Failure Analaysis

   Failure as a Design      Criterion

   Fracture Mechanics


Tutorial Questions


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


Stress Intensity Factor and Fracture Toughness Testing


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


Theory Resource

Problem 1

This question should take about 10 minutes to complete. It is an introductory level question.

A sheet of glass measuring 2 m by 200 mm by 2 mm contains a central slit parallel to the 200 mm side. The sheet is restrained at one end and loaded in tension with a mass of 500 kg.

What is the maximum allowable length of slit before fracture occurs?

Assume the following material property values: E = 60 GPa, surface energy is 0.5 J/m2, Poissons ratio = 0.25 and the fracture stress of sound glass is 170 MPa.

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Failure Analysis  -  Fracture Mechanics  -  Failure As A Design Criterion