研究目的
Investigation the effect of laser ablation parameters in a liquid in order to reduce the pulse energy during laser shock peening.
研究成果
An increase in the effect of LSP with increasing spot diameter and constant intensity was analyzed from the point of view of changing loading conditions. The final value of residual stresses was calculated as a superposition of stress states formed by shock waves from elementary sections exposed to laser ablation. The results of the study of the incident angle influence and the state of the surface on the laser ablation process in a liquid showed that the final pressure of the shock wave depends on how much laser energy is absorbed by the material and then ablated.
研究不足
The study focused on pure nickel and may not be directly applicable to other materials. The range of spots near 200 μm is of more interest, which may limit the generalizability of the findings to other spot sizes.
1：Experimental Design and Method Selection:
The study involved laser shock peening (LSP) technology, focusing on the physical processes during and after laser treatment. The effect of laser parameters on the process results was investigated using a standard model for the LSP process.
2：Sample Selection and Data Sources:
Pure nickel (nickel content over 99.5%) was chosen for research. The surface was polished before processing to ensure tight contact of the ablation coating with the surface.
3：5%) was chosen for research. The surface was polished before processing to ensure tight contact of the ablation coating with the surface.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Solar LS LQ-829 solid-state Nd:YAG laser with a wavelength of 532 nm, pulse duration of 20 ns, and pulse energy of up to 1 J was used for irradiation. Aluminum foil was used as an ablative layer, and water layer as a transparent medium.
4：Experimental Procedures and Operational Workflow:
The nickel samples were coated by aluminum foil before LSP. Water layer was used as a transparent medium. The radiation was directed to the sample using a reflecting mirror and then focused. Photofixation of the laser ablation process was carried out using a Canon EOS 650D camera.
5：Data Analysis Methods:
The influence of the LSP parameters on the process dynamics was determined by calculating the profile of the residual voltage arising in it, after exposure to pulses. The relationship of these parameters with the efficiency of the laser ablation process and the features of the plastic deformation passing were also determined.
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