2021-04-07 08:00:00
A thermodynamically-consistent viscoplastic damage model was used to elucidate dynamic compressive response of an HCP material beryllium. Twins accommodate plastic deformation, which is otherwise limited by the contribution from dislocation slip in HCP metals. An isotropic model for deformation twinning adapted in this work…
A variety of projectiles can be accelerated using pulsed lasers, from planar metal flyer foils to spherical projectiles. This selectability of impactor geometry offers adjustable loading conditions in stress space. Here we explore the spall failure, changes in hugoniot elastic limit, shear banding, and…
Magnesium alloys are an attractive material system for protection applications owing to their high specific strength and stiffness, but have low failure strains relative to similar strength lightweight metals in this application (e.g. Aluminum). The plastic anisotropy from the low-symmetry HCP crystal structure and…
With the advantages such as high stiffness, fracture toughness, delamination resistance, and a high threshold for damage tolerance, woven fibers composites are widely used in load-bearing and impact resistance applications. Due to the complexity of the woven composite’s geometry, it is hard to establish…
Concurrent in-situ flash X-ray radiography, Photon Doppler Velocimetry (pdv), and high-speed video using the ARL HIDRA provides microsecond-resolved information during ballistic impact experiments. Manual image analysis, although laborious and time intensive, provides characterization of dwell time, penetration velocity, and timing of break-out of the…
High speed machining (HSM) is an advanced machining technology with great future potential. It is widely oberved that the continuous smooth chip flow breaks down and serrated chip flow begins to form with cutting speed increasing, which is found to be ascribed to a…
Boron carbide is a candidate in many armor applications because it has an exceptional specific strength (hardness approaching 30 GPa and low density of ~2.5 g/cc). In practice, wider use of this material has been limited because it is well-known to show a loss…
Given the complex nature of traumatic brain injury (TBI), it has been challenging to identify a single kinematic tolerance threshold that correlates directly with injury risk. In this study, we investigate the role of acceleration, velocity, and jerk on the brain tissue response in…
The present work focuses on the development of a new class of interatomic potential known as a “physically-informed neural network” (PINN) potential. This new potential format combines the high level of accuracy and flexibility associated with artificial neural networks (ANNs) with the transferability inherent…
Stress field prediction in the field of computational solid mechanics using deep learning is an ongoing topic of research. We consider a 2-d fiber-reinforced matrix composite plate where the constituent materials (fiber and matrix) are linear and elastic. When the plate is subjected to…