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Size Effect on the Post-Necking Behaviour of Dual-Phase 800 Steel: Modelling and Experiment
,
Shahin Mehraban,
Steve Brown,
Nicholas Lavery
Materials, Volume: 16, Issue: 4, Start page: 1458
Swansea University Authors:
Will Harrison , Shahin Mehraban, Steve Brown, Nicholas Lavery
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DOI (Published version): 10.3390/ma16041458
Abstract
This work investigated the feasibility of using a miniaturised non-standard tensile specimen to predict the post-necking behaviour of the materials manufactured via a rapid alloy prototyping (RAP) approach. The experimental work focused on the determination of the Lankford coefficients (r-value) of...
| Published in: | Materials |
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| ISSN: | 1996-1944 |
| Published: |
MDPI AG
2023
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa66155 |
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| Abstract: |
This work investigated the feasibility of using a miniaturised non-standard tensile specimen to predict the post-necking behaviour of the materials manufactured via a rapid alloy prototyping (RAP) approach. The experimental work focused on the determination of the Lankford coefficients (r-value) of dual-phase 800 (DP800) steel and the digital image correlation (DIC) for some cases, which were used to help calibrate the damage model parameters of DP800 steel. The three-dimensional numerical simulations focused on the influence of the size effect (aspect ratio, AR) on the post-necking behaviour, such as the strain/stress/triaxiality evolutions, fracture angles, and necking mode transitions. The modelling showed that although a good correlation can be found between the predicted and experimentally observed ultimate tensile strength (UTS) and total elongation. The standard tensile specimen with a gauge length of 80 mm exhibited a fracture angle of ∼55°, whereas the smaller miniaturised non-standard specimens with low ARs exhibited fractures perpendicular to the loading direction. This shows that care must be taken when comparing the post-necking behaviour of small-scale tensile tests, such as those completed as a part of a RAP approach, to the post-necking behaviours of standard full-size test specimens. However, the modelling work showed that this behaviour is well represented, demonstrating a transition between the fracture angles of the samples between 2.5 and 5. This provides more confidence in understanding the post-necking behaviour of small-scale tensile tests. |
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| Keywords: |
dual-phase steel; aspect ratio; necking modes; fracture angle; rapid alloy prototyping |
| College: |
Faculty of Science and Engineering |
| Funders: |
Rapid Alloy Prototyping Prosperity Partnership project (EP/S005218/1—ACCELERATING ALLOY DEVELOPMENT THROUGH DELIVERING NOVEL PROTOTYPING SOLUTIONS). |
| Issue: |
4 |
| Start Page: |
1458 |