Coupling agent for eliminating end face roughness influence and improving vertical and horizontal wave testing effect

Abstract

The invention discloses a coupling agent for eliminating an end face roughness influence and improving a vertical and horizontal wave testing effect. According to the coupling agent disclosed by the invention, low-cost and easily available materials such as gypsum, calcined gypsum, polyvinyl alcohol, white emulsion, calcium oxide and magnesium chloride are prepared into a powdery material according to a certain procedure, and the powdery material is stored in a sealing bag for later use; when in use, the powdery material is mixed with water, stirred fully and coated on the surface of a to-be-tested object; and an ultrasonic probe is mounted for carrying out an ultrasonic test. The coupling agent is in a flow-plastics state in an ultrasonic testing pretreating stage, and can fully fill in a gap between the probe and the end face of the to-be-tested object so as to eliminate the influence of the end face roughness on the ultrasonic testing. The coupling agent is in a hard-plastics state during an ultrasonic test and has a proper adhering strength to ensure that the ultrasonic probe and the to-be-tested object are adhered into a whole, thereby obtaining a better vertical / horizontal wave testing effect. Meanwhile, according to the coupling agent, reaction mass of each materials can be calculated through a chemical reaction equation so that the coupling agent is close to neutrality and the corrosion to the to-be-tested object and the probe is reduced.

Description

technical field [0001] The invention relates to the field of ultrasonic testing such as detection and flaw detection of rocks, concrete, and steel structures, and in particular to a coupling agent that eliminates the influence of end surface roughness and improves the test effect of longitudinal and transverse waves. Background technique [0002] As one of the main exploration methods of geophysical exploration, ultrasonic detection technology is widely used in rock mass engineering property identification, integrity judgment, coal field and oil field exploration and other fields. At the same time, ultrasonic detection technology is also widely used in industrial and civil construction industries, such as non-destructive testing of concrete, steel structures and other materials. However, ultrasonic waves cannot penetrate the air between the ultrasonic probe and the measured object, so the transducer and the measured object must be protected by coupling. At present, the use ...

AI Technical Summary

Problems solved by technology

Although these liquid couplants can pass through longitudinal waves, they cannot pass through shear waves; while solid couplants are poorly coupled under low stress conditions

In addition, the acoustic wave test has high requirements on the flatness of the end surface of the measured object, which cannot be widely applied to the test of different end surface roughness

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