In order to evaluate the hydrogen-defect interactions, an internal friction study is performed on hydrogen-charged cold rolled ultra-low carbon steel. For this purpose, steel subjected various thermo-mechanical treatments and information hydrogen-dislocation interactions are obtained via thorough analysis of so-called hydrogen work peak by friction. Using existing theoretical models, could be d...

In this article, the anti-plane deformation of an orthotropic sector with multiple defects is studied analytically. The solution of a Volterra-type screw dislocation problem in a sector is first obtained by means of a finite Fourier cosine transform. The closed form solution is then derived for displacement and stress fields over the sector domain. Next, the distributed dislocation method is em...

Dislocation dynamics simulations of the interaction between prismatic dipolar loops and a glide screw dislocation are presented. As a result of stress gradients generated by the glide dislocation, dipolar loops execute drift motion along their glide cylinders. Simulations of the combined motion of two dipolar loops in the stress field of a glide dislocation clearly show that inter-loop forces a...

A case of complex paediatric elbow trauma, comprising of fracture lateral condyle associated with posterior dislocation of elbow is presented. Concomitant elbow dislocation was managed by closed reduction under sedation, assessing the elbow stability under general anaesthesia along with lateral condylar fracture fixation using cannulated cancellous screw. The patient had an uneventful recovery ...

The structure of the “star” defect in 4H-SiC substrates and its effects on the extended defect structures in the epilayers were studied by molten KOH etching and transmission x-ray topography. Star defects consist of a center region with high densities of threading dislocations (both edge and screw types) and six arms of dislocation arrays extending along <11-20> directions. In addition, multip...

We compare mechanical strength of f.c.c. gold and b.c.c. molybdenum single crystal pillars of sub-micrometer diameter in uniaxial compression ests. Both crystals show an increase of flow stress with decreasing diameter, but the change is more pronounced in Au than in Mo. The ratio etween the observed maximum flow stress and the theoretical strength is much larger in Au pillars than in Mo pillar...

Initial dislocation structure in annealed high-purity Mo single crystals and deformation substructure in a crystal subjected to 1% compression have been examined and studied using transmission electron microscopy (TEM) techniques in order to investigate dislocation multiplication mechanisms in the early stage of plastic deformation. The initial dislocation density is in a range of 10 ∼ 10 cm, a...

In the present paper we investigate classical self-interaction associated with a charged scalar point particle placed at rest in gravitational field of linear topological defect known literature as cosmic dispiration, combination string screw dislocation. We found exact expressions for Green's function and, consequently, self-energy by considering both massive and massless particles. numerical ...

This study evaluated complications associated with implant depth in headless compression screw treatment of an osteochondral fracture associated with a traumatic patellar dislocation in a 21-year-old woman. Computed tomography and X-rays showed one lateral fracture fragment measuring 25 × 16 mm. Osteosynthesis was performed with two headless compression screws. Five months later, the screws wer...