Direct-impact Hopkinson tests on the Ti-6Al-4V alloy at very high strain rate and inverse identification of the Johnson-Cook constitutive model - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2015

Direct-impact Hopkinson tests on the Ti-6Al-4V alloy at very high strain rate and inverse identification of the Johnson-Cook constitutive model

Résumé

The study of the material performance at high strain rate is an important topic in material sciences, since the materials usually exhibit strong viscous effects as the rate rises. In some material processes, the metallic materials may experience very high strain rates up to 10 6 s −1 , such as the laser shock peening (Yu et al., 2009). Studying the dynamic behaviour of the materials requires to perform dynamic tests on a wide range of strain rate. The classical Split Hopkionson Pressure Bar (SHPB), also referred to as the Kolsky bar (Davies, 1948; Kolsky, 1949), is a simple device that is widely adopted to perform such dynamic tests. The classical SHPB device is capable to attain strain rates ranging from 10 2 to 10 4 s −1 (Gorham et al., 1992; Ramesh, 2008). Attempting to reach higher strain rate may yield the incident bar. Thus a direct-impact Hopkinson device has been developed (Dharan and Hauser, 1970) by removing the incident bar. On this direct-impact device, a very high strain rate of the order of 10 5 s −1 is achieved by Dharan and Hauser (1970) and Kamler et al. (1995). In this work, the Ti-6Al-4V alloy is tested on a direct-impact Hopkinson device at strain rates ranging from 3000 to 25000s −1. Then an inverse identification is carried out to identify the Johnson-Cook model (Johnson and Cook, 1983) for the Ti-6Al-4V on this wide range of strain rates.
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hal-02279965 , version 1 (05-09-2019)

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  • HAL Id : hal-02279965 , version 1

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Xiaoli Guo, Thomas Heuzé, Guillaume Racineux, Ramzi Othman. Direct-impact Hopkinson tests on the Ti-6Al-4V alloy at very high strain rate and inverse identification of the Johnson-Cook constitutive model. MECAMAT, Jan 2015, Aussois, France. ⟨hal-02279965⟩
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