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Elucidating the Onset of Plasticity in Sliding Contacts Using Differential Computational Orientation Tomography
Abstract Depending on the mechanical and thermal energy introduced to a dry sliding interface, the near-surface regions of the mated bodies may undergo plastic deformation. In this work, we use large-scale molecular dynamics simulations to generate “differential computational orientation tomographs” (dCOT) and thus highlight changes to the microstructure near tribological FCC alloy surfaces, allowing us to detect subtle differences in lattice orientation and small distances in grain boundary migration. The analysis approach compares computationally generated orientation tomographs with their undeformed counterparts via a simple image analysis filter. We use our visualization method to discuss the acting microstructural mechanisms in a load- and time-resolved fashion, focusing on sliding conditions that lead to twinning, partial lattice rotation, and grain boundary-dominated processes. Extracting and laterally averaging the color saturation value of the generated tomographs allows us to produce quantitative time- and depth-resolved maps that give a good overview of the progress and severity of near-surface deformation. Corresponding maps of the lateral standard deviation in the color saturation show evidence of homogenization processes occurring in the tribologically loaded microstructure, frequently leading to the formation of a well-defined separation between deformed and undeformed regions. When integrated into a computational materials engineering framework, our approach could help optimize material design for tribological and other deformation problems. Graphic Abstract .
Automatic Crack Detection and Analysis for Biological Cellular Materials in X-Ray In Situ Tomography Measurements
Abstract not provided
Collaborative ductile rupture mechanisms of high-purity copper identified by in situ X-ray computed tomography
Abstract not provided
Time-lapse 3D Micro-tomography of Calcite Column Experiments to Study pH-Dependent Dynamic Dissolution Processes
Not Available
Detecting damage initiation in short fiber composites via in-situ X-ray tomography and digital volume correlation
Abstract not provided
Simulation of heterogeneous breakage in sand based on full-field X-ray tomography measurements
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Modeling as-manufactured fiber-reinforced microstructures based on X-ray microcomputed tomography
Not Available
Using soft X-ray tomography for rapid whole-cell quantitative imaging of SARS-CoV-2-infected cells
Not Available
Cranial and facial inter-landmark distances and tissue depth dataset from computed tomography scans of 388 living persons
Not Available
Local earthquake tomography of the Central Oregon forearc using a large-N, short duration, nodal array
Not Available