Uniaxial loading of a cylindrical working section to achieve a biaxial stress state test piece

Abstract

A test piece of biaxial stress state achieved by uniaxial loading of a cylindrical working section. The whole is a plate structure, the middle part is the working section, the left and right sides are clamping sections, the working section is a diamond structure, and the parts on both sides of the two diagonal lines symmetry. The working section is designed with cylindrical grooves and special-shaped holes; among them, the cylindrical grooves are designed on the front and back of the working section, and are designed diagonally along the upper and lower directions of the working section; there are four special-shaped holes, which are respectively opened in the working section by two On the four parts equally divided by the angle bisector. The loading of the test piece is realized by the uniaxial fatigue testing machine. Under the designed cylindrical groove and special-shaped hole, a multiaxial stress state of horizontal tension and vertical compression is finally generated in the center of the whole test piece, forming a typical Tension / compression multiaxial stress state. The invention can realize the simulation of the tension and compression biaxial state at the center of the turbine disk, can partially replace the component-level assessment test, shorten the structural design cycle, and save the test cost.

Description

technical field [0001] The present invention aims at the typical stressed state of typical structures such as blades, discs, and shafts of turbomachinery, and designs a test piece structure that can reflect the structural stress characteristics, which belongs to the technical field of mechanical structure strength assessment and simulation piece design, and is specifically a kind of The biaxial stress state test piece is realized for the uniaxial loading of the cylindrical working section. Background technique [0002] At present, in typical structures of turbomachinery blades, discs, shafts, etc., including aeroengines and internal combustion engines, stress concentration locations such as hole edges and fillets are key parts that are prone to fatigue cracks and subsequent damage. In order to ensure the safety of these positions, it is usually necessary to carry out strength assessment through tests, especially fatigue strength assessment. For components, it is undoubtedly...

AI Technical Summary

Problems solved by technology

[0004] For the designed multi-axial fatigue test piece, the test is usually carried out on a multi-axial fatigue testing machine, which brings another difficulty in the research process, that is, the way of applying the load is greatly restricted

Using a multi-axial fatigue testing machine to load, the test cost is also high, and the load is usually a tensile torsion load, which is more limited

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