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PERFORMANCE OF A TANTALUM FOR APPLICATIONS OF EXPLOSIVELY FORMED PROJECTILES
Abstract
The deformation rate of explosively formed projectiles (EFPs) are extremely high, at the strain rate orders of more than a half million strain per second. The deformation occurs often at the magnitude of several hundred percent of strain, and the adiabatic heat is considerable. Challenges for developing a material model suitable for simulations of the projectile lies in the limitation of material testing where the strain rates used often are several orders of magnitude lower than what occurs in EFP projectiles. In this work, an effort is made to establish a dislocation thermal dynamics based model for a batch of tantalum to characterise its material behaviour at extreme strain rate, magnitude, and temperature, based on conventional material test results for both room and elevated temperatures at moderate strain rates. The validation of numerical simulations with this model for the EFP test results shows that there is a potential with the theoretical model based on the dislocation movement for such applications.
DOI
10.12783/ballistics22/36161
10.12783/ballistics22/36161
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