Dislocation Image Force
Dislocation Image Force - Related Videos
08:30
Intra-articular Shoulder Injection for Reduction Following Shoulder Dislocation
0 Views •
2023
Source: Rachel Liu, BAO, MBBCh, Emergency Medicine, Yale School of Medicine, New Haven, Connecticut, USA The anterior shoulder dislocation is one of the most common joint dislocations seen in emergency settings. In anterior shoulder dislocation, the humeral head is displaced out of the glenohumeral joint in front of the scapular glenoid, resulting in a loss of the articulation between the arm and the rest of the shoulder. This can be caused by a fall onto an abducted, extended, and externally...
10:15
Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
0 Views •
Cited by 34 •
2015
We describe a protocol for preparation of supported lipid bilayers and its characterization using atomic force microscopy and force spectroscopy.
10:03
Bacterial Immobilization for Imaging by Atomic Force Microscopy
0 Views •
Cited by 36 •
2011
Live Gram-negative and Gram-positive bacteria can be immobilized on gelatin-coated mica and imaged in liquid using Atomic Force Microscopy (AFM).
02:28
Imaging Polysomes Isolated from a Mouse Brain Using Atomic Force Microscopy
0 Views •
2025
Source: Lunelli, L., et. al. Peering at Brain Polysomes with Atomic Force Microscopy. J. Vis. Exp.(2016).This video demonstrates the imaging of polysomes using atomic force microscopy. A nickel-ions-coated mica sheet anchors RNA with attached ribosomes. The sample is washed, dried, and mounted onto the microscope stage. The cantilever tip scans the sample surface, recording laser deflections to map the topology. Software is used to correct distortions and visualize high-resolution polysome...
08:41
Single Wavelength Shadow Imaging of Caenorhabditis elegans Locomotion Including Force Estimates
0 Views •
Cited by 2 •
2014
The technique presented here measures the path of freely swimming microscopic species using single wavelength exposure. C. elegans are used to demonstrate shadow imaging as an inexpensive alternative to costly microscopes. This technique can be adapted to accommodate various orientations, environments and species to measure direction, speed, acceleration and forces.
FAQs
The image-dislocation construction replaces the boundary problem with an equivalent defect whose elastic field represents the boundary-induced change. The real dislocation then interacts with that field, so the calculated interaction gives the direction of boundary-driven motion. For a traction-free surface, this interaction is typically attractive, providing a mechanical basis for migration toward and eventual escape from the surface.
The key energetic consequence is a reduction in elastic energy as the dislocation approaches a traction-free surface. Lower energy makes motion toward the boundary favorable, rather than merely describing a static stress perturbation. In engineering analyses, this energy change helps explain why a surface can promote dislocation escape and alter how plastic deformation develops near the exterior of a crystal.
An interface changes the dislocation’s surrounding elastic environment. Its presence modifies the stress field, so the resulting interaction can influence defect mobility even when the dislocation remains inside the crystal. The image-force framework therefore gives engineers a way to examine interface effects alongside free-surface effects without assuming that all boundaries produce identical mechanical behavior.
Start by identifying the dislocation and the nearby boundary, then represent the boundary effect with an equivalent image dislocation. Determine the resulting interaction and assess its effect on elastic energy and motion. This sequence connects a boundary-modified stress field to practical predictions about attraction, dislocation escape, and possible surface or interface contributions to plastic deformation.
In thin films, boundary-driven dislocation motion is relevant to relaxation because defects can move in response to nearby surfaces or interfaces. At a surface, dislocation escape can leave a surface step, linking an internal defect process to a visible morphological change. These connections make image-force analysis useful for interpreting deformation and stress relief in engineered crystalline materials.
In nanoscale materials, nearby boundaries play an important role in the defect environment, so image-force effects can influence whether dislocations remain available for plastic deformation or leave the crystal. That behavior is relevant to strength and the onset of yielding. Engineering studies can therefore connect defect mobility and escape with the mechanical response of metals and other crystalline solids.