Laser shock peening defect online detection method based on acoustic emission dual-channel range

Abstract

The invention discloses a laser shock peening defect on-line detection method based on acoustic emission dual-channel range, the combination of a laser shock peening process and a defect detection process is realized, an acoustic emission technology is adopted by a defect on-line detection system, tiny defects in a plate can be more clearly detected, and in addition, the acoustic emission signal is generated by deformation of the material during laser shock peening, an external excitation source is not needed, and the information utilization rate of laser shock peening is improved. After propagation analysis of the acoustic emission signals in the plate, range fusion is carried out on sensor signals at different positions, so that fused signal features can represent defect information more completely and clearly, and the accuracy of defect detection is improved. The method provided by the invention is simple in algorithm, high in feature distinction degree, easy to explain, high in robustness and high in engineering applicability, and provides an effective implementation way for defect online detection in the laser shock peening process.

Description

technical field [0001] The invention belongs to the field of laser shock strengthening, and in particular relates to an online detection method for laser shock strengthening defects based on acoustic emission dual-channel range. Background technique [0002] Laser shock strengthening is a new surface treatment technology that uses shock waves induced by high-energy pulsed lasers to strengthen metal materials. The technical principle is that the high-energy pulsed laser passes through the transparent constrained layer and irradiates the metal coated with the absorbing protective layer. Propagate high-pressure shock waves to modify the surface of the material, thereby strengthening the physical and chemical properties of the metal material. Compared with other traditional surface treatment processes, laser shock peening has the characteristics of good controllability and obvious strengthening effect. [0003] In actual engineering, for non-defective plates, laser shock stren...

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Problems solved by technology

[0005] In the above published or authorized patents, the detection methods proposed require a separate excitation device for material defect detection, which cannot be detected in real time during LSP processing

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