engleski

Strain-life behavior of different groups of metallic materials

In proposed paper, strain-life behavior i.e. Δε/2 - 2Nf relationships of main groups of metallic materials (non-alloy steels, low alloy steels, high alloy steels, aluminum and titanium alloys) were analyzed across low-cycle, medium-cycle and highcycle fatigue range. Substantial differences were found to exist among strain-life behaviors of materials belonging to different material groups. This turned out to be in contrast with the fact that most of the existing methods for the estimation of strain-life fatigue parameters from monotonic properties use few expressions and show limited regard as to which group material in question belongs to. It can be concluded that differential approach is required and should be used in developing expressions for estimation of strain-life fatigue parameters. It is expected that individual expressions developed in such a manner will result in more accurate fatigue parameter estimations and hence, more accurate calculations of time to crack initiation both in uniaxial and multiaxial fatigue conditions.

Fatigue parameters; Strain-life behaviour; Metalic materials

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