Load Sequence Effects in Structural Durability
Cancelled
Event details
| Date | 14.11.2014 |
| Hour | 12:15 › 13:15 |
| Speaker | Prof. Dr Michael Vormwald, Technische Universität Darmstadt, Allemagne |
| Location | |
| Category | Conferences - Seminars |
Assessment of variable amplitude fatigue lives requires the application of a damage accumulation rule. The linear damage accumulation rule is widely used. Due to the summation rule for the relative consumed fatigue life its basic property is that the sequence of occurrence of the various cycles does not influence the calculation results. It is well known that the linear damage accumulation rule has deficiencies. They are related to the fact that in the physical fatigue damage accumulation the sequence of the occurrence of individual cycles indeed plays an important role. The material and the structure, respectively, have the ability to store information on prior loading histories. The damage – when measured in physical quantities, e.g. crack lengths, rather than sums of relative consumed fatigue life – of an individual cycle may be larger or smaller in variable amplitude fatigue compared to the constant amplitude case. In an attempt to rationalize the physical basis of sequence effects a classification of physical phenomena was undertaken. Two main groups of information storage possibilities have been identified: material’s plastic deformation and irreversible material separation processes leading to a changing geometry of the structure.
Bio : In 1983, Professor Vormwald received a diploma of the Technische Universität of Darmstadt (TUD) in civil engineering. He earned his doctorate in 1988 at the TUD to the doctor of engineering with a thesis on crack initiation life prediction for variable amplitude loading. He then worked until 1993 as a test engineer and project manager at the Industrieanlagen-Betriebsgesellschaft, Ottobrunn, where he gained practical experience in the durability design of mechanical engineering structures. He continued his scientific career with appointments as a professor at the University of applied science Jena, the Bauhaus University Weimar and until today at the TUD. His research work is focused on all aspects of deformation and failure processes with a special attention on the fatigue strength. The developed methods of evaluating strength have the aim to increase the safety of technical equipment. They should be understood and applied by engineers. He published over 70 articles, wrote well over 100 technical reports on strength investigations and his the co-author of several books among which : Advanced methods of fatigue assessment, with Dieter Radaj.
Bio : In 1983, Professor Vormwald received a diploma of the Technische Universität of Darmstadt (TUD) in civil engineering. He earned his doctorate in 1988 at the TUD to the doctor of engineering with a thesis on crack initiation life prediction for variable amplitude loading. He then worked until 1993 as a test engineer and project manager at the Industrieanlagen-Betriebsgesellschaft, Ottobrunn, where he gained practical experience in the durability design of mechanical engineering structures. He continued his scientific career with appointments as a professor at the University of applied science Jena, the Bauhaus University Weimar and until today at the TUD. His research work is focused on all aspects of deformation and failure processes with a special attention on the fatigue strength. The developed methods of evaluating strength have the aim to increase the safety of technical equipment. They should be understood and applied by engineers. He published over 70 articles, wrote well over 100 technical reports on strength investigations and his the co-author of several books among which : Advanced methods of fatigue assessment, with Dieter Radaj.
Practical information
- General public
- Free
Organizer
- Prof. Dr Alain Nussbaumer
Contact
- Prof. Dr Nicolas Geroliminis & Katrin Beyer