The failure mechanism in porous rocks is of interest to geomechanics, defense, and planetary science applications. In this poster, we discuss ongoing work investigating the influence of water saturation on the mechanical properties and failure mechanics of sandstone. Previous studies have shown that the…
Eutectic high entropy alloy (EHEA) AlCoCrFeNi2.1, additively manufactured through laser powder bed fusion, has both high strength and ductility due to its far-from-equilibrium, dual-phase nanolamellar structure consisting of both fcc and bcc phases [1]. Understanding high pressure behavior of EHEAs is essential both for…
An important consideration for space missions is the likelihood of contamination, either of terrestrial organisms to a planetary body which may sustain life (forward contamination), or of potential extraterrestrial lifeforms that are brought back through sample return (backward contamination). To identify the limits of…
A continuum theory is formulated for large deformations, thermal effects, constituent interactions, and degradation of soft biological tissues. Such tissues consist of one or more solid and fluid phases and can demonstrate nonlinear anisotropic elastic, viscoelastic, thermoelastic, and poroelastic deformation mechanisms. Under extremely large…
The Air Force Research Laboratory has interests in increasing the mechanical resilience of highly loaded composite systems that must survive harsh thermomechanical environments. Mechanical failure is commonly induced and propagated in these materials at the interfaces between the matrix and particulate constituents. In this…
Since their rapid adoption over the last two decades, polyurea elastomer coatings have become an essential component in ballistic protection materials and armor coatings. Polyurea’s copolymer architecture forms microphase separated nanostructures of “hard” and “soft” domains that are rich and poor in hydrogen-bond forming…
The Laser-Induced Particle Impact Test (LIPIT) can be used to probe projectile, target, and synergistic projectile-target responses to high strain rate deformation at the microscale. LIPIT’s advantages over other microscale launching techniques include the ability to controllably launch a single microparticle and precisely characterize…
Conventional mechanical testing has significantly advanced our understanding of material behavior under various conditions. However, the mechanical characterization of materials at the intersection of small scales and high strain rates remains largely qualitative and time intensive. This research presents an advance using Laser Induced…
Understanding the damage and failure of structural materials under extreme mechanical loads such as hypervelocity impact, which combines high strain rates, tri-axial stress, and temperature, is important for a range of applications including space exploration and defense. Niobium (Nb) is a BCC transition metal…
Designing materials using a combinatorial approach to achieve desired mechanical properties requires multiple iterations. The cost of conducting experiments for each iteration to determine the material properties can be prohibitively high. One alternative is to use computational models, but running high-fidelity physics-based simulations can…