Journal of the Japan Society for Technology of Plasticity
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
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Evaluation of Strain Distribution of Sheet Formed Parts Using High-Frequency Ultrasonic Waves
Koji KANNOSouichiro NISHINO
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2019 Volume 60 Issue 706 Pages 321-326

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Abstract

We studied a method of evaluating the strain distribution of a steel sheet after tensile forming using high-frequency ultrasonic wave. The longitudinal wave sound velocity after tensile forming, for eight different steel sheets with tensile strengths of 270 MPa to 980 MPa, increased in all samples. Furthermore it was also possible to evaluate strain distributions in press-molded parts formed by draw forming, one-step form forming, and two-step form forming. We found that the measurement results of ultrasonic waves correspond to the residual stress and FWHM in XRD measurements.

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© 2019 The Japan Society for Technology of Plasticity
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