Photosensitive resin-based surface crack detecting method for complex structure

Abstract

The invention provides a photosensitive resin-based surface crack detecting method for a complex structure. The photosensitive resin-based surface crack detecting method is characterized in that a for the complex structure with surface cracks, a light-shading injector is utilized for spraying liquid-state photosensitive resin to the positions of the surface cracks; when spraying is performed, a hand-held type ultraviolet light source is used for irradiating the photosensitive resin, and the liquid-state photosensitive resin is gradually cured into solid; surface crack length, surface crack shape and the like of the complex structure are copied; the cured photosensitive resin is stripped off from the surface of the structure, is put under an optical microscope or a scanning electron microscope to precisely measure the crack length and observe the crack shape, so that a safety state of the structure is accessed. The surface crack detecting method is simple to operate, can be used for precisely and quickly detecting cracks on the surfaces of complex structures such as a gas turbine engine blade, a pressure container, a car housing and a building, and solves the problems that detection is not liable to perform on the production and working sites or detection cannot be performed on the production and working sites.

Description

technical field [0001] The invention belongs to the technical field of crack detection, and in particular relates to a detection method and reproduction method for surface cracks of complex structures based on photosensitive resin. Background technique [0002] Statistics show that structural failures caused by fatigue and fracture account for about 80% of current structural failures. In equipment such as aero-engines, fatigue and fracture failures may also lead to major accidents such as aircraft crashes and fatalities. Crack detection of structures in service can detect dangerous cracks in the structure in time, determine the length of cracks, and then repair or replace them. However, ultrasonic testing, fluorescence testing and other methods currently used have limited detection accuracy and are difficult to detect the three-dimensional size of cracks, especially for structures with complex surface structures, such as aeroengine blades, pressure vessels, and automobile s...

AI Technical Summary

Problems solved by technology

[0003] Problems solved by the technology of the present invention: Aiming at the current problem that the surface cracks of complex structures are difficult to be accurately detected, a method for detecting surface cracks of complex structures based on photosensitive resin is provided, which is easy to operate and can accurately and quickly detect gas turbine engine blades, pressure vessels, automobiles, etc. Cracks on the surface of complex structures such as shells and buildings can solve the problems that are difficult or impossible to detect in production and work sites

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