| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Bargmann, Swantje
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (32/32 displayed)
- 2022A design method for metamaterials: 3D transversely isotropic lattice structures with tunable auxeticitycitations
- 2022Orientation-dependent micromechanical behavior of nacre: In situ TEM experiments and finite element simulationscitations
- 2021Hierarchical Microstructure of Tooth Enameloid in Two Lamniform Shark Species, Carcharias taurus and Isurus oxyrinchuscitations
- 2020An Enhanced Method to Evaluate Tensile Yield Stress by Small Punch Tests Using Deflection Curves
- 2018Functionalisation of metal-polymer-nanocomposites : chemoelectromechanical coupling and charge carrier transport
- 20183D stochastic bicontinuous microstructures: generation, topology and elasticitycitations
- 2018A class of rate-independent lower-order gradient plasticity theoriescitations
- 2017Size affected dislocation activity in crystals : advanced surface and grain boundary conditions
- 2017Elastic behaviour at the nanoscale of innovative composites of nanoporous gold and polymer
- 2017Effect of surface elasticity on the elastic response of nanoporous gold
- 2017The role of geometrically necessary dislocations in cantilever beam bending experiments of single crystalscitations
- 2016Fourth-order strain-gradient phase mixture model for nanocrystalline fcc materialscitations
- 2016Lurie solution for spherical particle and spring layer model of interphases : its application in analysis of effective properties of composites
- 2016Study of intrinsic and extrinsic size effects on shear bands in metallic glasses
- 2016Structure-property relationships in nanoporous metallic glassescitations
- 2016Automatic three-dimensional geometry and mesh generation of periodic representative volume elements for matrix-inclusion compositescitations
- 2016Interface elasticity effects in polymer-filled nanoporous metals
- 2016Influences of RVE topology, discretization and boundary conditions in practical multiscaling - a comparison
- 2015Modeling of fracture in small punch tests for small- and large-scale yielding conditions at various temperatures
- 2015Characterization of the microstructure evolution in IF-Steel and AA6016 during plane-strain tension and Simple Shearcitations
- 2015Elastic and plastic poisson’s ratios of nanoporous gold
- 2015Finite element damage analysis of an underwater glider–ship collision
- 2015Materials based design of structures: computational modeling of the mechanical behavior of gold-polymer nanocomposites
- 2015The plastic yield and flow behavior in metallic glasses
- 2015The plastic yield and flow behavior in metallic glassescitations
- 2014Application of a gradient crystal plasticity model to numerical analysis of metal part of nanoporous metal - Polymer composites
- 2014Inherent and induced anisotropic finite visco-plasticity with applications to the forming of DC06 sheetscitations
- 2014Property optimization of porous metallic glasses via structural designcitations
- 2013Crashworthiness of magnesium sheet structurescitations
- 2011Phenomenological modeling of anisotropy induced by evolution of the dislocation structure on the macroscopic and microscopic scale
- 2011Phenomenological modeling of anisotropy induced by evolution of the dislocation structure on the macroscopic and microscopic scalecitations
- 2011Modeling of polycrystals using a gradient crystal plasticity theory that includes dissipative microstressescitations
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article
Modeling of fracture in small punch tests for small- and large-scale yielding conditions at various temperatures
Abstract
We present a systematic numerical study on temperature dependent fracture mode change in small punch tests. Following Needleman and Tvergaard (2000), we model the material as thermo-inelastic, where the ductile fracture mode, by void nucleation, growth and coalescence is accounted for by Gurson's porous metal plasticity (Gurson, 1977). The brittle fracture mode by cleavage is accounted for by Ritchie-Knott-Rice's deterministic maximum principal stress criterion (Ritchie et al., 1973). The well-known problem of mesh dependence associated with softening material behavior is remedied by using an integral type nonlocal formulation similar to that presented in Tvergaard and Needleman (1995). Two length scales are incorporated into the constitutive relations: the ductile fracture length scale is based on the average inclusion distance and associated with the nonlocal evolution equation for the porosity. The brittle fracture length scale is based on the average grain size and associated with the material region at which the maximum principal stress is averaged out. The material model is used to simulate small punch tests at -196°C, -158°C and 25°C of notched and unnotched specimens of P91 steel representative for small- and large-scale yielding conditions, respectively. The simulated fracture modes and patterns show a very good agreement with experiments: for -196°C brittle fracture propagating normal to the maximum (tensile) principal stress prevails. For 25°C ductile fracture is governed by shear localization with voidage. The simulations also show that the deformation energy is considerably higher for the upper shelf tests compared to the lower shelf tests.