ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Compressor rotor blade is one of the critical parts of aero-engine. Because of thecomplex structure and bad work environment, it often went wrong. More over, the trouble of bladecan result in serious accident of engine even the aircraft. But the conventional shot peeningstrengthen method couldn’t take ideal effect, so a new method, laser shock peening on aero-enginecompressor rotor blade was studied in this paper. The principle of laser shock peening strengtheningwas presented first, and the appropriate shock parameters of a certain type blade are fixed on bymodeling. The parameters were as follows: laser pulse width is 20ns, output energy is 25J, the spotdiameter is 8mm, and peak value is at GW level, and the laser peak value power is bigger thanmaterial dynamic yield intensity. Based on these parameters, an experiment was performed byshocking the blade through a repeated Nd: glass LASER supplied by Jiangsu University. Throughcontrastive performance test, an analysis on the high frequency fatigue life and surface rigidity ofthe blade fore and after laser shock was performed. The result was concluded that laser shockpeening can significantly increase the high frequency fatigue life of aero-engine compressor rotorblade, and enhance the surface rigidity to increase the performance of contuse resistance. At last thereasons were analyzed from two aspects: laser shock can impart compressive residual stress onblade and reduce the size of crystal grain. Surface compressive residual stress can change the bladedistribution of load when working; and reduce the size of crystal grain can bring in more crystalinterface, for the more interface the crystal has the higher dislocation moving resistance and yieldstress is produced
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.404.pdf
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