Contact Pressure Measurement by Means of Ultrasonic Waves : On a Bolted Joint with a Solid-metal Flat Gasket

概要

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A quantitative measurement of contact pressure by means of ultrasonic waves using a normal probe has been proposed to measure the contact pressure on a bolted joint with a solid-metal flat gasket. At first, in a proposed calibration method, the relation between mean contact pressure and sound pressure of reflected waves is obtained using the calibration blocks with various surface roughnesses and heights made of the same material as the bolted joint. Both sides of the laminated finite hollow cylinders are compressed under a locally uniform pressure, and the sound pressure of reflected waves is measured. From these relations, the contact pressure is obtained. The experimental results agree approximately with the theoretical ones. It is demonstrated that the gasket has an effect of preventing the leakage and the proposed ultrasonic method is practically useful.
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