Fracture Contract for Jireh J. Yue

# Jireh J. Yue's Fracture Contract

Personal Contract for Fracture HomePage project (MSE 2094)

## Energy Theorems that are related to fracture

1. Griffith-Orowan-Irwin Concept
2. Elastic Energy (Specific Potential) Model
3. Strain Energy (based on crack tip modeling)

## Energy Methods

### Introduction and Background

• Terms : Elastic Energy, Strain Energy, kinetic energy related to crackspeed
Griffith-Irwin-Orowan fracture and failure concept, energy of fracture, energy release rate

### Griffith's Idea

• What is the role of energy?
• Crack Growth Illustration (Porter Pg. 69)
• Conditions necessary for fracture at the crack tip

### Griffith-Irwin-Orowan Concept for Failure

• Two major stages (crack initiation and crack propagation) and the criterion for each
• Schematic View of Crack Tip (Broek Pg. 77)

### Griffith-Irwin-Orowan Concept for Fracture

• Theorem
• Criterion for fracture

### Strain Energy Release Rate

• differences by using Mode I, II, and III
• dynamic energy release rate relationship between energy release rate and the crack tip intensity factor (Freund Pg. 223)
• formation of new surfaces are created at the faces of a crack

### Crack Speed and Kinetic Energy

• Factors that control crack speed
• Assumptions in the formula

### Fracture Energy of a Specimen of Different Sizes

• Basic Facts
• Proportion Law

### HTML

• Assistance : one page for energy methods
• one or two links to other images within document, links to "dictionary"

### Visualization

• At the most 10 images
• Some possible fractographic images showing deformation caused by specific surface energy or plastic deformation energy
• Elliptical Crack Figure (Callister Pg. 190)

### Energy Methods related to other group's works

• #### Experimental (Test Methods)

• Charpy Methods
• What does it measure?
• Graph of Charpy V-notch energy versus temperature behavior of various materials. (Pg. 19, Rolfe).
***Contents of the material may be subject to change as the project evolves. If you have any questions please contact me.