1. Ductile fracture predictions in small punch testing of cold-rolled aluminium alloy
- Author
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Josef Zapletal, Jindřich Petruška, František Šebek, Namsu Park, and Petr Kubík
- Subjects
Materials science ,Mechanical Engineering ,Numerical analysis ,0211 other engineering and technologies ,02 engineering and technology ,Numerical models ,Pressure dependent ,Plasticity ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Mechanics of Materials ,visual_art ,Fracture (geology) ,Calibration ,Aluminium alloy ,visual_art.visual_art_medium ,Material constants ,General Materials Science ,Composite material ,021101 geological & geomatics engineering - Abstract
The ductile fracture has been observed in large as well as small scales. Three chosen Lode and pressure dependent phenomenological ductile fracture criteria with cut-offs were calibrated for aluminium alloy EN AW 2024-T351 using an enhanced hybrid experimental–numerical technique. It consisted of calibrating all the material constants of fracture criteria altogether. This enabled ready determination of the cut-off related constant for one of those criteria. Moreover, a non-quadratic Lode dependent plasticity model was coupled with the ductile failure criteria to form the damage plasticity approach in the numerical analysis. The fracture criteria were calibrated using the standard – large – sized specimens including a non-standard upsetting test. The specimens used for the calibration of failure criteria are usually ten times larger than that of a specimen for the small punch test. The transferability of calibrated parameters was tested and fair predictability was observed for all numerical models when applied to small scales. more...
- Published
- 2019
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