The governing equation of screw dislocations in heterostructures is constructed using image method. The interface type (−1 ≤ γ ≤ 1) and distance between dislocation and interface h are considered in the new equation. The Peierls–Nabarro equations for screw dislocations in bulk and semi-infinite materials can be recovered when γ = 0 and γ = −1. The soft (γ < 0) and hard (γ > 0) interfaces can en...

This report describes a rare case of concomitant ipsilateral pelvic disruption, hip dislocation, a femoral shaft fracture, supra and intercondylar fracture of the femur, and tibial shaft fracture in a young man who suffered a fall from a moving truck. The hip dislocation was reduced under general anaesthesia with a closed procedure. Both femoral shaft and distal femoral fractures were reduced a...

We explain the geometrical meaning of the metric of space-time. Then, we derive the light deflection caused by the screw dislocation in space-time. The derivation is based on the idea that space-time is a medium which can be deformed in such a way that the deformation of space-time is equivalent to the existence of metric which is equivalent to gravity. The existence of the screw dislocation in...

In this paper, the analytical solution of an electric and Volterra edge dislocation in a functionally graded piezoelectric (FGP) medium is obtained by means of complex Fourier transform. The system is subjected to in-plane mechanical and electrical loading. The material properties of the medium vary exponentially with coordinating parallel to the crack. In this study, the rate of the gradual ch...

Structure, formation energy and mobility of kinks in 1/2a<111> screw dislocation in metallic Ta have been investigated via low temperature (0.001K) molecular dynamics with a new, first principle based, Embedded-Atom-Model (EAM) potential. We studied a/3<112> kinks using a simulation cell containing four dislocations in a quadrupolar arrangement. We impose periodic boundary conditions in the dir...

Nanoindentation has proved to be a technique capable of elucidating the mechanical properties of solid surfaces. Along with recent studies [1,2], our investigation deals with the initial stages of plastic deformation in a solid. In previous works [3,4] we have recognized and characterized by scanning tunneling microscopy (STM) the generation around a nanoindentation trace in Au(001) of two type...

A FGM layer sandwiched between two isotropic layers weakened by several interface cracks under antiplane loading is studied. This paper examines the modelling of cracks by distribution of strain nuclei along crack lines. In this investigation, the Volterra-type screw dislocation employed between FGM and an elastic layer. To solve the dislocation problem, the complex Fourier transform is applied...

A FGM layer sandwiched between two isotropic layers weakened by several interface cracks under antiplane loading is studied. This paper examines the modelling of cracks by distribution of strain nuclei along crack lines. In this investigation, the Volterra-type screw dislocation employed between FGM and an elastic layer. To solve the dislocation problem, the complex Fourier transform is applied...

OBJECTIVES To study the influence of forefoot plantar pressure of the first tarsometatarsal joint fracture-dislocation by three different implants to provide experimental reference in selecting implants. METHODS Eight fresh foot specimens were made into the models of the first tarsometatarsal joint fracture-dislocation, which were fixed with 3.5 mm cortical screw, 1/4 tubular plate and compre...