# Kamyar M Davoudi's blog

## Lecture 6: Introduction to Dislocations

These slides are used in a course on Plastic Deformation in Crystalline Solids.

## Lecture 4: Quick Review of Thermodynamics

These slides are used in a course on Plastic Deformation in Crystalline Solids.

## Lecture 2: Introduction to Crystallography

These slides are used in a course on Plastic Deformation in Crystalline Solids.

## Dislocation Climb in Two-Dimensional Discrete Dislocation Dynamics

In this paper, dislocation climb is incorporated in a two-dimensional discrete dislocation dynamics model. Calculations are carried out for polycrystalline thin films, passivated on one or both surfaces. Climb allows dislocations to escape from dislocation pile-ups and reduces the strain-hardening rate, especially for fully passivated films. Within the framework of this model, climb modifies the dislocation structures that develop during plastic deformation and results in the formation of pile-ups on slip planes that do not contain any dislocation sources.

## Some books on Fracture Mechanics

This book is in line with what Zhigang is teaching in class. Because Kejie and Widusha have already recommended this book, I would like to introduce you some other books as well as a different approach to cracks and Fracture Mechanics.

## Decomposition of the displacement gradient into elastic and plastic parts

We know that total strain is the symmetric part of the displacement gradient. Total strain can be represented by the sum of the elastic and plastic (eigen) strains. Let consider a dislocation in an arbitrary solid. Suppose we computed the displacement filed, therefore the total strain can be obtained immediately. What are the criteria for the decomposition of the total strain into elastic and plastic parts?