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A photoelastic model and its manufacturing method

A production method and photoelastic technology, applied in the field of experimental mechanics research, can solve the problem that the dimensional accuracy and internal performance of the photoelastic model cannot meet the requirements of the quantitative photoelastic test of the aeroengine, and achieve the effect of convenient operation, improved purity, and simple process

Active Publication Date: 2019-05-31
CHINA AVIATION POWER MACHINE INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the dimensional accuracy and internal performance of the photoelastic model cannot meet the requirements of the quantitative photoelastic test of the complex components of the aero-engine, and provides a dimensional error less than 0.01mm, the initial stress is close to zero, and has good optical and mechanical properties Photoelastic model and its fabrication method

Method used

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  • A photoelastic model and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for making a tenon-groove photoelastic model of an aeroengine turbine working blade, comprising the following steps:

[0053] S1 blank production: install the photoelastic model blank mold on the lifting platform of the vacuum casting machine, adjust the height of the lifting platform until it is convenient to watch the inlet and outlet of the photoelastic model blank mold through the observation window of the model forming room Until then, the flow guiding device in the vacuum mixing chamber of the vacuum casting machine is connected directly above the blank mold of the photoelastic model.

[0054] 128 epoxy resins, maleic anhydride are weighed 8kg by the mass ratio of 100:35, mix uniformly in the vacuum stirring control chamber, the model molding chamber is evacuated, the curing mold chamber is heated, when the curing mold chamber When the temperature is maintained at 60°C, the mixed solution of 128 epoxy resin and maleic anhydride flows to the feed port of t...

Embodiment 2

[0064] The difference between this embodiment and embodiment 1 is that the mass ratio of 128 epoxy resin to maleic anhydride is 100:30.

Embodiment 3

[0066] The difference between this embodiment and embodiment 1 is that the mass ratio of 128 epoxy resin to maleic anhydride is 100:33.

[0067] According to the recorded curing time and internal stress detection, the recorded results are shown in the following table:

[0068]

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Abstract

The invention relates to the field of experimental mechanics researching, and discloses a photoelastic model and a manufacturing method thereof. 128# epoxy resin and maleic anhydride are mixed under the vacuum condition according to the mass ratio being 100:(30-35) and are then injected into a photoelastic model blank die on a vacuum pouring molding machine for molding, a blank is subject to isothermal curing, the blank is taken out from the die when the exterior is cured and the interior is not cured completely, and secondary curing is carried out to obtain a workblank; the edge of the workblank obtained in the step one is cut to be removed, the cutting temperature does not exceed 80 DEG C, and corresponding machine finishing is carried out according to the model structural design to obtain a model, wherein the machine finishing temperature does not exceed 80 DEG C; and the model obtained in the step two is polished to obtain the photoelastic model. The manufacturing method of the photoelastic model is simple in process, the obtained model is high in quality, the internal stress is close to zero, the external size error is smaller than 0.01 mm, and the photoelastic test accuracy is better improved.

Description

technical field [0001] The invention relates to the field of experimental mechanics research, in particular to a photoelastic model and a manufacturing method thereof. Background technique [0002] Photoelasticity test technology has played an important role in various stages of the development of finalized aero-engines, and is an important means of strength analysis of complex components of aero-engines. However, as the countries with advanced aviation technology in the world are looking for low-risk technical ideas that can save research and development funds and shorten the development cycle, and adopt the technical approaches developed at the stage of core aircraft, technology verification aircraft and prototype aircraft, the original photoelasticity The test technology is no longer suitable for the development of new types of aero-engines. The aviation industry has creatively developed the photoelastic test technology itself to meet the new requirements constantly rais...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C39/02B29C39/22B29C39/42
CPCB29C39/02B29C39/22B29C39/42
Inventor 郭天才徐友良文华高俊廖学军
Owner CHINA AVIATION POWER MACHINE INST
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