Influence of laser shock peening parameters on the distribution of residual stresses in the edge of a titanium alloy compressor blade

The paper analyzes the influence of laser radiation parameters on alteration in the geometric parameters of the compressor blade feather edge made of titanium alloy using mathematical simulation of the laser shock peening process. The peening was performed by a laser beam with a square spot of side of 1...3 mm without overlapping the spots in a singular pass. Influence of the spot size on the peening time was assessed. Simulation included two stages. At the first stage, propagation of the elastic-plastic waves was simulated based on the Johnson-Cook constitutive relation. At the second stage, static computation of the residual stresses distribution was performed. Analysis of the number of laser spots required to peen an area with the diameter of 10?5 mm showed that with a spot size of 2...3 mm, the treatment time was significantly shorter than with the size of 1 mm. Using the laser shock peening on both sides led to elongation of the blade feather edge. With an increase in the radiation power density, the edge elongated, and the spot overlap coefficient changed the elongation curve slope. Double-support blade fastening by the lock and the middle zone ensured geometric deviations after the laser shock peening within the size tolerance. Besides, the blade could be manufactured with deviation from the geometric parameters, so that after deformation from peening, they should satisfy requirements of the design documentation.
EDN: PCLOSN, https://elibrary/pclosn

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