METHOD FOR DETERMINING THE ELASTIC MODULUS OF FIBERGLASS DURING ULTRASONIC NON-DESTRUCTIVE TESTING Russian patent published in 2021 - IPC G01N29/04 

FIELD: material engineering.

SUBSTANCE: invention can be used to determine the elastic modulus of fiberglass during ultrasonic non-destructive testing. The essence of the invention lies in the fact that pulses of ultrasonic vibrations are emitted by the emitter in the fiberglass reinforcement plane and normal to the reinforcement plane, pulses passed in fiberglass are received by the receiver, their propagation velocities are measured in the fiberglass reinforcement plane, while the velocities of longitudinal ultrasonic waves propagating normal to the fiberglass reinforcement plane are measured, at frequencies from 2 to 20 MHz using two piezoelectric transducers coaxially located on opposite surfaces with two-way access or using one piezoelectric transducer with one-way access, after which the density of fiberglass is determined by experimentally constructed regression dependence of the density of the material on the velocity of ultrasonic waves in the normal direction, while the velocity of ultrasonic waves in the fiberglass reinforcement plane is measured at frequencies from 0.06 to 2 MHz using two piezoelectric transducers, located on opposite surfaces of fiberglass or on one of them, after which the elastic modulus of fiberglass is determined by a certain mathematical expression.

EFFECT: providing the possibility of determining the elastic modulus of fiberglass in any direction relative to the direction of fiberglass reinforcement, as well as improving the accuracy of determining the elastic modulus, relaxation in the requirements for the quality of the surface of the control object and taking into account the relaxation components of the dynamic elastic modulus with variable thickness and (or) fiberglass reinforcement scheme.

1 cl, 2 dwg