A New Method for Photoelasticity Test in Inhomogeneous Media
A technology of non-uniform medium and new method, applied in the field of experimental mechanics, to achieve the effect of reducing size difference, simple test method and easy realization
Active Publication Date: 2015-12-30
SUN YAT SEN UNIV
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to provide a new method for inhomogeneous medium photoelasticity test, a new method to solve the needs of indoor photoelasticity test for inhomogeneous material
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment example
[0025] A new method of inhomogeneous medium photoelasticity test is realized through the following steps:
[0026] 1. Model box production. The model box is composed of perforated L-shaped stainless steel plate F3, perforated rubber sheet F2, perforated tempered glass F1 and screws F4. The hole size and pitch correspond one-to-one. Then assemble.
[0027] 2. Apply release agent
[0028] The release agent was obtained by mixing extrusion-grade polystyrene and toluene, letting it stand for 72 hours, and then filtering. Soak the whole model in the release agent by soaking method. Then take it out and let it air dry.
[0029] 3. Make a plate model.
[0030] (1) Pour the epoxy resin into a large beaker, and then put the beaker into a 100°C water bath and boil for one hour, stirring constantly to volatilize impurities and precipitate slag.
[0031] (2) Pour the curing agent into a beaker and fully melt it in a water bath at about 80°C.
[0032] (3) Put the epoxy resin and cu...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a novel photoelastic testing method for an inhomogeneous medium. The novel photoelastic testing method comprises the following steps: manufacturing a model box, applying a demoulding agent, manufacturing a plate-like model, cutting into particle models, filling and bonding the models, loading, and shooting and processing an image; the method is characterized in that the model box consists of a steel plate, high-temperature-resistant rubber, toughened glass and screws; the particle models are produced by a bench drill and a hollow drill bit; a model filling and bonding material is selected based on a similarity principle; automatic and manual quick change of the color of a surface light source can be achieved; post-processing software can automatically screen stress cloud pictures obtained under light sources with different colors, and can automatically process the stress cloud pictures to obtain a stress grade change curve. The novel photoelastic testing method has the main advantages as follows: based on optics and a model similarity principle, the structure is simple and the novel photoelastic testing method is easy to implement; the stress distribution and the evolution condition of the inhomogeneous medium can be obtained; the injection-moulding and loading are performed by adopting the same set of equipment, so that the material is saved, the cost is lowered and the error is reduced; and the light sources can be switched fast, so that the stress cloud pictures under different light sources can be obtained at the same time.
Description
technical field [0001] The invention belongs to the field of experimental mechanics, and in particular relates to a new laboratory test method for photoelasticity test of inhomogeneous media. technical background [0002] Photoelasticity test is an experimental method for stress measurement using the wave properties of light (polarization, birefringence, interference, diffraction, etc.), which belongs to the traditional test of mechanics. Some polymer materials (epoxy resin, polycarbonate, etc.) have a temporary birefringence effect, which makes a model geometrically similar to the shape and size of the real object, and applies a load similar to the real object to the model, in a specific polarized light field Observe that stress-related interference fringes appear in the model. According to the principle of photoelasticity, the stress magnitude and direction of each point in the model can be calculated, and the stress of the real object can be converted according to the si...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/24
Inventor 周翠英李伟科李拔通
Owner SUN YAT SEN UNIV