Mathematical modeling of the influence parameters during formation and propagation of the Lüders bands

Scientific paper - Original scientific paper

• Author: Tin Brlić
• Author: Stoja Rešković
• Author: Zoran Jurković
• Author: Gordan Janeš
• Author's institution: University of Rijeka; Faculty of Engineering
• Author's institution: University of Zagreb; Faculty of Metallurgy
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract (english)

In this study, an analysis of the influence parameters measured by the static tensile test, thermography and digital image correlation was performed during formation and propagation of the Lüders bands. A new approach to the prediction of stresses, maximum temperature changes and strains during the Lüders band formation and propagation is proposed in this paper. Application of the obtained mathematical models of influence parameters gives a clear insight into the behavior of niobium microalloyed steel at the beginning of the plastic flow, which can improve product quality and reduce costs during the forming of microalloyed steels with the appearance of the Lüders bands. The obtained models of influential parameters during formation and propagation of the Lüders bands have been developed by the regression analysis method. The proposed mathematical models showed low deviations of calculated results ranging from 1.34% to 12.37%.The local stress amounts, important in the forming of microalloyed steels since indicating surface roughness and plastic flow possibilities during the Lüders band propagation, are obtained by the mathematical model. It was found that stress amounts increase during the Lüders band propagation in the area behind the Lüders band front. The difference in stress amount between the start of the Lüders band propagation and advanced Lüders band propagation is 25.53 MPa.

• Keywords (english): Lüders bands, Regression analysis, Microalloyed steel, Thermography, Digital image correlation
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Facta Universitatis, Series: Mechanical Engineering
• Numbering: vol. 18, no. 4, pp. 595-610
• p-ISSN: 0354-2025
• e-ISSN: 2335-0164
• DOI: https://doi.org/10.22190/FUME200416041B
• URN:NBN: urn:nbn:hr:115:456228
• Publication: 2020-12-03
• Document URL: http://casopisi.junis.ni.ac.rs/index.php/FUMechEng/article/view/6347
• Type of resource: Text
• Access conditions: Closed access
• Created on: 2024-05-04 15:27:05