Estimating the Cowper–Symonds parameters for high-strength steel using DIC combined with integral measures of deviation

Škrlec, Andrej (author), Panić, Branislav (author), Nagode, Marko (author), Klemenc, Jernej (author)

Cowper–Symonds parameters were estimated for the complex-phase high-strength steel with a commercial name of SZBS800. The parameter estimation was based on a series of conventional tensile tests and unconventional high-strain rate experiments. The parameters were estimated using a reverse engineering approach. LS-Dyna was used for numerical simulations, and the material’s response was modelled using a piece-wise linear plasticity model with a visco-plastic formulation of the Cowper–Symonds material model. A multi-criteria cost function was defined and applied to obtain a response function for the parameters p and C. The cost function was modelled with a response surface, and the optimal parameters were estimated using a real-valued genetic algorithm. The main novelty and innovation of this article is the definition of a cost function that measures a deviation between the deformed geometry of the flat plate-like specimens and the results of the numerical simulations. The results are compared to the relevant literature. A critical evaluation of our results and references is another novelty of this article.

• Language: English
• Keywords: Cowper–Symonds model, digital image correlation (DIC), integral measure of deviation, multi-criterion optimisation, 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: 20 str.
• Numbering: Vol. 14, iss. 9, art. 992
• PID: 20.500.12556/RUL-160655
• UDC: 620.17:669.14
• ISSN on article: 2075-4701
• DOI: 10.3390/met14090992
• COBISS.SI-ID: 206038019
• Publication date in RUL: 02.09.2024

Record is a part of a journal

• Title: Metals
• Shortened title: Metals
• Publisher: MDPI AG
• ISSN: 2075-4701
• COBISS.SI-ID: 15976214

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
• Keywords: Cowper–Symonds materialni model, digitalna korelacija slik, integralna mera odstopanja, multi-kriterijska optimizacija, visoko-trdnostno jeklo

Projects

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P2-0182
• Name: Razvojna vrednotenja