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Prediction of fatigue lifetime of PM-parts

: Kraft, T.; Riedel, H.

Lawcock, R.:
Advances in powder metallurgy & particulate materials 2003. Vol.4: Modeling : Proceedings of the 2003 International Conference on Powder Metallurgy & Particulate Materials sponsored by the Metal Powder Industries Federation, June 8 - 12, Las Vegas, NV
Princeton: Metal Powder Industries Federation, 2003
ISBN: 1-87895-496-2
International Conference on Powder Metallurgy and Particulate Materials (PM2TEC) <2003, Las Vegas/Nev.>
Fraunhofer IWM ()
fatigue lifetime; P/M-material; 3D; fatigue damage evolution

For predicting the fatigue lifetime of a P/M component not only the loading history must be considered, but also the porosity distribution, which can influence the material behavior significantly and which is calculated in the first step of the simulation. A model developed for describing the fatigue damage evolution in fully dense steels was adapted to the special situation in P/M materials. On the basis of elastic-plastic fracture mechanics a damage parameter is developed and the number of cycles to failure is linked to the damage parameter by a power-law relation. This model is applied in the second step of the analysis. To demonstrate the potential of the method, the fatigue lifetime of three parts was simulated, a simple fatigue test specimen, a lever, and a gear wheel. All parts are modeled in 3D.