-Conclusion & Discussion
Poisson's ratio is derived by dividing the horizontal strain modulus by perpendicular strain modulus. Poisson's ratio is a characteristic value of materials, and concretes have 0.16∼0.22 of it. The Poisson's ratio from the first experiment is 0.18 and this is comprised in the range of theory, and the value from the second experiment is 0.16 which also comes under th
and 67.15% of normal required value.
Relationship with tensile strength came out similar to theoretical value so that cylinder were manufactured right except for the weakened strength,
- Elastic modulus showed 18~25% of error since compressive strength did not reach proportion strength. It is secondary result as it can't reach compression strength
- Considering Poisson's ratio is in 0.16~0.22
of graph through regression analysis)-회귀분석을 통한 그래프 평균화
(Finding 'a' with using shrinkage equation)
3. Finding 'a'=66.39
■ Result discussion
Because we used a broken gage, we're choosing remains of 2 gages.
The greatest error in shrinkage test was that we couldn't get a expected strain; because we had a mistake not exactly attaching gages.
2.8 Creep
tensile test)
인장실험은 시편 양끝에 인장 실험용 jig를 설치한 측정한다.
각 시편의 특성에 따라 가해지는 힘에 따라 변형 또는 파단이 일어나게 되는데 이를 각각 인장 변형률 (tensile strain)과 인장강도(tensile stress)라 한다.
인장변형률(ε) : ε =∆L/L0
인장강도(σ) : 변형(또는 파단)이 일어날 때