Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 42: Topical Session: Fundamentals of Fracture - Continuous Models
MM 42.4: Vortrag
Mittwoch, 13. März 2013, 17:30–17:45, H4
Simulation of damage accumulation in slip bands and their influence on the resonant behavior in the very high cycle fatigue (VHCF) regime — •Philipp-Malte Hilgendorff1, Andrei Grigorescu2, Martina Zimmermann3, Claus-Peter Fritzen1, and Hans-Jürgen Christ2 — 1Institut für Mechanik und Regelungstechnik - Mechatronik, Universität Siegen, Germany — 2Institut für Werkstofftechnik, Universität Siegen, Germany — 3Institut für Werkstoffwissenschaft, Technische Universität Dresden, Germany
The service life of structural components under very high cycle fatigue loading is mainly determined by the period of fatigue crack initiation and thus the localization of plastic deformation. By means of a new approach the characterization of the damage accumulation in the VHCF regime is based on the resonant behavior of the specimen. The resonant behavior of a metastable austenitic stainless steel (AISI304) is studied experimentally in the VHCF regime and shows a distinct transient characteristic. To obtain a physically-based understanding of this characteristic, a microstructural simulation model is proposed which accounts for the damage mechanisms of slip bands. The implementation of the simulation model into a numerical method allows the investigation of the damage accumulation in a simulated microstructure. The numerical method used in this study is the two-dimensional (2-D) boundary element method which is based on two integral equations. Results show that simulation of slip bands is in good agreement to microscopic observations and that plastic deformation in slip bands influences the transient characteristic of the resonant behavior.