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Method for testing and determining material or organizational Yang modulus and poisson ratio by impression

A technology of Young's modulus and Poisson's ratio, applied in the direction of applying stable tension/pressure to test the strength of materials, instruments, calculations, etc., can solve problems such as inaccurate calculations and changes in Poisson's ratio, and achieve a simple measurement process , test and calculation results are accurate

Inactive Publication Date: 2007-10-31
THE HONG KONG POLYTECHNIC UNIV
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Problems solved by technology

Therefore the assumption of Poisson's ratio will introduce some degree of inaccuracy in the calculation
In addition, when the indentation method is applied to engineering materials, biological materials, the value of Poisson's ratio may also change significantly

Method used

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  • Method for testing and determining material or organizational Yang modulus and poisson ratio by impression
  • Method for testing and determining material or organizational Yang modulus and poisson ratio by impression
  • Method for testing and determining material or organizational Yang modulus and poisson ratio by impression

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Embodiment Construction

[0032] Preferred embodiments of the present invention will be described in detail below according to the concept of the present invention.

[0033] As mentioned in the background art, Young's modulus can be determined by equation (1):

[0034] E = ( 1 - v 2 ) 2 · a · κ ( v , a / h ) · P w - - - ( 1 )

[0035] In equation (1), E is Young's modulus, P is indentation pressure, v is Poisson's ratio, w is indentation deformation, a is the indenter size, h is the thickness...

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Abstract

This invention relates to one Yang mole and Poisson's ratio method through press to determine materials and organization, which comprises the following steps: in one single press test, adopting press head size as a on its press head and materials and organization by press force P to get press deformation as w press; then according to data from press test and through pressure P and press deformation w linear relation to get Yang mold volume and to get Poisson's proportion between pressure P and press deformation w non-linear relation.

Description

technical field [0001] The present invention relates to a method for measuring the mechanical properties of engineering materials, biological materials, and biological tissues including articular cartilage, skin, and bone, etc., through indentation testing using a desktop or portable device, and more particularly relates to a method for simultaneously determining material properties through indentation testing. Or tissue Young's modulus and Poisson's ratio methods. Background technique [0002] Young's modulus is also called elastic modulus. Young's modulus is a physical quantity that reflects the relationship between material deformation and internal stress. It specifically refers to the ratio of stress to strain along the loading direction on the loading plane, and is often used for Describe the elasticity of the material. Poisson's ratio is the ratio of transverse strain to axial strain. The mechanical properties of isotropic elastic materials can be described by Young'...

Claims

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Application Information

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IPC IPC(8): G01N3/08G06F19/00
Inventor 郑永平蔡邦智
Owner THE HONG KONG POLYTECHNIC UNIV
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