A constitutive high cycle fatigue damage model – based on the interaction between microplasticity and local damage*
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Laurent Flacelière
Abstract
This paper presents a new model that accounts, on a local scale, for the coupling between plasticity due to gliding in shear bands and damage occurring when the accumulated plastic strain has reached a threshold value. The irreversible thermodynamics with internal state variables is employed to keep a middle way between extensive description of plastic and damage flow and application of accessibility requirements. Plasticity and damage are governed by their proper complementary rules (yield functions and potentials). At the same time, a coupling occurs between the damage variable and the hardening parameters. A large experimental database relative to the fatigue behavior of a mild steel C36 submitted to different loading modes (tension, torsion, combined proportional tension and torsion) proves the efficiency of such a model. The prediction of Wöhler curves for cyclic complex stress states can be readily done, but the main feature of this approach is to ensure a clear link between mesoscopic parameters like the hardening behavior of individual grains and the subsequent local damage.
Kurzfassung
Der vorliegende Beitrag präsentiert ein neues Modell das auf lokaler Ebene auf die Koppelung zwischen der Plastizität infolge Gleitens in Scherbändern mit der Schädigung abzielt und die auftritt, wenn die akkumulierte plastische Dehnung einen Schwellwert erreicht hat. Es wurde die irreversible Thermodynamik innerer Zustandsvariablen angewendet, um einen Mittelweg zwischen extensiven Beschreibungen der Fließprozesse und der Anwendung von Abschätzkriterien zu wählen. Plastizität und Schädigung werden durch geeignete komplementäre Regeln (Streckfuntionen und -potentiale) bestimmt. Die zur selben Zeit auftretende Koppelung zwischen den Schädigungsvariablen und den Härtewerten wurde ebenfalss berücksichtigt.
References
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© 2006, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- DGZfP-Mitteilungen
- Organschaft
- Fachbeiträge/Technical Contributions
- Normung von Prüfverfahren in der Bauakustik
- Fatigue damage of weld seams with and without postweld treatment under multiaxial loading*
- On ratchetting-based models of Wear and Rolling Contact Fatigue* (RCF)
- A constitutive high cycle fatigue damage model – based on the interaction between microplasticity and local damage*
- A statistical measure of the non-proportionality of stresses – investigations and applications*
- Multiaxial fatigue life and strength criteria for non-proportional loading*
- Predicting fatigue life of welded aluminium joints with combined bending and torsion using energy based criteria*
- Reliability evaluation of NDT techniques for Cu-welds for risk assessment of nuclear waste encapsulation
- Vorschau/Preview
- Vorschau
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- DGZfP-Mitteilungen
- Organschaft
- Fachbeiträge/Technical Contributions
- Normung von Prüfverfahren in der Bauakustik
- Fatigue damage of weld seams with and without postweld treatment under multiaxial loading*
- On ratchetting-based models of Wear and Rolling Contact Fatigue* (RCF)
- A constitutive high cycle fatigue damage model – based on the interaction between microplasticity and local damage*
- A statistical measure of the non-proportionality of stresses – investigations and applications*
- Multiaxial fatigue life and strength criteria for non-proportional loading*
- Predicting fatigue life of welded aluminium joints with combined bending and torsion using energy based criteria*
- Reliability evaluation of NDT techniques for Cu-welds for risk assessment of nuclear waste encapsulation
- Vorschau/Preview
- Vorschau
