Two oppositely oriented dislocations

Jan 17, 2013

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Two oppositely oriented dislocations. Going…. Going…. Gone. Dislocations are annihilated. Nothing to slide so strength increases.

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Two oppositely oriented dislocations

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Two oppositely oriented dislocations
Going…
Going…
Gone
Dislocations are annihilated. Nothing to slide so strength increases

Perilunate dislocations

General points. Can be missed easilyIf left untreated lead to high incidence of long term functional disability and chronic pain.Perilunate dislocations more common than lunate dislocations. Mechanism of injury. Hyperdorsiflexion of wristHyperextension of wristUsually due to high-energy trauma t

680 views • 25 slides

DISLOCATIONS

DISLOCATIONS. Edge dislocation Screw dislocation. Plastic Deformation in Crystalline Materials. Creep Mechanisms. Slip (Dislocation motion). Twinning. Phase Transformation. Grain boundary sliding. Vacancy diffusion. Dislocation climb. Plastic deformation of a crystal by shear.  m.

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Dislocations

Dislocations. Basic concepts edge dislocation screw dislocation Characteristics of Dislocations lattice strains Slip Systems slip in single crystals polycrystalline deformation Twinning. Edge Dislocation.

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JOINT DISLOCATIONS

JOINT DISLOCATIONS. BY ROBERT BELDING MD. JOINT DISLOCATIONS. Definition

512 views • 16 slides

Dislocations Dislocations Dislocations

Dislocations Dislocations Dislocations. Dislocations are very important imperfections in real materials. Dislocations are line imperfections in otherwise perfect lattices. Dislocations are formed during solidification, during processing or when the material is deformed.

761 views • 28 slides

Partial Dislocations

Partial Dislocations. Lauren Ayers 22.71 . Outline. Partial Dislocations Why Partials? Stacking Faults Lomer-Cottrel Lock Force on a Dislocation Line Tension Model Dislocation Density. Partial Dislocations. Single unit dislocation can break down into two Shockley partials. b1.

580 views • 12 slides

MeVArc Summary: Dislocations

Marc Fivel – 3D Discrete Dislocation Dynamics Simulations TEM video showing a Frank Read Source in action Persistent Slip Band formation – Model/Simulation/Experimental Evidence Aarne Pohjonen – Dislocation mechanisms on a near surface void Steve Fitzgerald – Dislocations

243 views • 7 slides

Dislocations Animations

Dislocations Animations. Movement of edge dislocation Movement of mixed dislocation Frank-Reed model. BACK.

256 views • 2 slides

TARSOMETATARSAL DISLOCATIONS

TARSOMETATARSAL DISLOCATIONS. Lisfranc injuries. Anatomy. Examination. Xrays Weightbearing if possible AP+LAT+OBLIQUE. Oblique. Lateral. Weightbearing Xray.

254 views • 14 slides

Fractures, Sprains, and Dislocations

Fractures, Sprains, and Dislocations. Fractures. A break or a crack in a bone is called a fracture. Many types of fractures are difficult to determine. If a fracture is suspected, it’s wise to get it checked out. Fracture Categories. All fractures are one of two types

978 views • 23 slides

Two Proof-Oriented Triangle Theorems

Two Proof-Oriented Triangle Theorems. Lesson 7.2. Theorem 53: If 2 angles of one triangle are congruent to two angles of a second triangle, then the third angles are congruent. (no-choice Theorem). F. C. B. A. D. E. If <A congruent <D <B congruent <E Then <C congruent <F

145 views • 5 slides

Dislocations

When you ask a question, do you really want to know the answer, or are you merely flaunting your power? -Dmitri Harkonnen. Dislocations. Today's objective – how to make these guys work harder. Work hardening. So what happened (coat hanger)?. Dislocations moved when coat hanger bent.

302 views • 15 slides

Dislocations & Colloids

Dislocations: Line defects in 3D xtals. Point defects in 2D xstals (Often difficult to study in atomic systems) Colloids: small particles that are Brownian and therefore thermal (Form crystals, easy to see, slow). Dislocations & Colloids. Schall et al., SCIENCE 305, 1944-1948 (Sep 2004)

522 views • 32 slides

TRAUMATOLOGY. FRACTURES AND DISLOCATIONS.

841 views • 32 slides

Dislocations

Dislocations. Dislocations are very important imperfections in real materials. Dislocations are line imperfections in otherwise perfect lattices. Dislocations are formed during solidification or when the material is deformed.

964 views • 27 slides

Dislocations + GB/Interfaces

Dislocations + GB/Interfaces. Stress at heterointerfaces can be relieved by dislocations Other dislocations interact with GBs & Interfaces In general, these are barriers Classic Hall-Petch effect. Boundaries as Barriers. GB+dislocation Dislocations in GB interact with dislocation

386 views • 19 slides

7.2 Two Proof-Oriented Triangle theorems

7.2 Two Proof-Oriented Triangle theorems. Objective: After studying this section, you will be able to apply the no-choice theorem and the AAS theorem. Theorem.

217 views • 6 slides

DISLOCATIONS

MATERIALS SCIENCE & ENGINEERING. Part of. A Learner’s Guide. AN INTRODUCTORY E-BOOK. Anandh Subramaniam & Kantesh Balani Materials Science and Engineering (MSE) Indian Institute of Technology, Kanpur- 208016 Email: anandh@iitk.ac.in, URL: home.iitk.ac.in/~anandh.

2.7k views • 94 slides

Dislocations

Dislocations. Today's objective – how to make these guys work harder. Work hardening. So what happened (coat hanger)?. Dislocations moved when coat hanger bent. Dislocation generators produced large amounts of new dislocations. New dislocations so numerous that they entangled

297 views • 13 slides

L05B: Line defects (dislocations)

L05B: Line defects (dislocations). Two basic types – edge and screw, plus a mixture of these. The edge dislocation can be imagined as being formed by an extra half-plane of atoms inserted into the structure (or removal of half a plane). Note distortion of lattice caused by its presence.

1.05k views • 5 slides

Dislocations - Initial overview

But it cannot be deformed plastically. Dislocations - Initial overview. Material w/ NO dislocations is very strong. Dislocations weaken a material. But dislocations make plastic deformation possible. Dislocations - need to control slip. Easier movement along slip planes means

133 views • 12 slides

Midfoot Fractures and Dislocations

Midfoot Fractures and Dislocations. Anna N. Miller, MD, and Bruce Sangeorzan, MD University of Washington Harborview Medical Center Revised October 2011 Based on the work of Drs. A. Walling and C. Jones. Contents. Lisfranc Joint Injury Diagnosis Treatment Outcomes Midfoot Crush

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Two oppositely oriented dislocations

Two oppositely oriented dislocations

Presentation Transcript

Perilunate dislocations

DISLOCATIONS

Dislocations

JOINT DISLOCATIONS

Dislocations Dislocations Dislocations

Partial Dislocations

MeVArc Summary: Dislocations

Dislocations Animations

TARSOMETATARSAL DISLOCATIONS

Fractures, Sprains, and Dislocations

Two Proof-Oriented Triangle Theorems

Dislocations

Dislocations &amp; Colloids

TRAUMATOLOGY. FRACTURES AND DISLOCATIONS.

Dislocations

Dislocations + GB/Interfaces

7.2 Two Proof-Oriented Triangle theorems

DISLOCATIONS

Dislocations

L05B: Line defects (dislocations)

Dislocations - Initial overview

Midfoot Fractures and Dislocations

Dislocations & Colloids