Through-thickness work hardening variation in thick high strength steel plates : a novel inverse characterization method

Denys, Kristof (author), Vancraeynest, Niels (author), Cooreman, Steven (author), Rossi, Marco (author), Coppieters, Sam (author)

Due to the production process, thick high strength steel plates potentially exhibit inhomogeneous plastic material behavior through the thickness. For example, the initial yield stress and work hardening behavior might vary through the plate thickness. In order to establish a reliable plasticity model that can be used in finite element simulations to optimize forming processes or to investigate the structural integrity of large structures, this material behavior needs to be characterized. A straightforward characterization method consists of slicing the thick high strength steel plate and conducting standard tensile tests. However, this approach comes with a large experimental effort. A novel specimen is proposed enabling to inversely identify the work hardening behavior at distinct locations through the thickness of a thick steel plate. To this end, a tensile specimen with circular pockets at different depths is used. The strain fields within the pockets are captured using digital image correlation (DIC). finite element model updating (FEMU) is used to inversely identify a predefined strain hardening law for each pocket. First, the procedure is optimized and numerically verified using virtual experiments generated by a finite element model with a known variation of the work hardening behavior. Finally, the procedure is experimentally validated by characterizing the strain hardening behavior of a 10 mm thick S690QL grade.

• Language: English
• Keywords: through thickness strain hardening, FEMU, Nelder-Mead, stereo-DIC, S690QL, thick high strength steel
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: Str. 417-425
• Numbering: Vol. 70, no. 9/10
• PID: 20.500.12556/RUL-163901
• UDC: 620.1:669.1
• ISSN on article: 0039-2480
• DOI: 10.5545/sv-jme.2024.1037
• COBISS.SI-ID: 211347203
• Publication date in RUL: 14.10.2024

Record is a part of a journal

• Title: Strojniški vestnik
• Shortened title: Stroj. vestn.
• Publisher: Zveza strojnih inženirjev in tehnikov Slovenije [etc.], = Association of Mechanical Engineers and Technicians of Slovenia [etc.
• ISSN: 0039-2480
• COBISS.SI-ID: 762116

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Title: Variabilnost preoblikovalnega utrjanja po globini pri debelih ploščah iz jekla visoke trdnosti: nova metoda inverzne karakterizacije
• Keywords: preoblikovalno utrjanje po globini, FEMU, Nelder-Mead, stereo DIC, S690QL, debelo jeklo visoke trdnosti