Experimental evaluation of hole expansion ratio in DP600 steel sheet using a displacement controlled stopping criterion
Pablo Souza Pontes, Karine Nascimento Seixas, Rafael Oliveira Santos
Abstract
This study presents the development and validation of an experimental procedure for determining the hole expansion ratio in DP600 steel sheets. The proposed method introduces a fracture criterion based on the observation of a single edge crack, characterized by one through-thickness fracture. The procedure was structured as a step-by-step algorithm inspired by numerical search strategies. The experimental application of the methodology led to the identification of a critical punch displacement of 9.52 mm, at which all tested samples exhibited exactly one complete fracture. The resulting hole expansion ratio values showed an average of 32.4% ± 0.2%, demonstrating good repeatability. The proposed method provides a precise and reproducible alternative for evaluating the formability and edge flangeability of sheared edges in hole expansion tests without automatic fracture detection systems
Keywords
Referências
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Submetido em:
14/10/2025
Aceito em:
24/11/2025
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