Fracture modelling of magnesium sheet alloy AZ31 for deep drawing processes at elevated temperatures

authored by: Bernd Arno Behrens, Hendrik Wester, Matthäus Dykiert
Abstract: Today, the reduction of CO2 emissions is essential to meet global climate requirements. In this context, a reduction in vehicle weight is the most efficient way to reduce the fuel consumption of a passenger car. Magnesium combines relatively high strength with low weight and is therefore an interesting construction material for lightweight solutions. In numerical process design, it is essential to be aware of the forming capacity of a material. The common method to describe the failure behaviour is the use of forming limit curve (FLC). Stress-based models offer the advantage of a strain path consideration and an extension in the area of shearing and compression. In this paper a stress-based damage model, Modified Mohr-Coulomb (MMC), was parameterized by IFUM Butterfly-Tests for an AZ31 magnesium sheet alloy under consideration of elevated process temperatures. For this purpose, the tests were carried out at different stress states and temperatures using a specially designed testing device. In addition, forming limit curves were determined by Nakajima tests. Finally, both methods, MMC and FLC, were compared to an experimental deep-drawing test. This comparison showed that the MMC Model achieved significantly better results regarding the fracture prediction in this application case.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Conference article
Journal: Procedia Manufacturing
Volume: 50
Pages: 739-743
No. of pages: 5
ISSN: 2351-9789
Publication date: 04.09.2020
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Industrial and Manufacturing Engineering, Artificial Intelligence
Sustainable Development Goals: SDG 13 - Climate Action
Electronic version(s): https://doi.org/10.1016/j.promfg.2020.08.133 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{16152c74962848989242c2f3a04ba503,
title = "Fracture modelling of magnesium sheet alloy AZ31 for deep drawing processes at elevated temperatures",
abstract = "Today, the reduction of CO2 emissions is essential to meet global climate requirements. In this context, a reduction in vehicle weight is the most efficient way to reduce the fuel consumption of a passenger car. Magnesium combines relatively high strength with low weight and is therefore an interesting construction material for lightweight solutions. In numerical process design, it is essential to be aware of the forming capacity of a material. The common method to describe the failure behaviour is the use of forming limit curve (FLC). Stress-based models offer the advantage of a strain path consideration and an extension in the area of shearing and compression. In this paper a stress-based damage model, Modified Mohr-Coulomb (MMC), was parameterized by IFUM Butterfly-Tests for an AZ31 magnesium sheet alloy under consideration of elevated process temperatures. For this purpose, the tests were carried out at different stress states and temperatures using a specially designed testing device. In addition, forming limit curves were determined by Nakajima tests. Finally, both methods, MMC and FLC, were compared to an experimental deep-drawing test. This comparison showed that the MMC Model achieved significantly better results regarding the fracture prediction in this application case.",
keywords = "Fracture Characterisation, IFUM Butterfly-Tests, Magnesium Sheet AZ31B, Stress-based Fracture Modelling",
author = "Behrens, {Bernd Arno} and Hendrik Wester and Matth{\"a}us Dykiert",
note = "Funding Information: The authors are much obliged to the DFG (Deutsche Forschungsgemeinschaft, eG rman eR search Foundation) for the financial support of project 44192561 “Enhanced FE-simulation of tempered forming processes with the magnesium sheet material AZ31B by an extended modelling of its formability”. ; 18th Metal Forming International Conference, Metal Forming 2020 ; Conference date: 13-09-2020 Through 16-09-2020",
year = "2020",
month = sep,
day = "4",
doi = "10.1016/j.promfg.2020.08.133",
language = "English",
volume = "50",
pages = "739--743",
journal = "Procedia Manufacturing",
issn = "2351-9789",
publisher = "Elsevier BV",
}