Details
| Original language | English |
|---|---|
| Pages (from-to) | 294-302 |
| Number of pages | 9 |
| Journal | Key Engineering Materials |
| Volume | 883 |
| Early online date | 27 Apr 2021 |
| Publication status | Published - 2021 |
| Event | 19th International Conference on Sheet Metal, SheMet 2021 - Virtual, Online Duration: 29 Mar 2021 → 31 Mar 2021 |
Abstract
Advanced High Strength Steels (AHSS) are widely used in today's automotive structures for lightweight design purposes. FE simulation is commonly used for the design of forming processes in automotive industry. Therefore, besides the description of the plastic flow behaviour, also the definition of forming limits in order to efficiently exploit the forming potential of a material is required. AHSS are prone for crack appearances without prior indication by thinning, like exemplary shear fracture on tight radii and edge-fracture, which can not be predicted by conventional Forming Limit Curve (FLC). Stress based damage models are able to do this. However, the parameterisation of such models has not yet been standardised. In this study a butterfly specimen geometry, which was developed at the Institute for Forming Technology and Machines (IFUM), was used for a stress state dependent fracture characterisation. The fracture behaviour of two AHSS, CP800 and DP1000, at varied stress states between pure shear and uniaxial loading was characterised by an experimental-numerical approach. For variation of the stress state, the specimen orientation relative to the force direction of the uniaxial testing machine was orientated at different angles. In this way, the relevant displacement until fracture initiation was determined experimentally. Subsequently, the experimental tests have been numerically reproduced giving information about the strain and stress evolution in the crack impact area of the specimen for the experimentally identified fracture initiation. With the help of this testing procedure, two different stress-based damage models, Modified Mohr-Coulomb (MMC) and CrachFEM, were parameterised and compared.
Keywords
- AHSS, Butterfly-Tests, CP800, Damage Modelling, DP1000, Forming Limit, Fracture Characterisation
ASJC Scopus subject areas
- Materials Science(all)
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Key Engineering Materials, Vol. 883, 2021, p. 294-302.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Fracture Characterisation by Butterfly-Tests and Damage Modelling of Advanced High Strength Steels
AU - Behrens, Bernd Arno
AU - Brunotte, Kai
AU - Wester, Hendrik
AU - Dykiert, Matthäus
N1 - Funding Information: The authors are much obliged to the DFG (Deutsche Forschungsgemeinschaft, German Research Foundation) for the financial support of project 405334714. Furthermore, the authors would like to thank voestalpine Stahl GmbH for the provision of the materials under investigation.
PY - 2021
Y1 - 2021
N2 - Advanced High Strength Steels (AHSS) are widely used in today's automotive structures for lightweight design purposes. FE simulation is commonly used for the design of forming processes in automotive industry. Therefore, besides the description of the plastic flow behaviour, also the definition of forming limits in order to efficiently exploit the forming potential of a material is required. AHSS are prone for crack appearances without prior indication by thinning, like exemplary shear fracture on tight radii and edge-fracture, which can not be predicted by conventional Forming Limit Curve (FLC). Stress based damage models are able to do this. However, the parameterisation of such models has not yet been standardised. In this study a butterfly specimen geometry, which was developed at the Institute for Forming Technology and Machines (IFUM), was used for a stress state dependent fracture characterisation. The fracture behaviour of two AHSS, CP800 and DP1000, at varied stress states between pure shear and uniaxial loading was characterised by an experimental-numerical approach. For variation of the stress state, the specimen orientation relative to the force direction of the uniaxial testing machine was orientated at different angles. In this way, the relevant displacement until fracture initiation was determined experimentally. Subsequently, the experimental tests have been numerically reproduced giving information about the strain and stress evolution in the crack impact area of the specimen for the experimentally identified fracture initiation. With the help of this testing procedure, two different stress-based damage models, Modified Mohr-Coulomb (MMC) and CrachFEM, were parameterised and compared.
AB - Advanced High Strength Steels (AHSS) are widely used in today's automotive structures for lightweight design purposes. FE simulation is commonly used for the design of forming processes in automotive industry. Therefore, besides the description of the plastic flow behaviour, also the definition of forming limits in order to efficiently exploit the forming potential of a material is required. AHSS are prone for crack appearances without prior indication by thinning, like exemplary shear fracture on tight radii and edge-fracture, which can not be predicted by conventional Forming Limit Curve (FLC). Stress based damage models are able to do this. However, the parameterisation of such models has not yet been standardised. In this study a butterfly specimen geometry, which was developed at the Institute for Forming Technology and Machines (IFUM), was used for a stress state dependent fracture characterisation. The fracture behaviour of two AHSS, CP800 and DP1000, at varied stress states between pure shear and uniaxial loading was characterised by an experimental-numerical approach. For variation of the stress state, the specimen orientation relative to the force direction of the uniaxial testing machine was orientated at different angles. In this way, the relevant displacement until fracture initiation was determined experimentally. Subsequently, the experimental tests have been numerically reproduced giving information about the strain and stress evolution in the crack impact area of the specimen for the experimentally identified fracture initiation. With the help of this testing procedure, two different stress-based damage models, Modified Mohr-Coulomb (MMC) and CrachFEM, were parameterised and compared.
KW - AHSS
KW - Butterfly-Tests
KW - CP800
KW - Damage Modelling
KW - DP1000
KW - Forming Limit
KW - Fracture Characterisation
UR - http://www.scopus.com/inward/record.url?scp=85120032909&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.883.294
DO - 10.4028/www.scientific.net/KEM.883.294
M3 - Conference article
AN - SCOPUS:85120032909
VL - 883
SP - 294
EP - 302
JO - Key Engineering Materials
JF - Key Engineering Materials
SN - 1013-9826
T2 - 19th International Conference on Sheet Metal, SheMet 2021
Y2 - 29 March 2021 through 31 March 2021
ER -