Authors: Guo, X.
Sow, C.
Khalil, C.
Heuzé, T.
Racineux, G.
Title: Material Constitutive Behavior Identification at High Strain Rates Using a Direct-Impact Hopkinson Device
Language (ISO): en
Abstract: Modern numerical simulation techniques allow nowadays obtaining accurate solutions of magnetic pulse and electrohydraulic forming/welding processes. However, one major difficulty persists: the identification of material constitutive equations behavior at levels of high strain rates reached by these processes, and which varies between 103 and 105 s-1. To address this challenge, a direct-impact Hopkinson system was developed at ECN. It permits to perform dynamic tests at very high strain rates exceeding the range of the traditional Split Hopkinson Pressure Bars and hence enable us to identify constitutive models for a wide range of strain rates. The alloy used to test this device was Ti-6Al-4V. Strain rates up to 2.5×103 s-1 were attained.
Subject Headings: high strain rate
direct impact Kolsky bar
inverse analysis
Issue Date: 2016-04-27
Is part of: 7th International Conference on High Speed Forming, April 27th-28th 2016, Dortmund, Germany
Appears in Collections:ICHSF 2016

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