| 摘要 |
Method for measuring residual initial strains in a test piece (2) involves extraction of a test piece from a material sample for which it is desired to know the initial strains. After extraction the test piece is machined in a continuous manner so that the initial strains are not modified in a measurement zone. Deformations induced by machining are measured along three directions. Finally, the distribution of residual strains and their principle directions are determined as a function of the height of the test piece. The invention also relates to a corresponding device for implementation of the procedure with a means for continuous machining of the sample, e.g. using a chemical treatment bath, and data acquisition means comprising strain gauges that are not in contact with the chemical bath, ultrasonic thickness measurement means and a Wheatsone bridge measurement circuit.
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