Summary
In the past decade, a new technique has been developed for measuring tensile stresses in solids. This ultrasonic technique has been used thus far primarily for measuring fastener tension. The precision of measurement is routinely to 2–3% and, with special care, to ∼1%. The method is insensitive to the frictional losses which plague tensioning by torque wrench. Though the approach is relatively new, it promises a wide range of applicability.
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Smith, J.F., Greiner, J.D. Stress Measurement and Bolt Tensioning by Ultrasonic Methods. JOM 32, 34–36 (1980). https://doi.org/10.1007/BF03354562
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DOI: https://doi.org/10.1007/BF03354562