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Determination method of Young's elastic modulus of thin film

A technique for measuring Young's modulus of elasticity, applied in the direction of testing the strength of materials by applying stable tension/compression

Inactive Publication Date: 2016-08-24
CHONGQING UNIV
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Problems solved by technology

Therefore, from this point of view, the existing method can only be used in the situation where the film rotation angle θ is small (that is, the applied lateral load q is small), but not suitable for the situation where the film rotation angle θ is large (that is, the applied lateral load q is small). When the lateral load q is large)

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  • Determination method of Young's elastic modulus of thin film
  • Determination method of Young's elastic modulus of thin film
  • Determination method of Young's elastic modulus of thin film

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[0014] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0015] Such as figure 1 As shown, use a clamping device with an inner radius of a=20mm to fix and clamp a rubber film with a Poisson’s ratio ν=0.47 and a thickness of h=0.06mm to form a round film with a radius of a=20mm and a fixed and clamped periphery. , and apply a uniform load q to the circular film laterally (perpendicular to the plane of the film). When q=0.001MPa, measure the maximum deflection w at the center point of the circular film (r=0) m =4.26mm, and the deflection w at r=10mm on the circular film r＝10 =3.3mm (film rotation angle θ=10.9° at r=10mm); when q=0.01MPa, measure the maximum deflection w at the center point of the circular film (r=0) m =9.36mm, and the deflection w at r=10mm on the circular film r＝10 =7.51mm (film rotation angle θ=21.3° at r=10mm); when q=0.1MPa, measure the maximum deflection w at the center point of t...

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Abstract

The invention discloses a determination method of Young's elastic modulus of a thin film. The method comprises the steps that a clamping device of which the internal radius is a is adopted for fixedly clamping a thin film of which the thickness is h, and the Poisson's ratio is v, and a circular thin film of which the radius is a, and the periphery is fixedly clamped is formed; loads q are applied and uniformly distributed in the transverse direction of the circular thin film, and the Young's elastic modulus E of the thin film can be obtained on the basis of accurate analysis of the static equilibrium problem of the axisymmetric circular thin film by means of the maximum deflection measured value w<m> of the circular thin film. According to the determination method of the Young's elastic modulus of the thin film, a thin-film small rotation angle assumption is thoroughly abandoned, and therefore the influence of a thin-film rotation angle theta on a calculation error is thoroughly eliminated; meanwhile, the limiting condition that the transverse loads q cannot be too large is eliminated, and convenience is provided for determination operation work.

Description

technical field [0001] The invention relates to a method for measuring Young's modulus of elasticity of a film. Background technique [0002] The analytical solution to the static equilibrium problem of a circular membrane fixed and clamped around the perimeter has applications in many technical fields, such as applications in diaphragm instruments, instrument design issues, and in the mechanical performance testing of membrane materials and membrane / base systems application etc. However, so far, the analytical solutions to the static equilibrium problem of a circular membrane fixed and clamped around the periphery have been obtained under the assumption that the membrane rotation angle is small. For example, the applicant's previous invention patent "Geometric Measurement of Poisson's Ratio and Young's Modulus of Film Material" (Patent No.: ZL200910190983.9) used the analytical solution of the circular film problem under the action of uniform load (the famous Hencky solut...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 孙俊贻练永盛杨志欣何晓婷蔡珍红郑周练谢小军
Owner CHONGQING UNIV
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