Failure Hypotheses II

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Failure hypotheses for predicting the fatigue life of composite plain bearings – Extension of the methodology to account for the microstructural effect



Current standards permit interpretation of plain bearings with respect to fatigue strength only to a limited extent. The first phase of this project tested failure hypotheses with respect to their suitability to predict tolerable fatigue limits for loads. The experimental validation studies demonstrated that the fatigue strength of the observed white metals is dependent on the microstructure of the material. Failure hypotheses cannot yet take account of this influence.


Research objectives

Determination of the microstructure's exerting influences on the fatigue strength in sliding layers and identification of more favorable characteristics to improve them. The results are to flow into development of a methodology to take account of these microstructure influences in the interpretation of fatigue strength.

  • Determination of the influence of microstructure characteristics on sliding layer capacity
  • Methods to account for microstructure characteristics within load calculation
  • Identification of more favorable microstructure characteristics for the fatigue strength in sliding layers
  • Transfer of the results into a methodology for interpreting fatigue strength in light of the microstructure influence

Research and project partners

  • Institute for Material Applications in Mechanical Engineering at RWTH Aachen University, IWM
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Promoted by

The German Research Foundation, DFG

The Research Association for Combustion Engines

Project sponsor

The German Research Foundation, DFG

The Research Association for Combustion Engines


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