Reflection coefficient of ultrasonic waves as a measure of interface stresses in high pressure multi-layer cylinders

Abstract

Contact stresses in high pressure multi-layer cylinders are sometimes measured using ultrasonic technique. As a measure of the contact stresses the coefficient of reflection of ultrasonic waves from the contact interface between two adjacent outer layers is applied. The coefficient of reflection is an involved function of several parameters. Experimental and theoretical investigations show that this function may change non-monotonously with frequency of ultrasonic waves which may lead to an ambiguity of the assumed criterion. In order to check this function for higher frequencies, measurements of the reflection coefficient from a contact interface between plane steel samples were made for the frequencies up to 190 MHz.

Key Words:

• high pressure equipment
• multi-layer cylinders
• nondestructive testing
• ultrasonic measurements
• reflection coefficient