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Residual Stress Measurements


Procedure

Making residual stress measurements with the RS-200 Milling Guide consists of the following steps:
  1. A special three-element Micro-Measurements strain gage rosette is bonded to the test part at points where residual stresses are to be determined.

  2. Each rosette grid element is connected to a strain measuring instrument and "zero" readings are recorded.

  3. The RS-200 Milling Guide is positioned over the center of the gage and securely attached to the test part.

  4. The RS-200 is optically aligned so that its drilling axis is precisely positioned over the target at the center of the strain gage rosette.

  5. A hole is drilled through the center of the rosette and into the test part.

  6. Strain gage instrumentation is used to obtain strain readings.

  7. Residual stresses are then computed, either manually or by using the Vishay Measurements Group's RESTRESS software program. RESTRESS is available for use with most PC-compatible computers. RESTRESS provides data reduction in accordance with ASTM Standard Method E837, as well as approximate determination of residual stress variation with depth (refer to TN-503, Measurement of Residual Stresses By The Hole-Drilling Strain Gage Method ). A copy of RESTRESS can be downloaded from the Vishay Measurements Group Web site at ftp://ftp.measurementsgroup.com/restress for a 10-day evaluation at no charge.

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