Numerical and experimental lifetime prediction for multiaxial loaded air-spring systems

• Applicant: Professor Dr.-Ing. Uwe Weltin
• Subject Area: Mechanics ; Applied Mechanics, Statics and Dynamics ; Materials in Sintering Processes and Generative Manufacturing Processes
• Term: from 2011 to 2018
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 195623579

The aim of this research project is the life time prediction of multiaxial loaded air-spring systems on the basis of a local fatigue and damage concept. Due to the external loads, the implementation of more compact and more powerful systems leads to an increase in the internal pressure in the air-spring bellow. To meet the increased demands of such air-spring systems, an optimization of the strength and the use of materials corresponding to the real, expected loads is required. To date, the individual failure mechanisms in the composite material of the bellow under complex loadings are not sufficiently clarified. This research project focuses in the numerical determination of the local stress and strains under multi-axial loadings based on multi-scale models and the experimental investigation of air-spring systems. In order to validate calculations, specimen tests and component tests shall be carried out. To look at the interface of the cord rubber composites, new specimens have been designed. The results of the tests on these specimens should lead to a better understanding of the failure mechanisms of the composite material. At the end of the research project, tests according to the life time of whole air-spring systems shall be done to validate the developed methods. For the investigations on whole air-spring systems a hexapod test rig funded by the DFG shall be used. The results obtained should be able to be applied generally to air-spring systems and make the development process more efficient.

• DFG Programme: Research Grants