Experimental Study on Overspeed Prestressing of High Pressure Turbine Disk of Gas Turbine
In order to reduce the service stress of the turbine disk,and improve the service life and relia-bility of the turbine disk,the overspeed prestressing test was carried out on a turbine disk test piece with-out removing the stress in machining process,and the residual stress was tested on the disk test piece be-fore and after the test.The results show that overspeed prestressing test can prefabricate the residual com-pressive stress of the key part of the disk(disk core),and the error of the calculated residual circumfer-ential stress is 9.2%compared with the measured value;the overspeed prestressing test can reduce the residual stress on the surface of the disk,and the residual circumferential stress decreases by the maxi-mum of 58%compared with that before the test;the overspeed prestressing test can improve the service life of the disk,and the life prediction can be doubled compared with that before the test.
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