and apply for engineering field. As a result, the new methods that can be measure Young's modulus with reliability and reappearance are needed to develop the new materials i.e. composite and thin film materials.
In general, there are two methods to measure the Young's modulus. The first one is called the 'static method' that is the way to measure the deformation strain that are corresponded to
and this is comprised 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. Shear Modulus of Elasticity
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-결과 및 토의
1. 압축강도 실험 중 첫 번째 실험은 12.6% 만큼 강도가 작게 발현 되었으나 두 번째 실험에서는 0.8%의 오차로 이론값과 매우 가깝게 나왔다. 같은 콘크리트를 썼으나 이렇게 두 실험에 차이가 나는 원인은 다짐 문제이다. 실험 당일 각 공시체마다 다른 사람이 다짐을 해서 약간의 차이가
1 and 2 was in range of theoritical value. This shows there was proper uniformity in between well attached strain gauge and cylinder.
- Shear strength compressive strength of cylinder 1 and compressive strength of cylinder 2 measured by using shear strength of cylinder.
- Dry shrinkage showed 13.56% of error by limitation of measuring tools, however, we could find out shrinkage of concrete.