| 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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Soyarslan, Celal
University of Twente
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2024Additive manufacturing of NiTi architected metamaterialscitations
- 2023Functional performance of NiTi shape memory architected structures produced by laser powder bed fusion (LPBF)
- 2023Asymptotic homogenization in the determination of effective intrinsic magnetic properties of compositescitations
- 2022Asymptotic Homogenization in the Determination of Effective Intrinsic Magnetic Properties of Composites
- 2022Periodic Homogenization in Crystal Plasticity
- 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
- 2017Implementation and application of a gradient enhanced crystal plasticity modelcitations
- 2017Effect of surface elasticity on the elastic response of nanoporous gold
- 2016Structure-property relationships in nanoporous metallic glassescitations
- 2015Modeling of fracture in small punch tests for small- and large-scale yielding conditions at various temperatures
- 2015Elastic and plastic poisson’s ratios of nanoporous gold
- 2015Materials based design of structures: computational modeling of the mechanical behavior of gold-polymer nanocomposites
- 2014Finite element methodcitations
- 2014Formability assessment of advanced high strength steel sheets using (an)isotropic Lemaitre’s damage model
- 2014Inherent and induced anisotropic finite visco-plasticity with applications to the forming of DC06 sheetscitations
- 2014On the distortion of yield surface under complex loading paths in sheet metal forming
- 2013Anwendung der expliziten FEM in der Umformtechnik
- 2013Inverse identification of CDM model parameters for DP1000 steel sheets using a hybrid experimental-numerical methodology spanning various stress triaxiality ratioscitations
- 2011Analysis of formability of advanced high strength steel sheets with phenomenologically based failure criteria with separate treatment of instability, shear and normal fracture
- 2008Application of continuum damage mechanics in discontinuous crack formationcitations
Places of action
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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.