Failure Analaysis

   Failure as a Design      Criterion

   Fracture Mechanics

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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

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Stress Intensity Factor and Fracture Toughness Testing

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

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Theory Resource




Problem 3

This question should take about 10 minutes to complete. It is an introductory level question.
A thin sheet of maraging steel has a tensile strength of 1950 MPa. Calculate the percentage reduction in strength due to the presence of a crack in the sheet, which is 4 mm long and orientated perpendicular to the stressed direction.

For this steel, E can be taken as 200 GPa, the energy of fracture surface as 2 J/m2, and the work of plastic deformation of each crack tip is 2x104 J/m2.

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