Crack monitoring sensor based on plasma spraying, and preparation and monitoring method thereof

Abstract

The invention discloses a crack monitoring sensor based on plasma spraying, and a preparation and monitoring method thereof. The crack monitoring sensor adopts a functionally graded mosaic membrane structure integrating an insulation base layer, a damage sensing element and a packaging protection layer on the surface of a target monitoring structure with an arbitrary shape through a plasma spraying process, and the shape of the crack monitoring sensor is matched with the shape of a crack monitoring part. The damage sensing element adopts a multi-ring sensing element structure, the centers of the rings are overlapped, and adjacent rings are arranged at equal intervals, and each ring is provided with an output voltage lead. A stabilized power source is externally connected to the two ends ofa crack surface through the output voltage lead of the damage sensing element, then potential difference between the two ends of the crack surface of the target monitoring structure is measured, thecrack length of the target monitoring structure is determined through the functional relationship between the crack length and the potential difference of the target monitoring structure, and crack monitoring to dangerous parts with any shapes can be achieved.

Description

technical field [0001] The invention belongs to the technical field of crack monitoring sensor preparation, in particular to a crack monitoring sensor based on plasma spraying, a preparation method thereof, and a crack monitoring method. Background technique [0002] The damage and destruction of structures under the action of changing stress (strain) is called fatigue damage or fatigue failure. Fatigue failure is the most common failure mode of equipment and components, accounting for about 50% to 90% of all component failures. Fatigue failure is usually due to the initiation and development of cracks, and the initiation and development of cracks eventually leads to the destruction of structures. Therefore, monitoring structural cracks is an important method to understand the safety status of structures. The traditional crack monitoring method or crack sensor preparation method is to detect cracks on dangerous parts with regular shapes (such as circular hole shapes, etc.), ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a crack monitoring sensor based on plasma spraying, to solve the problem of poor durability caused by the independence of the existing sensor and target monitoring structure and the crack monitoring sensor can only carry out crack detection on dangerous parts of regular shape However, it is impossible to monitor cracks in dangerous parts of arbitrary shapes.

[0009] Another o...

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