Abstract
Aluminum alloy AA7075 sheets were deformed at room temperature at strain-rates exceeding 1000 /s using the electrohydraulic forming (EHF) technique. A method that combines high speed imaging and digital image correlation technique, developed at Pacific Northwest National Laboratory, was used to investigate high strain rate deformation behavior of AA7075. For strain-rate sensitive materials, the ability to accurately model their high-rate deformation behavior is dependent upon the ability to accurately quantify the strain-rate that the material is subjected to. This work investigates the objectivity of software-calculated strain and strain rate by varying different parameters within commonly used commercially available digital image correlation software. The results show that except for very close to the time of crack opening the calculated strain and strain rates are consistent and independent of the adjustable parameters of the software.
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Aashish Rohatgi, Ayoub Soulami, Elizabeth V. Stephens, Richard W. Davies, and Mark T. Smith, 2014, “An investigation of enhanced formability in AA5182-O Al during high-rate free-forming at room-temperature: Quantification of deformation history,” Journal of Materials Processing Technology, 214(3), pp. 722–732.
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Upadhyay, P., Rohatgi, A., Stephens, E.V., Davies, R.W., Catalini, D. (2015). High-Rate Formability of High-Strength Aluminum Alloys: A Study on Objectivity of Measured Strain and Strain Rate. In: Hyland, M. (eds) Light Metals 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48248-4_55
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DOI: https://doi.org/10.1007/978-3-319-48248-4_55
Publisher Name: Springer, Cham
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