나노복합재료연구실 ( Nano Composite Research Lab.)
1. Purpose of this study
■ Measurement of Young's modulus using sonic resonant test
■ Measurement of Young's modulus using beam bending test
2. Introduction
Young's modulus is one of the important materials properties that is related with the bonding force between atoms or ions in materials. That will give a cle
in the range of theory, and the value from the second experiment is 0.16 which also comes under the range of theory. In case of specimen no.1, there was an error of 12.6% but the Poisson's ratio is highly appropriate. From this, we can analogize the Poisson's ratio has nothing to do with strength, but is related to the materials.
4. ShearModulus of Elasticity
‣ Theoretical Value
Shear properties
Shear Property인 ShearModulus 와 Shear Strength는 위의 인장강도 측정에서 측정된 Elastic Modulus 를 사용하여 다음의 식
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을 이용하여 구해 낸다. 는 ShearModulus, 는 Elastic Modulus, 는 Poisson's ratio로써 여기에서는 0.33으로 가정한다.
2.7 Shrinkage
- Theoretical value: (a=35, : Maximum Shrinkage Strain Ratio)
- The process of finding 'a'
1. Arranging excel data
2. Finding 'a' with using a grapher program
(Converting Excel data into graph shape)
(Standardization of graph through regression analysis)-회귀분석을 통한 그래프 평균화
(Finding 'a' with using shrinkage equation)
3. Finding 'a'