Inhaltszusammenfassung

Hardness testing is traditionally used to determine material properties on a local basis by punching an indenter of a given geometric shape and material into a structural material with a prepared surface to be evaluated. Along this process the force and the indentation depth as well as the shape of the indentation in case a plastic deformation occurs is measured. The basic idea is that such indentations can be performed at the same location on a repetitive basis. Under these conditions the el...Hardness testing is traditionally used to determine material properties on a local basis by punching an indenter of a given geometric shape and material into a structural material with a prepared surface to be evaluated. Along this process the force and the indentation depth as well as the shape of the indentation in case a plastic deformation occurs is measured. The basic idea is that such indentations can be performed at the same location on a repetitive basis. Under these conditions the elasto-plastic area of the indentation theoretically can be fatigued, as it is repeatedly pushed back by the pure elastic area underneath. This process can be analyzed in terms of an intercycle difference in indentation depth or force response. If a correlation between conventional material fatigue properties and the parameters determined through the hardness indentation test could be determined, then an excellent means would be found allowing local fatigue properties to be determined on a near to non-destructive basis and this virtually at any location and on any type of shaped component. Within the paper to be presented the background of the approach will be explained and some initial experimental results will be provided, that could potentially be used to perform the localized assessment of the fatigue properties of structural components of virtually any shape. The approach could become an important method for assessing an ageing aircraft's scatter in material's fatigue properties as well as residual fatigue life estimation, with a result being possibly much more economically viable when compared to a traditional approach.» weiterlesen» einklappen

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DDC Sachgruppe:
Ingenieurwissenschaften