Strength Response and Deformation Behavior of Tantalum Alloys via High-Rate Hole

Hole closure experiments allow for the probing of materials’ strengths at conditions of interest in the equivalent plastic strain and strain rate space (≥ 50% and ≥10⁵ s^-1, respectively) that are challenging to access experimentally. Previous work conducted by LLNL scientists has improved the experimental configuration to allow for better control over hole closure and avoidance of late-time porosity and anelastic effects from release waves. This experimental refinement, as well as model refinement, has led to higher-fidelity measurements to validate higher-fidelity strength models. Here, we will share results from hole closure experiments on Ta-W alloys and subsequent updated strength models of the material’s high-strain response. Furthermore, we hope the hole closure shots that reach larger strains can probe the onset of shear banding.



LLNL-ABS-2002626. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA2.