Modeling stress upturn at high strain rates for ductile materials
Retired from RAFAEL,
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Published online: 7 September 2018
Ductile materials (mainly metals) exhibit a sharp upturn of stress at strain rates around 103 to 104/s, which is not specific to a certain type of material. It is important to consider stress high rate upturn when dealing with high rate loading, such as shock loading and unloading. Using classical strength models, usually calibrated at not so high rates, may lead to errors with high rate loading and not so high pressures. Here we model high rate upturn on the macroscale. We assume that the upturn mechanism is also responsible for the 4th power law mechanism put forward by Swegle and Grady. In the past we calibrated our overstress dynamic viscoplasticity model for aluminium from 4th power law data. Here we use this calibration to predict the high rate stress upturn.
© The Authors, published by EDP Sciences, 2018
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