Evaluating material failure of AHSS using acoustic emission analysis

authored by: Eugen Stockburger, Hendrik Vogt, Hendrik Wester, Sven Hübner, Bernd Arno Behrens
Abstract: Driven by high energy prices and strict legal requirements on CO2 emissions, high-strength sheet steel materials are increasingly gaining importance in the automotive industry regarding electric vehicles and their battery range. Simulation-based design of forming processes can contribute to exploiting their high potential for lightweight design. However, previous studies show that numerical simulation with conventional forming limit curves does not always provide adequate prediction quality. Failure models that take the stress state into account represent an alternative prediction method for the shear-dominated failure, that frequently occur in high-strength steels during forming. The failure behaviour of the sheet materials can be determined by different specimen geometries for a wide range of stress states and by using an optical measurement system to record the local strain on the surface of the specimen at the location of failure. However, for many high-strength steels, critical damage or failure initiation already occurs inside the specimen. Therefore, a method is needed that allows detection of failure initiation at an early stage before the crack becomes visible on the surface of the specimen. One possible method is the use of acoustic emission analysis. By coupling it with an imaging technique, the critical strains leading to failure initiation inside the specimen can be determined. In the presented paper, butterfly tests are performed for a wide range of stress states and measured with an optical as well as an acoustical measurement system. The tests are analysed regarding the failure initiation using a mechanical, optical as well as acoustical evaluation method and compared with each other.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Conference contribution
Pages: 379-386
No. of pages: 8
Publication date: 2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Materials Science
Electronic version(s): https://doi.org/10.21741/9781644902417-47 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{101d0b6cc21244faa36f838345600eff,
title = "Evaluating material failure of AHSS using acoustic emission analysis",
abstract = "Driven by high energy prices and strict legal requirements on CO2 emissions, high-strength sheet steel materials are increasingly gaining importance in the automotive industry regarding electric vehicles and their battery range. Simulation-based design of forming processes can contribute to exploiting their high potential for lightweight design. However, previous studies show that numerical simulation with conventional forming limit curves does not always provide adequate prediction quality. Failure models that take the stress state into account represent an alternative prediction method for the shear-dominated failure, that frequently occur in high-strength steels during forming. The failure behaviour of the sheet materials can be determined by different specimen geometries for a wide range of stress states and by using an optical measurement system to record the local strain on the surface of the specimen at the location of failure. However, for many high-strength steels, critical damage or failure initiation already occurs inside the specimen. Therefore, a method is needed that allows detection of failure initiation at an early stage before the crack becomes visible on the surface of the specimen. One possible method is the use of acoustic emission analysis. By coupling it with an imaging technique, the critical strains leading to failure initiation inside the specimen can be determined. In the presented paper, butterfly tests are performed for a wide range of stress states and measured with an optical as well as an acoustical measurement system. The tests are analysed regarding the failure initiation using a mechanical, optical as well as acoustical evaluation method and compared with each other.",
keywords = "Acoustic Emission, Fracture Analysis, High Strength Steel",
author = "Eugen Stockburger and Hendrik Vogt and Hendrik Wester and Sven H{\"u}bner and Behrens, {Bernd Arno}",
note = "Funding Information: The authors gratefully acknowledge the support of the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) within the Project 385276585 {\textquoteleft}{\textquoteleft}Improving the failure characterisation of advanced high-strength steel sheets by coupling measurement systems for optical forming analysis with acoustic emission technology{\textquoteright}{\textquoteright}.; 20th International Conference on Sheet Metal, SHEMET 2023 ; Conference date: 02-04-2023 Through 05-04-2023",
year = "2023",
doi = "10.21741/9781644902417-47",
language = "English",
isbn = "9781644902400",
series = "Materials Research Proceedings",
publisher = "Association of American Publishers",
pages = "379--386",
editor = "Marion Merklein and Hinnerk Hagenah and Duflou, {Joost R.} and Livan Fratini and Fabrizio Micari and Paulo Martins and Gerson Meschut",
booktitle = "Sheet Metal 2023 - 20th International Conference on Sheet Metal",
}