bending strength) is lacking.
Iron frame concrete method of construction is making thereby.
Advantage of RC (Reinforced Concrete) structure is as following.
1) high economic performance
2) because resources expense is inexpensive than steel-frame structure) corrosion resistance that prevent corrosion of interior reinforcing rod because is alkalinity is security
3) have excellent modeli
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
3) 표면 경화법
① 화학적 표면 경화법
ⅰ) 침탄법: 고체(목탄, 코우크스), 가스(CO,CO2,메탄,에탄,프로판), 침탄깊이 0.5~2mm
ⅱ) 시안화법: KCN, NaCN (청화법)
ⅲ) 질화법: NH3, 50~100 Hr, 자동차의 크랭크축, 캠, 펌프축 등에 사용. 질화층 0.4~0.8mm
* 특징: 경화층이 얕고 경화는 침탄한 것보다 크다. 마모 및
36% increase compared to 2009 and has achieved a performance. Medical tourism revenue of 54.7 billion won in total medical expenses to an average of 6.56 million won inpatient and outpatient medical expenses to average hospitalization of 540,000 won. Average total medical expenses of the foreign average 940,000 won one of the medical bills and expenses, of the total foreign patients hospitalized
실험 방법
시편에 JIG가 놓여질 위치, Load Applicator가 누르게 될 위치에 금긋기를 한다.
시험기에 받침대를 올려놓고, 받침대 사이의 거리를 규정대로 맞춘다.
Load Applicator를 장치한다.
시편을 장착하고 Load Applicator를 댄다.
받침대와 Load Applicator가 서로 평행한지를 조사한다.
Test Condition을 정