Dynamic response of a U-0.75wt%Ti alloy has been studied in planar (disk-on-disk), reverse (disk-on-rod) and Symmetric (rod-on-rod) ballistic impact experiments performed with a 25 mm light-gas gun. The impact velocities ranged between 100 and 500 m/sec and the samples were softly recovered for further examination, revealing different degrees of spall fracture (planar impact) and of adiabatic shear bands (ballistic experiments). The back (planar experiments) and the lateral (ballistic experiments) surface velocities were continuously monitored by VTSAR. The velocity profiles and the damage maps were simulated using a 2-D AUTODYN™ Lagrangian finite differences code. Simulations of the planar experiments were performed with special attention to the compressive path of the loading cycle in order to calibrate a modified Steinberg-Cochran-Guinan (SCG) constitutive model. The Bauschinger effect and a single-parameter spall model were added to describe the unloading and tensile paths. The calibrated SCG model was then employed to simulate the ballistic experiments. An erosion AUTODYN built-in subroutine with a threshold value of plastic strain was chosen to describe the failure in the ballistic impact experiments. The results of the suggested experimental-numerical technique can be taken into account in estimating the different contributions to the shock-induced plastic deformation and failure.
|Number of pages||6|
|Journal||Journal De Physique. IV : JP|
|State||Published - 1 Jan 2003|
|Event||Eurodymat 2003: 7th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading - Porto, Portugal|
Duration: 8 Sep 2003 → 12 Sep 2003
ASJC Scopus subject areas
- Physics and Astronomy (all)