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Method for testing Young modulus

A test method, Young's modulus technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of complex test system and poor repeatability, and achieve the effect of simple measurement process

Active Publication Date: 2010-06-02
GUOGUANG ELECTRIC +2
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Problems solved by technology

[0002] For the measurement of the elastic modulus of most metal materials, the strain resistance sheet is attached on the surface of the material, the deformation of the material is measured by applying a load and the resistance change of the resistance sheet, and the Yang of the material is calculated by the deformation amount and the load. Some people have applied this method to the Young's modulus test of materials used in loudspeaker vibration parts. There is a big difference, such as the Young's modulus of ordinary carbon steel is about 200GPa, the Young's modulus of copper and its alloys is 72-128GPa, and the materials used for the vibration parts of the speaker are mainly paper, plastic, rubber, and impregnated textiles. etc. The Young's modulus of these materials ranges from 0.001 to 10GPa, which is far from the Young's modulus of commonly used metal materials. The typical method of attaching strain gauges cannot be used on these materials. The method is "one-time" for the paper sheet, the repeatability is very poor, and it is not convincing enough. Therefore, some people explore the method of vibration to calculate the Young's modulus of the material by measuring the eigenfrequency of the sample. However, the Poisson's ratio used in the calculation formula needs to be given artificially (unreasonable point), because Poisson's ratio, like Young's modulus, is also an inherent elastic constant of the material, and each material has its own inherent value. This parameter also needs to be measured to be reasonable, and should not be given artificially. Secondly, the entire test system is relatively complicated. Therefore, there has not been a relatively well-founded and accurate test method for the Young's modulus test method of the speaker vibration part material. method

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  • Method for testing Young modulus

Examples

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Embodiment 1

[0056] Such as figure 1 , 2 , Shown in 5, 6, a kind of testing method of Young's modulus, at first intercept a section of elongated spline 1 in flat material, and measure the length, width, thickness, weight of spline 1; Reuse The projector measures the deflection 3 at the end of the spline 1; finally, the Young's modulus of the spline 1 is calculated according to the deflection calculation formula.

[0057] The preparation of spline 1: firstly, cut the width of 10mm on the flat material, and the length is between 30-130mm. The length of spline 1 in this embodiment is 70mm, and 20mm is the necessary length required for clamping spline 1. The remaining 50mm is the length of the cantilever, and then conduct a preliminary test. If the displacement at the end of spline 1 is between 1 and 10mm, it can be considered that the length of spline 1 is appropriate. If the displacement is less than 1mm, spline 1 needs to be properly adjusted. Lengthen until the displacement of the end is...

Embodiment 2

[0076] Such as Figures 3 to 6 As shown, the present embodiment is the testing method of the Young's modulus of the loudspeaker vibrating parts. First, a long strip-shaped spline 1 is intercepted in a flat material, and the length, width, thickness, weight, and density of the spline 1 are measured. ;Such as image 3 As shown, one end of the spline 1 is fixedly clamped on the fixture 2, and the other end is a cantilever beam, and then a concentrated load 5 is applied to any point a of the cantilever beam; then the deflection 3 at the end of the spline 1 is measured by a projector; finally, according to the deflection The calculation formula calculates the Young's modulus of spline 1. Because the weight of spline 1 is very small, that is to say, the load on spline 1 is very small, which ensures that the deformation of spline 1 is within the elastic range of the material, and spline 1 can be tested repeatedly without There is the problem of "fatigue" of spline 1, but because th...

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Abstract

The invention relates to a method for testing Young modulus, which comprises the following steps: cutting out a section of strip-shaped sample band from a smooth material and measuring the length, the width, the thickness, the weight and the density of the sample band; fixing and clamping one end of the sample band on a clamp and enabling the other end to be a suspended beam; placing the clamped sample band on a horizontal optical projector worktable and ensuring the sample band to be placed horizontally and vertically to projecting light so as to obtain the defection of the sample band in still state, that is vertical displacement; and calculating Young modulus of the sample band according to the flexural deformation deflection curve differential equation theory of mechanics of materials and the deformation typical conclusion formula of the beam under the action of simple loading. The testing method simply and accurately measure Young modulus of materials with smaller Young modulus magnitude.

Description

technical field [0001] The invention relates to a testing method for Young's modulus, in particular to an accurate testing method for the Young's modulus of materials used for loudspeaker vibration parts with small Young's modulus levels. Background technique [0002] For the measurement of the elastic modulus of most metal materials, the strain resistance sheet is attached on the surface of the material, the deformation of the material is measured by applying a load and the resistance change of the resistance sheet, and the Yang of the material is calculated by the deformation amount and the load. Some people have applied this method to the Young's modulus test of materials used in loudspeaker vibration parts. There is a big difference, such as the Young's modulus of ordinary carbon steel is about 200GPa, the Young's modulus of copper and its alloys is 72-128GPa, and the materials used for the vibration parts of the speaker are mainly paper, plastic, rubber, and impregnated...

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Application Information

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IPC IPC(8): G01N3/08
Inventor 陈瑞祥
Owner GUOGUANG ELECTRIC