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

Abstract

The invention discloses a biaxial stress state test piece realized by uniaxial loading of a spherical working section. The lateral parts are symmetrical. There are spherical depressions and special-shaped holes designed on the working section; among them, the spherical depressions are designed on the front and back of the working section, located in the center of the working section; there are four special-shaped holes, which are respectively opened on the working section by its two angle bisectors on the four equally divided parts. The loading of the test piece is realized by a uniaxial fatigue testing machine. Under the designed spherical depression and special-shaped hole, a multiaxial stress state of horizontal tension and vertical compression is finally generated in the center of the entire 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 period, and save the test cost.

Description

technical field [0001] The invention belongs to the technical field of mechanical structure strength assessment and simulation part design, and is a test piece aimed at the uniaxial loading of the spherical working section to realize the biaxial stress state. The force state can reflect the stress characteristics of the structure. 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 a long cycle and high cost to carry out component-level tests for overall structural assessment. At the same time, there are many uncontrollable factors in the t...

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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