engleski

New Approach to Evaluation of Formability of Higher-Strength Steel Strips

The paper analyses the material characteristics of deep-drawability of steel sheets with the thickness from 1 to 1, 8 mm, the yield point above 330 MPa and the loading rate up to 150 m/min. The analysis resulted in the finding that with the loading rate up to ca 10 m/min the formability characteristics slightly increase and after exceeding this value these characteristics significantly decrease. In practice, the strain rates are below 1 s– 1, therefore the material characteristics determined using standard tests can be used to determine the limit states up to the above- mentioned rate.

strain rate ; formability ; deep-drawability ; cupping test ; steel sheets

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