Radiation Instability of Thermally Stable Nanocrystalline Pt-Au System
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Schoell, Ryan Michael↗
Engineering topics
Barr, Christopher Michael
Publications and source records attributed to Barr, Christopher Michael.
Development of an in situ ion irradiation scanning electron microscope
An in situ ion irradiation scanning electron microscope (I 3 SEM) has been developed, installed, and integrated into the Ion Beam Laboratory at Sandia National Laboratories. The I 3 SEM facility combines a field emission, variable pressure, scanning electron microscope, a 6 MV tandem accelerator, high flux low energy ion source, an 808 nm-wavelength laser, and multiple stages to control the thermal and mechanical state of the sample observed. The facility advances real-time understanding of materials evolution under combined environments at the mesoscale. As highlighted in multiple examples, this unique combination of tools is optimized for studying mesoscale material response in overlapping extreme environments, allowing for simultaneous ion irradiation, implantation, laser bombardment, conductive heating, cooling, and mechanical deformation.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Connecting Thermal Stability to Fatigue and Wear Resistance in Nanocrystalline Binary Alloys.
Abstract not provided.
Boyce, Brad↗
Inelastic peridynamic model for molecular crystal particles
The peridynamic theory of solid mechanics is applied to modeling the deformation and fracture of micrometer-sized particles made of organic crystalline material. A new peridynamic material model is proposed to reproduce the elastic–plastic response, creep, and fracture that are observed in experiments. The model is implemented in a three-dimensional, meshless Lagrangian simulation code. In the small deformation, elastic regime, the model agrees well with classical Hertzian contact analysis for a sphere compressed between rigid plates. Under higher load, material and geometrical nonlinearity is predicted, leading to fracture. Finally, the material parameters for the energetic material CL-20 are evaluated from nanoindentation test data on the cyclic compression and failure of micrometer-sized grains.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗