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High-temperature fatigue test clamp and method capable of continuously adjusting blade check section stress distribution

A stress distribution and fatigue test technology, applied in the direction of elasticity test, machine/structural component test, analysis of materials, etc., can solve the problem of discontinuous adjustment amount, etc., to achieve the effect of repeated disassembly and reliable loading

Active Publication Date: 2017-05-10
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fixture needs to be disassembled every time it is adjusted, and the adjustment amount is discontinuous, which is an integer multiple of the thickness of the gasket

Method used

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  • High-temperature fatigue test clamp and method capable of continuously adjusting blade check section stress distribution
  • High-temperature fatigue test clamp and method capable of continuously adjusting blade check section stress distribution
  • High-temperature fatigue test clamp and method capable of continuously adjusting blade check section stress distribution

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Embodiment Construction

[0038] The present invention is a high-temperature fatigue test fixture that can continuously adjust the stress distribution of blade assessment section, and its specific implementation is as follows:

[0039] High temperature fatigue test fixture such as figure 1 , figure 2Shown, by lower chuck 1, lower fork 4, wheel disc approximation part 15, front baffle 5, rear baffle 17, blade combined fixture 7, last fork 9, upper chuck 11, 2 long pins (2, 8), 2 short pins (12, 19), 16 adjusting bolts (3, 10, 13, 18, four for each), 16 springs (3, 10, 13, 18, each Four), 6 long bolts (5,14, wherein 5 places two, 14 places have four) to form. Wherein, the upper chuck 11 and the lower chuck 1 are respectively fixed on the upper and lower clamps of the tensile fatigue testing machine. In order to facilitate the reliable transmission of mechanical loads, the blade combination fixture 7 is a half-step rectangular sheet structure with an inner hole 21 and a counterbore 22, such as image...

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Abstract

The invention relates to a high-temperature fatigue test clamp and method capable of continuously adjusting check section stress distribution of a blade. According to the high-temperature fatigue test clamp, upper and lower chucks are arranged on a fatigue testing machine, and the blade is fixed on the testing machine through a fork, a wheel disc similar part and a blade combined clamp. The test clamp comprises four joints; bolts at two sides of each joint are adjusted and an included angle between the blade and a main axis of the testing machine can be continuously adjusted, so that eccentric stretching of the blade is realized. In combination of adjustment of a stretching load of the fatigue testing machine, simulation of a check section working stress field of a turbine blade can be realized. Furthermore, each adjusting bolt sleeves a pressing spring and the fastening length of each bolt keeps constant through the restoring force of the springs after detachment, so that repeated adjustment is avoided.

Description

technical field [0001] The invention belongs to the technical field of aerospace engines, and in particular relates to a high-temperature fatigue test fixture and method capable of continuously adjusting the stress distribution of a blade examination section. Background technique [0002] Aeroengine turbine blades are one of the most important parts of the engine, and high-temperature fatigue failure is its main failure mode. Therefore, high-temperature fatigue tests for this type of blades are required to determine their safe service life. However, a key issue in fatigue life testing of turbine blades is to simulate the mechanical loads experienced by the blades during their service. [0003] Under laboratory conditions, turbine blades are usually loaded using a tensile fatigue testing machine. The tensile load provided by the fatigue testing machine is a concentrated force, and only a uniform stress field can be generated on a plane perpendicular to the load. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/04G01M5/00
CPCG01M5/0016G01N3/04
Inventor 胡殿印王荣桥刘辉刘茜蒋康河
Owner BEIHANG UNIV
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