Dynamic damage in metal: porosity as a test for damage models

Joëlle Bontaz-Carion (1) , Michel Nicollet (1) , Philippe Manczur (1) , Yves-Patrick Pellegrini (1) , Elodie Boller (2) , Jose Baruchel (2)

1 DAM/DIF - DAM Île-de-France
2 ESRF - European Synchrotron Radiation Facility

Shocks can generate high strain rates in metals (from 10$^$4 to 10$^6$ s$^{-1}$), and can damage the sample up to the point of spallation. In ductile metals, the main damage mechanism is nucleation, growth and coalescence of pores. This paper presents microtomography measurements of porosity in shocked samples, made at the European Synchrotron Radiation Facility. The measurements are compared to the predictions of a damage model based on a recent viscoplastic extension of the Gurson model. It is found that the porosity level predicted by the model in a plate impact configuration disagrees with the measurements, though the free-surface-velocity curves are well captured by the model.

Keywords: ductile damage; plate impact experiement; shock wave; porous medium; porosity measurement; high strain rate; viscoplasticity; X-ray tomography; Gurson model

Domains: Mechanics of materials [physics.class-ph]; Mechanics of materials [physics.class-ph]

Joëlle Bontaz-Carion, Michel Nicollet, Philippe Manczur, Yves-Patrick Pellegrini, Elodie Boller, et al.. Dynamic damage in metal: porosity as a test for damage models. Fourth International Symposium on Impact Engineering (ISIE/4), Jul 2001, Kumamoto, Japan. pp.633-638. ⟨cea-00412997⟩