2021-04-07 08:00:00
The effect of tensile residual stress is quite significant in determining the lifetime of a material as it affects the crack propagation by influencing significantly the fatigue life. Here we demonstrate that the emission of dislocations in fatigue results in significant lattice rotation and…
Hydrogen bonding, being of similar strength as Van der Waals forces, play a singular role in life as they provide many of the critical, life-sustaining properties of water and also stabilize macromolecular organization producing some of the most consequential outcomes such as stabilization of…
We present a new methodology, coupling between acoustic emission measurements and in situ scanning electron microscopy experiments to quantify the evolution of damage and crack initiation in single crystal nickel microcrystals. The mechanical properties are continuously monitored during the loading using dynamic measurements and…
With the new era of the Army Futures Command, the Army is in the midst of a substantial modernization effort. To meet this challenge at the basic research level, modernized experimentation technologies can be developed that increase the discovery rate of superior performing materials…
Machine learning algorithms, in conjunction with high-throughput atomistic simulations, are used to probe the uncertainty within the energetics, structure, and mechanical response of silicon carbide grain boundaries. In this work, a Metropolis style Monte Carlo algorithm is applied to tilt and twist grain boundaries…
With the high rates at which plastic deformations occur in ballistic impacts, failure by adiabatic shear localizations often plays prominent role effecting the performance of both the attacking projectile and the defending armor materials. Adiabatic shear failure has traditionally been viewed as a negative…
Recent shock physics capability developments at X-ray light sources have resulted in the performance of experiments at much higher rates and with very disparate data types. The data from these experiments commonly consists of velocimetry data that provide information about bulk volumetric response of…
We developed a three-dimensional computational model of the brain for studying harmonic deformations in the brain. Relevant substructures of the head are constructed from magnetic resonance imaging scans. Harmonic wave motions in a live human brain obtained in an MRE experiment were used to…
High brilliance synchrotron sources of high energy x-rays have recently provided researchers with a new class of 4D (in-situ and in-operando) techniques for assessing the evolution of strain and crystal orientation within individual grains of a polycrystal. Researchers can now measure the single-crystal elastic…
The presentation will discuss how virtual diffraction experiments and data analytics can be used simultaneously to derive numerically efficient models that can relate diffraction peak broadening to dislocation content in a deformed microstructure. Specifically, a new algorithm will be presented to generate virtual diffraction…