Inhaltszusammenfassung

The comprehensive characterization of the change in metallic materials' microstructure due to an applied load is of prime importance for the understanding of basic fatigue mechanisms or more general damage evolution processes. If understood, advanced fatigue life evaluation methods, being far from linear damage accumulation models, can be realized providing even more than only "classic fatigue data". In view of this, different short-time evaluation procedures (STEP) have been developed during...The comprehensive characterization of the change in metallic materials' microstructure due to an applied load is of prime importance for the understanding of basic fatigue mechanisms or more general damage evolution processes. If understood, advanced fatigue life evaluation methods, being far from linear damage accumulation models, can be realized providing even more than only "classic fatigue data". In view of this, different short-time evaluation procedures (STEP) have been developed during the last years at the Chair of Non-Destructive Testing and Quality Assurance at Saarland University, which takes into account that a material's elastic-plastic reaction and hence relationship is non-linear and shows how the potential of non-destructive testing methods, the digitalisation of the measurement techniques as well as signal processing can be combined in order to achieve a significant gain in information concerning the fatigue behaviour with a simultaneous reduction of experimental effort and cost. Beside StressLife and StrainLife, SteBLife is one of these new STEP methods showing a breakthrough of new possibilities in rapid fatigue data provision. With respect to the test strategy of SteBLife, only three to five tests are required to determine a complete S-N-curve including mean and/or complete scatter bands compared to a ten times higher number of tests required when determining this information the "classical" way. If a trend (mean) S-N-curve is required only, then the number of tests may be reduced to a single test. Beside the reduction in time and cost for experimentation, STEP-methods offer the possibility to take more fatigue relevant parameters into account, which opens the scope for a much larger dataset of S-N-curves resulting in multidimensional datasets to be used as input parameters for different structural simulation and assessment tasks.» weiterlesen» einklappen

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DDC Sachgruppe:
Ingenieurwissenschaften