Experimental verification device of crack growth service life of wheel disc

Abstract

The invention relates to an experimental verification device of a crack growth service life of a wheel disc, and belongs to the technical field of experimental verification of crack growth of the wheel disc. The problem that the conventional double-pull-rod experimental device cannot ensure that the stress and the included angle between two pull rods in a loading process and can only perform a single mortise stress verification test is solved. A wheel disc sub-model is fixedly mounted on a work table of an MTS testing machine through a wheel disc fixture, tooth-shaped loading blocks are mounted in three mortises in an upper end of the wheel disc sub-model, U-shaped shackles are hinged to the upper ends of the tooth-shaped loading blocks, fixing frames are symmetrically mounted on upright posts on the two sides of the MTS testing machine through flanges, second fixed pulleys are arranged at the centers of free ends of the fixing frames, first fixed pulleys are arranged above and below the second fixed pulleys, and the upper end of a wire rope fixing seat is connected with an output end of the MTS testing machine. The experimental verification device of the crack growth service lifeof the wheel disc avoids stress errors of the mortises; and the starting ends of the three wire ropes are synchronously stretched to ensure the equal stress of the wire ropes.

Description

technical field [0001] The invention relates to a verification device, in particular to an experimental verification device for crack extension life of a roulette, and belongs to the technical field of experimental verification of crack extension of a roulette. Background technique [0002] One of the important criteria for the design of gas turbine discs is to have sufficient crack growth life. Although the fracture mechanical properties of materials and theoretical calculation of life are important steps in life prediction, the structural factors, cold and hot processing conditions, surface conditions and other factors of the wheel are not fully considered. Therefore, it is necessary to carry out tests on the crack growth life of the disc to verify the accuracy of the crack growth life prediction. [0003] The experimental verification device of the existing wheel sub-model is a double tie rod structure, and the tie rods are required to have a sufficiently long size. The ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an experimental verification device for the crack extension life of the wheel disc, so as to solve the problem that the traditional double tie rod experimental device cannot guarantee the same force on the two tie rods during the loading process, and can only carry out a single tenon groove stress verification test question

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