Numerical Simulation of Edge Effects of Gas Gun Experiments
Dr. Michel Arrigoni, Ensieta
High velocity Plate impacts on structures allow generating
shock waves.
Depending on the shock propagation, a high
tensile stress may occur within the material that can crack
-- or spall. When the thickness of the target sample is much
thinner than its transversal dimension, stresses are almost
in quasi one-dimension (1D). This situation was used for elaborating
models for dynamic fracture in 1D.
In order to estimate the numeric codes ability of reproducing
experiments in 2D, shots have been performed with several
diameters of projectiles launched by gas gun. Multi-point
laser Doppler Interferometry has been used for recording the
free surface velocity of the target at several locations.
Records of these experiments have been compared with numerical
simulation performed with the code RADIOSS.
Results show that results are in agreement with experiments
for experimental velocities as well as for fracture locations.
It allows also a better understanding of damage mechanisms
by edge effects.
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