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Dive into the research topics where Dirk Mohr is active.

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Featured researches published by Dirk Mohr.


International Journal of Fracture | 2016

Critical hardening rate model for predicting path-dependent ductile fracture

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

Additively-manufactured metallic micro-lattice materials for high specific energy absorption under static and dynamic loading

Thomas Tancogne-Dejean; Adriaan Spierings; Dirk Mohr


International Journal of Plasticity | 2017

Large deformation response of additively-manufactured FCC metamaterials: From octet truss lattices towards continuous shell mesostructures

Colin Bonatti; Dirk Mohr


Acta Materialia | 2017

Micro-tension and micro-shear experiments to characterize stress-state dependent ductile fracture

Maysam Gorji; Dirk Mohr


Mechanics of Materials | 2018

Stress-state and strain-rate dependent ductile fracture of dual and complex phase steel

Borja Erice; Christian Roth; Dirk Mohr


International Journal of Impact Engineering | 2018

Fracture of high-strength armor steel under impact loading

Teresa Fras; Christian Roth; Dirk Mohr


International Journal of Solids and Structures | 2017

Elastically-isotropic truss lattice materials of reduced plastic anisotropy

Thomas Tancogne-Dejean; Dirk Mohr


Engineering Fracture Mechanics | 2017

Combined necking & fracture model to predict ductile failure with shell finite elements

Keunhwan Pack; Dirk Mohr


International Journal of Mechanical Sciences | 2018

Stiffness and specific energy absorption of additively-manufactured metallic BCC metamaterials composed of tapered beams

Thomas Tancogne-Dejean; Dirk Mohr


Extreme Mechanics Letters | 2018

Elastically-isotropic elementary cubic lattices composed of tailored hollow beams

Thomas Tancogne-Dejean; Dirk Mohr

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Thomas Tancogne-Dejean

Massachusetts Institute of Technology

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Keunhwan Pack

Massachusetts Institute of Technology

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Léo Morin

Centre national de la recherche scientifique

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Colin Bonatti

Massachusetts Institute of Technology

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Colin Bonatti

Massachusetts Institute of Technology

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Matthieu Dunand

Massachusetts Institute of Technology

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