Corrosion fatigue crack detection system and use method thereof

Abstract

The invention belongs to the field of corrosion fatigue crack detection discloses a corrosion fatigue crack detection system and a use method thereof. A new crack detection method is provided by improving a loading system structure and a corrosion liquid treatment system from the perspective of methods of the loading system structure, the corrosion liquid treatment system structure and a crack detection system. A guide rail sliding block mechanism is connected with a supporting roller, so that rapid position adjustment of the supporting roller is achieved, the supporting roller is convenient to install, and the system is wide in measurement range and high in elasticity. According to the dynamic crack detection system, according to the position monitoring system, a scale and an industrial camera are adapted to perform image acquisition on a crack propagation process; a crack tip image is converted into coordinates after being subjected to image processing; and finally the coordinates are converted into a crack propagation length after being subjected to computer processing; and therefore, the reduction of detection precision caused by other factors is avoided, and non-contact measurement of the crack propagation length is realized.

Description

technical field [0001] The invention belongs to the field of corrosion fatigue crack detection, and in particular relates to a corrosion fatigue crack growth detection system, which is suitable for detecting three-point bending corrosion fatigue crack growth. Background technique [0002] As a fatigue crack detection system, the corrosion fatigue crack growth detection system is an important technical means and evaluation method in the study of crack growth. For samples of different sizes, different support rollers and different fixtures need to be designed, which takes a long time to install the fixtures. In addition, for bending samples with different loading conditions, different testing machines are required, resulting in an increase in the overall test cost. The crack detection system is the key technology for corrosion fatigue crack growth detection. Common crack detection methods include visual and non-visual methods. The visual method directly reads the crack lengt...

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Problems solved by technology

Potential method is based on the conductivity of metal components to measure cracks. In the corrosive environment, the problem of conductive insulation of system connection wires should be considered; compliance method is to use crack opening displacement to indirectly measure crack length, and use the formula to calculate, but the variables involved in the calculation formula Many, their errors will directly affect the measurement accuracy of the compliance method

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