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Investigation of the fatigue behavior of open cell foams by a micromechanical 3-D model

: Demiray, S.; Becker, W.; Hohe, J.


Materials Science and Engineering, A. Structural materials, properties, microstructure and processing 504 (2009), No.1-2, pp.141-149
ISSN: 0921-5093
ISSN: 1873-4936
Journal Article
Fraunhofer IWM ()
fatigue; metal foam; homogenization; modelling

This work is concerned with an analysis of fatigue damage accumulation and failure of open cell metal foams. For an efficient numerical analysis, a failure event based simulation procedure is proposed, which considers the failure of individual struts as particular discrete failure events governing the degradation of the foam microstructure during cyclic loading. In a simplifying approach the cyclic stress-strain-response between the discrete failure events is assumed to be independent of time. In conjunction with Miner's rule for the description of the fatigue damage accumulation within the individual struts a numerically efficient computational scheme is obtained, requiring the simulation of only a limited number of cycles. The microscopic results are transferred to the macroscopic level by means of a strain energy based homogenization procedure. In a number of parametric studies on the fatigue behavior of Kelvin foams and a comparison with experimental data, the proposed computational scheme proves to be both accurate and numerically efficient.