4) ability that have high hardness and stand in shock of pedestrian or machine operation etc. is big.
On the other hand, shortcoming is
1) withstand to Apchukryeok, force that press, but is weak in tensility, force that pull.
2) because weight is high than strength, weight of building is heavy.
This is repletion fairly by high-strength concrete and light weight concrete development, use.
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
(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 부식에 대한 저항이 크다. 질화강은 질화처리 후 담금질 할 필요가 없고 변형이 적다. 600℃ 이하에서는 경도가 감소되지 않고 산화도 잘 안 된다.
480 people have increased 119% in 2010, not until the 81,789 people a room patients by recording a 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 ave
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