Strain rate sensitivity of low carbon threaded steel rods of grade 4.6 : by Jovan Trajkovski and Robert Kunc

Trajkovski, Jovan (author), Kunc, Robert (author)

Bolt connections are widely used in construction and engineering to securely join structural elements. These connections are essential for distributing loads across components and ensuring that structures can withstand external forces. The planned failure of these bolts is of great importance in steel safety barriers (SSBs), as it can directly influence the height of the guardrail and the working width of the SSB during the vehicle impact, which consequently affects the crash consequences. Therefore, it is of great importance to determine the bolt response until fractures under different strain rates. For that purpose, experimental tensile tests of low-strength steel rods of grade 4.6 were conducted at various strain rates (0.0025–25 s−1) until fracture. Test specimens were photographed during the testing, and by means of image processing, input data for calculation of true stresses and strains up to the point of fracture were extracted. Based on the experimental data, material parameters were determined for the Cowper–Symonds model, enabling precise numerical simulations of these connections at various strain rates. A validation study was also performed successfully.

• Language: English
• Keywords: material characterization, strength parameters, thread failure, numerical simulation, road barriers
• 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: 14 str.
• Numbering: Vol. 17, iss. 24, [art. no.] 6228
• PID: 20.500.12556/RUL-166181
• UDC: 620.1:519.6
• ISSN on article: 1996-1944
• DOI: 10.3390/ma17246228
• COBISS.SI-ID: 220242179
• Publication date in RUL: 23.12.2024

Record is a part of a journal

• Title: Materials
• Shortened title: Materials
• Publisher: Molecular Diversity Preservation International
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

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.

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0109
• Name: Modeliranje v tehniki in medicini