2025-04-09 09:00:00
There is a growing interest in dynamic indentation due to its capacity to characterize the high strain rate mechanical response of small volumes of materials. Our objective is to understand the dynamic indentation response of elasto-viscoplastic materials and explore the extent to which this…
Impact loading induces damage as shock waves reflect off free surfaces, creating tension and initiating the nucleation, growth, and coalescence of a pore network. Typically, this is simulated by examining the behavior of a spherical shell under an isochoric approximation. This shell stems from…
Global sensitivity analysis (GSA) is widely used in engineering design to study the inner workings of complex models by analyzing how model inputs contribute to the model response. This proves especially beneficial in materials design for characterizing material systems, guiding experiments, and extracting physical…
SAND2024-01658A: At Sandia National Laboratories, we are developing the tamped Richtmyer-Meshkov instability (RMI) method as a way of measuring the dynamic strength of materials at extreme pressures (0-100+ GPa), temperatures (ambient-melt), and strain rates (105-107 /s). In this talk, the tamped RMI method is described…
Aluminum is a commonly used ablator in shock and materials science ex- periments. The laser matter interactions governing the ablation depth of this aluminum are still not well known. We report on an experiment conducted at the LCLS Materials at Extreme Conditions (MEC) beamline…
Southwest Research Institute has been performing conventional (2 km/s) and hypervelocity (~5.5 km/s) laboratory impact tests on a range of materials (pumice, concrete, sandstone, plaster, pure iron, aluminum 2024, granite, basalt aggregates in relation to the DART mission, etc.) to better understand the “momentum…
When designing and building Photon Doppler Velocimetry (PDV) systems, single-mode optical fibers (SMF) and components are almost exclusively used due to the additional cost of using polarization maintaining (PM) components and added complexity, as well as the rareness of extremely low amplitude of the…
Novel nanomaterials tested at the microscale using the laser induced projectile impact testing (LIPIT) technique exhibit record high specific energy absorption (EP*), compared to widely used macroscale protective materials such as aluminum and Kevlar composites. However, harnessing these properties of nanomaterials at the bulk…
Spall experiments require loading facilities capable of generating extreme strain rates in materials of interest. These facilities generally require large investments towards obtaining a single experimental dataset and are typically by nature low throughput. Laser driven micro-flyer plate experiments to generate spall failure provide…
Understanding the spectrum of dynamic response in structural materials in extreme environments with statistical confidence requires the development of novel high-throughput experiments and analyses. We conducted laser-driven micro-flyer impact experiments on thin niobium foils with a simple body-centered cubic (bcc) structure to investigate its…
