GB/T 38537-2020Ultrasonic testing method for fiber reinforced resin matrix composites—C-scan method (English PDF)

1 Scope

This standard specifies the method principle, general requirements, imaging system, test block, coupling of fiber reinforced resin matrix composite ultrasonic

Mixtures, testing procedures, result evaluation, recording and reporting.

This standard applies to carbon fiber and glass fiber and other fiber-reinforced resin matrix composite products (hereinafter referred to as the test piece) layering, air holes

Ultrasonic C-scan detection of defects.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article

Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.

GB/T 19799.1 Non-destructive testing Ultrasonic testing No. 1 calibration test block

GB/T 27664.1 Performance and inspection of ultrasonic testing equipment for nondestructive testing Part 1. Instruments

GB/T 34892 Non-destructive testing Ultrasonic testing method of manipulator

3 Method principle

The most commonly used ultrasonic C-scan methods are contact ultrasonic pulse reflection method, water immersion ultrasonic pulse reflection method and water jet ultrasonic pulse penetration law. The contact and water immersion ultrasonic pulse reflection method is based on the reflection echo or

Changes in the amplitude, phase, and propagation time of the bottom echo generated by the bottom surface of the material to evaluate the quality of the material; water jet ultrasonic pulse penetration method

Place the transmitting probe and the receiving probe on both sides of the test piece, and the ultrasonic wave is transmitted by one probe and passes through the test piece into the other probe.

According to the change of transmitted wave intensity, the quality of the material is evaluated.

4 General requirements