Nondestructive detection system and method for small-sized component surface layer micro-cracks

Abstract

The invention discloses a nondestructive detection system for small-sized component surface layer micro-cracks. The nondestructive detection system comprises an upper computer system, a dynamic strain meter, a strain gauge, a vibrating table, a power amplifier, an arbitrary waveform generation card, a charge amplifier, an acceleration sensor and an oscilloscope, and the upper computer system comprises a strain waveform reading module, a strain identification module, a voltage waveform reading module, a voltage identification module and a vibration level conversion module. A nondestructive detection method for the small-sized component surface layer micro-cracks includes the steps: clamping a small-sized component onto an excitation vibration table top of a motion component of the vibrating table; firstly acquiring a modal peak value of an unmachined small-sized component by the upper computer system; secondly acquiring a modal peak value of a machined small-sized component by the upper computer system. If the acquired modal peak values are unequal under two conditions, namely, the surface layer of the small-sized component generates the micro-cracks. The nondestructive detection system has the advantage of capability of rapidly and accurately determining whether the micro-cracks are generated on the surface layer of the small-sized component or not.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a non-destructive testing system and method for microscopic cracks on the surface of small-sized components. technical background [0002] With the rapid development of micro-nano manufacturing technology, small-sized components have been widely used in the field of mechanical engineering. However, small-sized components will be affected by various external factors during the manufacturing process, which will cause microscopic cracks to be introduced into the surface of small-sized components. , which seriously restricts the improvement of the quality of small-sized components, so it is necessary to detect small-sized components to determine whether there are microscopic cracks on the surface of small-sized components, which is of great significance to the subsequent application of small-sized components. The currently widely used microscopic crack detection metho...

AI Technical Summary

Problems solved by technology

Acoustic emission testing technology belongs to non-destructive testing technology, which can carry out non-destructive testing on small-sized components. However, in actual testing, acoustic emission signals are usually relatively weak and are easily interfered by external factors, which reduces the accuracy of testing.

Ultrasonic testing technology is also a non-destructive testing technology, which can perform non-destructive testing on small-sized components. However, ultrasonic testing technology is not sensitive to microscopic cracks caused by early fatigue damage of materials, which reduces the accuracy of testing.

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