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Hole drilling method
Residual stresses reduce load capacities and mechanical components safety during every day operations, that is the reason why it is important to analyse these kind of stresses due to prevent mechanical equipment failures.
One of the most flexible, reliable and non-destructive technique for performingresidual stress analysis is the hole drilling method. The hole drilling method gives anhigh level of accuracy and is, in practice, inexpensive.
How does it work?
The hole drilling method consists in drilling a small and shallow hole (approx.1.8x2mm) at very high speed; in this way the initial strain conditions of the material change and a redistribution of residual stresses is allowed.
The complete hole drilling method test is made up by the following procedure:
- Installation of a three radial grid strain gauge rosette.
- Drilling of a small hole through the center of the rosette.
- Measurement of strains produced by relaxation of the residual stresses.
- Calculation of residual stresses from the strain measurements.
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SINT TECHNOLOGY SRL - P.IVA 04185870484
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28 Mar 2010 by Tad Distin
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