Double-head tenon joint tension test structure without additional bending moment

Abstract

The invention discloses a double-head tenon joint tension test structure without an additional bending moment. The test structure consists of a blade test piece (1), clamps (2), pins (3) and stress pieces (4). During test, tenons at two ends of the blade test piece (1) are clamped into mortises of the clamps (2), the clamps (2) are connected with the stress pieces (4) at two ends through the pins (3), and the two pins (3) are respectively vertical to the axis of the blade test piece (1) and mutually orthogonally distributed. The test structure is simple in structure and scientific in design, can be widely applied to tests on tensile static strength, fatigue, durability, creep deformation, vibration and the like of blades (containing tenons and mortises) in impeller machinery, and can be used for solving the problems of high design and machining difficulty of test clamps, generation of additional bending moment and low test efficiency in blade test. The test structure has the advantages of good practical value and good application prospect in the field of aerospace propulsion.

Description

(1) Technical field [0001] The invention provides a double-tenon joint tensile test structure without additional bending moment, which belongs to the technical field of aviation propulsion. (2) Background technology [0002] The tenon joint structure is a structure often used in power equipment such as aero-engines and ground gas turbines, and is a common way to fix blades on the wheel. [0003] Due to its complex structure and complex contact, the mortise and tenon joint structure has to bear the centrifugal tensile load, aerodynamic load and thermal load of the blade, and may also bear the vibration load, so it belongs to the large force and complex stress state in the blade / disc structure. , key parts that are prone to failure, it is necessary to use a large number of tests to predict or verify the stress level and life of the tenon joint parts; at the same time, when testing and verifying the stress state and life test of the blade body, it is also necessary to use the t...

AI Technical Summary

Problems solved by technology

[0010] 1. Purpose: The purpose of the present invention is to provide a double-tenon joint tensile test structure without additional bending moment, which can be widely used in the tensile static strength, fatigue and durability of blades (including tenon and tenon) in turbomachinery. , creep, vibration and other tests, which solve the problems of difficult design and processing of test fixtures, additional bending moments and low test efficiency in blade tests

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