Photoelastic model capable of self-generating interference fringes
A technology of interference fringes and models, which is applied to teaching models, measurement of the change force of the optical properties of materials when they are stressed, instruments, etc., to achieve the effects of saving equipment investment, being easy to carry, and being easy to carry
Inactive Publication Date: 2009-12-02
XUZHOU UNIV OF TECH
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But there is a problem: to generate interference fringes on this common model, a set such as figure 1 The complex optical system necessary to generate the interference fringes shown
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[0010] Such as figure 2 As shown, the photoelastic model that can generate interference fringes by itself consists of a model specimen 1 and a polarizing film 2 pasted on the front and rear surfaces of the model specimen 1 with transparent glue 3 . The model test piece 1 is made of polycarbonate material according to the actual shape of the force-bearing object, which is the same or similar to the shape of the force-bearing object; the size of the model test piece is enlarged or reduced in proportion to each direction according to the experimental conditions; the transparent glue is preferably epoxy resin glue. The polarizing film 2 is tightly pasted on the front and rear sides of the model test piece with epoxy glue, and the test can be carried out after the epoxy resin is completely cured. According to the experimental results, the thickness of the polarizing film can produce better interference fringes between 0.04 mm and 0.40 mm, and 0.20 mm is used in this embodiment. ...
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Abstract
The invention discloses a photoelastic model used in the field of optical testing, and in particular relates to a photoelastic model capable of self-generating interference fringes, which comprises a model test-piece which is made of a polycarbonate material in the same or similar shape of a stressed object according to the actual shape of the stressed object; and polarizer film layers are closely attached on front and back sides of the model test-piece. The photoelastic model has the advantages that: the model test-piece can save complicated and large light path systems such as polariscopes, glass slides and the like of the conventional photoelastic instrument, so that the photoelastic instrument is miniaturized and convenient to carry, and the equipment investment is saved; in particular, when stress change is observed, even certain external force is applied on the model manually under the sun light, the change of the interference fringes can be observed on the model, so the photoelastic model is particularly suitable for teachers to intuitionally show students stress distribution of a symmetrical structure and mechanism concepts such as saint venant principle, stress concentration and the like, makes the students 'see stress strain', is intuitional and vivid, convenient for lecture teachers to carry, and really realizes that a libratory is brought into a classroom.
Description
technical field [0001] The invention relates to a photoelastic model used in the field of optical testing. Specifically, it is a photoelastic model that can generate interference fringes by itself. It is a model specimen used in optical stress testing. Background technique [0002] Photoelasticity is an optical stress measurement method. It uses a transparent material with birefringence to make a model similar to the actual engineering structure, component or part geometry, and applies a load similar to the actual component on the model, and calculates the boundary and internal parameters of the model based on the photoelastic stripes. The stress of the point is converted into the stress on the actual engineering structure, component or part according to the similarity theory. But there is a problem: to generate interference fringes on this common model, a set such as figure 1 The complex optical system necessary to generate interference fringes is shown. In the figure,...
Claims
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IPC IPC(8): G09B23/10G01L1/24
Inventor 张志军曹露春
Owner XUZHOU UNIV OF TECH