Inhaltszusammenfassung

The need to reliably perform a fatigue life assessment is obvious, if we have the ageing infrastructure in view. Concerning steel components, especially bridges with historical importance are of interest – Budapest, New York City or San Francisco are examples of cities with beautiful monuments – the enhanced traffic loads are the main reason to reflect on their applicable loads and residual lifetime nowadays and in the future. In most of the cases we have no or only insufficient data about th...The need to reliably perform a fatigue life assessment is obvious, if we have the ageing infrastructure in view. Concerning steel components, especially bridges with historical importance are of interest – Budapest, New York City or San Francisco are examples of cities with beautiful monuments – the enhanced traffic loads are the main reason to reflect on their applicable loads and residual lifetime nowadays and in the future. In most of the cases we have no or only insufficient data about the material characteristics. A further field of interest is railway infrastructure since also steel components are still in use here, looking back onto a two centuries history. Based on the fact that the use of the physically based life evaluation (PHYBAL) procedure only requires a small number of specimens – in case of a homogeneous material only three – for the estimation of a complete S-N-fatigue curve, this procedure is an excellent approach by taking samples to be used for life cycle management assessment of these objects. This paper provides an introduction into the PHYBAL approach by discussing results obtained by monitoring fatigue tests on austenitic stainless steel samples with electromagnetic NDT such as eddy current impedance measurement by using a GMR (giant magnetic resistor) as a sensor for monitoring electrical resistance and additionally temperature. As meta stabilized austenitic steels are prone for phase transformation to α'-martensite – a ferromagnetic phase-the observation of enhancing magnetism in the gyromagnetic field is of special interest.» weiterlesen» einklappen

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Klassifikation

DDC Sachgruppe:
Ingenieurwissenschaften