order to accelerate the fatigue tests. Therefore the Incremental Step Test allows deriving the cyclic stress-strain-curve with only one test run. Due to the cyclic material behavior of aluminum alloys, which leads to an on-going discussion of the course of the strain life curve over the last years, it is not possible to use the Incremental Step Test and approaches basing on its results to estimate the strain life curve on the contrary to sheet steel alloys. In order to derive a fatigue life curve from the Low Cycle Fatigue (LCF) regime over the High Cycle Fatigue (HCF) regime up to the Very High Cycle Fatigue (VHCF) regime a combined method using strain- and load- controlled fatigue tests will be discussed. This continuous fatigue life curve for aluminum wrought alloys based on the evolution of the elastic-plastic material behavior as well as on the results of high frequency testing up to the VHCF regime will be presented.
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