Fatigue-life behaviour and a lifetime assessment of a double-leaf spring using FEM-based software = Utrujanje in ocena dobe trajanja dvolistnatih vzmeti z uporabo MKE-orodja
Borković, Predrag ...
A lifetime assessment of any component by performing classical fatigue tests on real geometry is a very expensive and time-consuming task. For this reason, many efforts have been made to produce a ...computer software which will be able to replace this conventional fatigue testing. Although there is some dissimilarity between these two testing methods, we are free to use such a computer tool to shorten the testing time. The Finite Element Method (FEM) is one of the most frequently used methods for component designing, as well as for fatigue assessment. This assessment includes the stresses, the loads and the strength behavior of the material component. As the input values for the material properties, S/N curves were defined on the basis of the test results. The tensile and fatigue tests on the notched, as well as on the unnotched specimens under compression-tension loading were carried out in order to obtain the static and dynamic (S/N curves) properties of the investigated spring steel (51CrV4). Two groups of specimens were prepared: the longitudinal and perpendicular specimens relative to the rolling direction, both with two different heat-treatments (tempering temperatures). The results of the performed investigation showed a clear difference between the fatigue strengths of the specimens with two outmost segregation orientations and two different tempering temperatures. In addition, other influences, such as the residual stresses due to shoot peening and machining, surface roughness and metallurgical variables, can affect the fatigue strength of a material. All these effects can be taken into account by using the FEM-based simulations.
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