Dirk Mohr
École Polytechnique Fédérale de Lausanne
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Publication
Featured researches published by Dirk Mohr.
International Journal of Fracture | 2016
Stephane J. Marcadet; Dirk Mohr
A new phenomenological framework for predicting ductile fracture after non-proportional loading paths is proposed, implemented into FE software and validated experimentally for a limited set of monotonic and reverse loading conditions. Assuming that ductile fracture initiation is imminent with the formation of a shear band, a shear localization criterion in terms of the elastoplastic tangent matrix is sufficient from a theoretical point of view to predict ductile fracture after proportional and non-proportional loading. As a computationally efficient alternative to analyzing the acoustic tensor, a phenomenological criterion is proposed which expresses the equivalent hardening rate at the onset of fracture as a function of the stress triaxiality and the Lode angle parameter. The mathematical form of the criterion is chosen such that it reduces to the Hosford–Coulomb criterion for proportional loading. The proposed framework implies that the plasticity model is responsible for the effect of loading history on ductile fracture. Important non-isotropic hardening features such as the Bauschinger effect, transient softening and hardening stagnation must be taken into account by the plasticity model formulation to obtain reasonable fracture predictions after non-proportional loading histories. A new comprehensive plasticity model taking the above effects into account is thus an important byproduct of this work. In addition, compression–tension and reverse-shear experiments are performed on specimens extracted from dual-phase steel sheets to validate the proposed plasticity and fracture model.
Acta Materialia | 2016
Thomas Tancogne-Dejean; Adriaan Spierings; Dirk Mohr
International Journal of Plasticity | 2017
Colin Bonatti; Dirk Mohr
Acta Materialia | 2017
Maysam Gorji; Dirk Mohr
Mechanics of Materials | 2018
Borja Erice; Christian Roth; Dirk Mohr
International Journal of Impact Engineering | 2018
Teresa Fras; Christian Roth; Dirk Mohr
International Journal of Solids and Structures | 2017
Thomas Tancogne-Dejean; Dirk Mohr
Engineering Fracture Mechanics | 2017
Keunhwan Pack; Dirk Mohr
International Journal of Mechanical Sciences | 2018
Thomas Tancogne-Dejean; Dirk Mohr
Extreme Mechanics Letters | 2018
Thomas Tancogne-Dejean; Dirk Mohr