Jireh J. Yue's Fracture Contract

Energy Theorems that are related to fracture

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).