Abstract
Evaluating the shear edge quality and edge cracking is important in forming the advanced high-strength steel (AHSS) for automotive structural parts. This paper introduces the eddy current-based NDE method to evaluate the sheared edge quality. Different shear clearances from 5 to 25% of the sheet thickness were used to create different work-hardening levels on the sheared edges, which change the local formability. The NDE sensor scanned the sheared DP780 blanks to obtain the NDE data. The micro-hardness at the sheared edge was measured to compare the NDE data to the work-hardening level of the sheared edge. The edge formability was evaluated using the half specimen dome test (HSDT) with digital image correlation (DIC). The measured HSDT failure strain was correlated with the NDE data. The NDE result showed a good correlation with the DIC measured failure strain and micro-hardness. With further development effort, the eddy current-based NDE method can be implemented to inspect the sheared edge quality in a production environment.
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Acknowledgments
The authors acknowledge great support from the Ohio Development Service Agency on Edison Advanced Manufacturing Program (Grant number AMP 17-103-2017) and wonderful collaborations with the industry partners: General Motors Company, Fiat Chrysler Automobiles (FCA), Cosma International, POSCO, Novelis, ESI, AutoForm, Diversified Tooling Group, AMEPA, Fuchs Lubricants Co., Selmatec, and GBTP.
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Gu, J., Pathak, N., Freed, S., Todorov, E., Kim, H. (2021). Application of the Nondestructive Evaluation (NDE) Method to Evaluate the Sheared Edge Quality and Edge Cracking. In: Daehn, G., Cao, J., Kinsey, B., Tekkaya, E., Vivek, A., Yoshida, Y. (eds) Forming the Future. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-75381-8_132
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DOI: https://doi.org/10.1007/978-3-030-75381-8_132
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