Integrating Numerical and experimental analyses for the realization of pre-detection of delayed fractures on punched surfaces of ultra-high-strength steel sheets

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Integrating Numerical and experimental analyses for the realization of pre-detection of delayed fractures on punched surfaces of ultra-high-strength steel sheets

UEDA Yuya, EGUCHI Jin, MATSUNO Takashi

Abstract. A key challenge encountered in finite element (FE) punching simulations is accurately capturing the arrest or delay in crack propagation during punch penetration. Conventional methods relying on element deletion demonstrate inadequacies in representing crack arrest, particularly complicating the simulation of the punched surface states in scenarios with minute clearances. This study introduces a novel approach for fracture representation in FE punching simulations, wherein cracks were integrated as perimeter lines during the remeshing process. Utilizing observation-driven crack propagation paths and arrest behaviors, we analyzed the residual stress on punched surfaces under minimal clearance conditions. Results indicate that for 22MnB5 hot-stamped steel, the residual stresses within the interior side of the burnished region can exceed 1 GPa in cases with a 10-μm clearance.

Keywords
Punching, Finite Element Simulation, Residual Stress

Published online 9/15/2024, 9 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: UEDA Yuya, EGUCHI Jin, MATSUNO Takashi, Integrating Numerical and experimental analyses for the realization of pre-detection of delayed fractures on punched surfaces of ultra-high-strength steel sheets, Materials Research Proceedings, Vol. 44, pp 597-605, 2024

DOI: https://doi.org/10.21741/9781644903254-64

The article was published as article 64 of the book Metal Forming 2024

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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