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Fracture Mechanics
  Problem 7 This question tests your understanding of the Griffith theory, and is representative of typical examination questions in this area. It should take about 15 minutes to complete. Griffith postulated that brittle fracture occurred when the energy release rate during crack growth exceeded the rate that energy was required. His original analysis was performed for a brittle material (glass). a) Sketch curves showing how the changes in surface energy required, and potential energy released, as a crack extends. b) Sketch the changes in their differentials (rates R and G) with respect to crack length extension. Label the sketches and define the parameters R and G. c) State what the critical condition is for fracture, in terms of R and G. Scientific Calculator | RPN Calculator | Graph Plot | Theory Hint | Solution |
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Failure Analysis - Fracture Mechanics - Failure As A Design Criterion |