Experimental correlation between bending crack evolution and load-drop criterion in tight-radius three-point bending test with GPa-grade steels
- Authors
- Jeong, Kyucheol; Jeong, Yuhyeong; Lee, Jaewook; Chung, Giseok; Kim, Geun-ho; Yoon, Jonghun
- Issue Date
- Sep-2024
- Publisher
- Elsevier Ltd
- Keywords
- Bending failure; Forming limit; Local formability; Plane-strain failure; Three-point-bending test; VDA-238-100
- Citation
- International Journal of Solids and Structures, v.301, pp 1 - 21
- Pages
- 21
- Indexed
- SCIE
SCOPUS
- Journal Title
- International Journal of Solids and Structures
- Volume
- 301
- Start Page
- 1
- End Page
- 21
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/119851
- DOI
- 10.1016/j.ijsolstr.2024.112949
- ISSN
- 0020-7683
1879-2146
- Abstract
- Determining the bending-fracture limit, also referred to as local formability, is crucial for sheet metal forming. However, this is limited by existing methods such as the VDA-238-100 standard due to limitations in its failure criterion based on the punch load. This study addresses this limitation by proposing a quantitative crack-based failure criterion and investigating its relationship to the load-drop point. Along with surface and cross-sectional optical analyses, an integrated line-scanning system for the VDA-238 test is developed, and advanced high-strength steel (AHSS) grades are analysed with yield strengths ranging from 980 to 1500 MPa in both the rolling and transverse directions. The results showed that, while the load-drop point marks a rapid shift in the crack-propagation direction, the true onset of crack initiation occurs earlier, with different patterns for each AHSS and direction. For all the AHSS and directions tested, a crack depth exceeding 1 % of the sheet thickness occurs at 90 % of the switch-off stroke in the VDA-238 test, suggesting an empirical tendency toward microcrack growth for a more accurate evaluation of the local formability based on early cracks. © 2024
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