An Ultrasonic Testing Method for Adhesive Quality

Abstract

The invention provides an ultrasonic detection method of the bonding quality, which is realized through the following steps: Step 1. Before the composite material blade is bonded with metal wrapping, use ultrasonic water spray to penetrate the C-scan method at the leading edge. Detect and exclude defective composite material blades at the leading edge; step 2, after the composite material blades with no defects at the leading edge are bonded to the metal wrapping, use ultrasonic water spray to penetrate the C-scan method to detect the edge wrapping of the blade to determine Mark the horizontal position of the sticky defect; step 3, use a high-resolution delay block probe to detect the above-mentioned mark from the front and back sides, and use the height of the reflected ultrasonic pulse composed of the composite material / metal / air interface wave on the opposite side to determine Determine which surface the disbonding defect occurs on. The method of the invention can quickly and accurately detect the debonding defect of the metal wrapping of the component not larger than Φ5mm, and can accurately determine which surface the debonding occurs on, thereby meeting the requirements of product design and repair.

Description

technical field [0001] The invention relates to an ultrasonic detection method for bonding quality, in particular to an ultrasonic detection method for the bonding quality of a resin-based composite blade leading edge and a small-thickness metal wrapping, and belongs to the field of ultrasonic nondestructive testing. Background technique [0002] New engine blades have begun to use a new structure of fiber-reinforced resin-based composite materials bonded with small-thickness metal wrapping to replace pure metal blades, which can greatly reduce the weight of the blades. However, the hemming in this structure will be washed by high temperature and high-speed airflow during use. If the bonding quality is not good, the hemming will fall off and enter the engine, causing major accidents. Therefore, effective nondestructive testing technology must be used to detect it. Check the bonding quality. [0003] In the above blade structure, the thickness of the metal wrapping is ≤0.3 m...

AI Technical Summary

Problems solved by technology

At present, ultrasonic testing is a commonly used non-destructive testing method. However, when the conventional ultrasonic testing method is used to test the bonding quality of the above structure, due to the particularity of the above structure (such as irregular and thin wrapping, inconsistent thickness of the leading edge of the blade, etc.) ), there will be the following problems: the metal wrapping is difficult to distinguish, the irregular shape of the wrapping is difficult to couple, the debonding of the wrapping is difficult to distinguish from the defects in the leading edge of the composite blade, and it is difficult to determine which side of the debonding occurs, which seriously affects the test results

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