ORIGINAL RESEARCH article
Front. Mater.
Sec. Mechanics of Materials
Volume 12 - 2025 | doi: 10.3389/fmats.2025.1692324
Stress Concentration Characteristics and Coefficient Modification for DC04 steel with holes of Finite Thickness
Provisionally accepted
- Beijing Technology and Business University, Beijing, China
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DC04 steel sheets with a finite thickness are the subject of this study. Material mechanical properties were determined through tensile and shear tests, while fracture characteristics along the thickness direction were analyzed. Scanning Electron Microscopy (SEM) observation of fracture surfaces was combined with these tests to clarify the influence of holes on the mechanical behavior of the steel sheet steel, confirming that fracture initiates from microvoids within the material and propagates to the free surfaces. Subsequently, A finite element simulation of the tensile test on steel plates was performed in ABAQUS, with plate thicknesses ranging from 0.3 mm to 1.4 mm and central hole diameters from 2 mm to 6 mm, corresponding to width-to-diameter ratios of 0.2 to 0.6.based on ABAQUS simulation results, the The influence of hole shape on the stress concentration factor (SCF) was quantified. Relationships between sheet thickness, diameter-to-width ratio, and SCF were established. The Levenberg-Marquardt algorithm was employed to modify the stress concentration coefficient for the thin steel sheet steel. The results demonstrate that for a given diameter-to-width ratio, an optimal sheet thickness exists where the SCF stabilizes. An empirical formula for determining this optimal thickness based on a known diameter-to-width ratio was derived. These findings provide a theoretical basis and technical support for the engineering design of perforated DC04 thin steel sheet steel components.
Keywords: DC04 stee1, Finite thickness2, Stress concentration around holes3, Stressconcentration factor4, Plate Thickness5
Received: 25 Aug 2025; Accepted: 14 Oct 2025.
Copyright: © 2025 You, Zhang, Lin, Tang and Du. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: limei Zhang, zhanglimei@btbu.edu.cn
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