Abstract
Plastic Strain Ratio, also called the R value, is a key parameter to evaluate the formability of sheet metal which is widely used in the yield functions and constitutive equations. To measure the R value during a tensile test, the strain along the width direction and thinning direction have to be measured simultaneously. Conventionally, due to the difficulties of measuring the thinning strain, the R value is usually calculated from the principle strain 1 and 2 under zero plastic volume change assumption. This paper shows a novel testing setup using a 3D digital image correlation which can measure the strain in width and thinning strain simultaneously, thus the R value can be measured directly without volume constant assumption. The test plan, experiment setup and results are shown in detail in this article.
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Acknowledgement
The authors would like to express their sincere thanks to Dr. Changqing Du from FCA US LLC, who provided valuable criticisms and suggestions during this research.
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© 2017 The Society for Experimental Mechanics, Inc.
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Xie, X., Li, J., Zhang, B., Sia, B., Yang, L. (2017). Direct Measurement of R Value for Aluminum Alloy Sheet Metal Using Digital Image Correlation. In: Sutton, M., Reu, P. (eds) International Digital Imaging Correlation Society. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-51439-0_22
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DOI: https://doi.org/10.1007/978-3-319-51439-0_22
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Publisher Name: Springer, Cham
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Online ISBN: 978-3-319-51439-0
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