Method for detecting and monitoring cracks of mechanical parts by utilizing fluorescent quantum dots

Abstract

The invention discloses a method for detecting and monitoring cracks of mechanical parts by utilizing fluorescent quantum dots, and relates to material detection and analysis by utilizing optical methods. The method comprises the following steps: preparing solidifiable quantum dot film forming resin; solidifying at a part to be detected to form a fluorescent quantum dot resin coated film; carrying out a tensile test on a metal CT (Compact Tensile) specimen coated with quantum dot resin coated film to obtain fluorescence spectrum sample data; irradiating the fluorescent quantum dot resin coated film at the part to be detected by using an excitation light source, monitoring whether fatigue cracks occur at the part to be detected or not, and collecting and storing fluorescence spectrum historical data; if the fatigue cracks occur at the part to be detected, determining the width of cracks, and sending safety pre-warning. By detecting the quantum dot resin coated film solidified on a monitored mechanical part, the method disclosed by the invention has the advantages that tiny fatigue cracks on the mechanical part in an early stage can be discovered, the detection precision is high, the cost is low, influence caused by the appearance of a detected component can be avoided, dangerous parts of important mechanical parts can be subjected to real-time safety monitoring, and the application range is wide.

Description

Technical field [0001] The invention relates to material detection and analysis using optical means, and in particular to a method for detecting and monitoring cracks in mechanical parts by using fluorescent quantum dots. Background technique [0002] In mechanical engineering, equipment is operated for a long time, and its components will produce micro-small cracks under the action of mechanical force, causing great safety hazards to the equipment. Real-time health monitoring of dangerous parts of key components is of great significance for ensuring the safety of personnel and equipment. [0003] In engineering, the commonly used nondestructive crack detection technologies include magnetic particle testing, ultrasonic testing, radiographic testing, penetrant testing, etc. The above detection technologies have high sensitivity, but most of the accuracy can only reach 0.3-0.4mm. Penetration detection accuracy can reach 1μm, but the width of the crack cannot be directly described. F...

AI Technical Summary

Problems solved by technology

However, the method of this invention is only suitable for the detection of workpiece welding quality and existing defects, and cannot be used for real-time safety monitoring of dangerous parts of important components

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