Nondestructive testing method for cable silicone rubber-crosslinked polyethylene interface pressure

A nondestructive testing method for cable silicone rubber-crosslinked polyethylene interface pressure comprises the following steps: in combination with a reflection wave expression of ultrasonic waves on a contact interface, deriving amplitude values of fundamental waves and second harmonic waves of echo signals, and obtaining an expression of ultrasonic nonlinear coefficients; carrying out interface pressure loading nonlinear ultrasonic test detection on the platy silicone rubber and platy crosslinked polyethylene samples, and calculating ultrasonic nonlinear coefficients of the silicone rubber-crosslinked polyethylene interface in different pressure states; performing data fitting on the ultrasonic nonlinear coefficient corresponding to the contact interface pressure value to obtain a relational expression of the silicone rubber-crosslinked polyethylene interface pressure and the ultrasonic nonlinear coefficient; through the steps, nonlinear ultrasonic detection of the cable silicone rubber-crosslinked pol