Failure Analaysis

   Failure as a Design      Criterion

   Fracture Mechanics

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Tutorial Questions


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Griffith Equation
- Fracture of Glass Sheet
- Fracture of Maraging Steel
- Relative Magnitudes of Plastic Work and Surface Energy
- Fracture of Perspex Sheet
- Fracture of Cast Iron
- Failure Criteria : Yield Versus Fracture
- Griffith Fracture Criterion
- Fracture of Alumina Grinding Wheel

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Stress Intensity Factor and Fracture Toughness Testing

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Characterising Sub-Critical Growth
 -  Fatigue Life Prediction
 -  Stress Corrosion Cracking

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Theory Resource




Problem 4

This question should take about 15 minutes to complete. It requires some thought about the specimen dimensions used in calculating bending stresses.
A rectangular perspex plate 600 mm by 300 mm by 6 mm thick is scribed into two equal squares by a knife, leaving a uniform cut of depth 0.3 mm.

What is the bending moment required to break the plate if the perspex has a work to fracture of 500 J/m2?

Note that E = 2.5 GPa for perspex.

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