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Analysis of the Frequency as an Integral Method for the Testing of Anisotropic 3D Sheet Metal Structure

Abstract The literature review showed that honeycomb-structured fine sheet metals were not adequately investigated regarding their fatigue strength. Moreover, some development in experimental methods for fatigue strength of structured specimens will be necessary. Honeycomb-structured fine sheet metals of the deep-drawing steel DC04 with a thickness of 0.5 mm were examined. Three specimen types were prepared and tested for their fatigue strength. The fatigue tests were performed on a resonant testing machine. Analysis of the resonant frequency was used to clarify the issues of stability and degradation mechanism of the structured sheet metals. A method for characterization of honeycomb-structured sheet metals under cyclic load was developed. Adopted clamping plates were constructed and used for the experiments. The fatigue strength of honeycomb-structured sheet metals was determined. The reasons for low fatigue limit of structured sheet metals were exposed and suggestions for improvement were presented.