경도시험보고서

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경도시험보고서

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Ⅰ. 서론 ·················································································2
1.1. 연구배경 및 목적··································································2
1.2. 관련이론············································································3
1.2.1 압입경도 시험··································································3
1.2.1.1 브리넬 경도시험 이란?···················································3
1.2.1.1.1 SI 단위로 구하는 경우 ·············································3
1.2.1.1.2 중력단위로 구하는 경우·············································4
1.2.1.1.3 시료편··································································4
1.2.1.1.4 압자의 직경과 시험하중을 조합하여 만든 표·····················4
1.2.1.1.5 압흔의 직경 측정 방법···············································5
1.2.1.1.6 Data의 처리···························································5
1.2.1.2 비커스 경도시험이란?····················································5
1.2.1.2.1 시료편··································································6
1.2.1.2.2 하중선정·······························································6
1.2.1.2.3 Data의 처리···························································6
1.2.1.3 로크웰 경도시험이란?····················································6
1.2.1.3.1 압자의 종류와 시험하중·············································6
1.2.1.3.2 시료편··································································7
1.2.1.3.3 부하속도 조정·························································7
1.2.1.3.4 Data의 처리···························································7
1.2.2 반발경도 시험··································································8
1.2.2.1 쇼어 경도시험이란?·······················································8
1.2.2.1.1 시료편··································································8
1.2.2.1.2 Data의 처리···························································9
Ⅱ. 본론 ·················································································9
2.1 실험방법 ···········································································9
2.1.1 브리넬 경도시험·······························································9
2.1.2 비커스 경도시험······························································10
2.1.3 로크웰 경도시험······························································10
2.1.4 쇼어 경도시험·································································11
2.2 실험 시 주의사항·································································11
2.2.1 시편 제작 할 때의 일반적인 주의·········································11
2.2.2 시험 방법에 따른 주의사항·················································12
Ⅲ. 결과 및 고찰 ···································································12
3.1 경도시험의 결과 ·································································12
3.1.1 브리넬 경도시험······························································12
3.1.2 비커스 경도시험······························································13
3.1.3 로크웰 경도시험······························································13
3.1.4 쇼어 경도시험·································································13
3.2 시험 각각의 결과 비교···························································14
3.3 결과 및 고찰·······································································15
Ⅳ 참고문헌············································································15

본문내용

Ⅰ. 서론

1.1. 연구배경 및 목적
-경도-
재료의 기계적 성질을 알아내는 가장 간단한 방법으로 재료 시험에서는 중요한 역할을 한다. 그러나 경도의 본질적인 물리적 의의는 현재까지 확립되어 있지 않다. 다만 경도에 관한 정의의 기초가 되는 것으로 다음과 같은 설명이 나와 있다. 즉 “어느 물체의 경도란 그 물체를 다른 물체로 눌렀을 때 그 물체의 변형에 대한 저항력의 크기로 규정한다.” 따라서 경도에 관한 이론적 측정법은 거의 모두가 이 개념에 바탕을 두고 있다. 저항력이 큰, 즉 딱딱한 재료는 강도와 내마모성이 크고, 신장율과 단면수축률이 작으므로 그 기계적 성질도 추측할 수 있다. 측정방법은 사용목적, 시료편의 재질 등에 따라 여러 가지 종류가 있기 때문에, 경도는 [-식 경도]로 나타내며 그 각각의 경도에는 많은 경우, 이론적인 연관성이 없고 단위도 붙이지 않는다. 경도라는 용어에 대한 보통설명은 압입저항, 마모저항, 반발저항 등으로 표시한다.

<중 략>

2.1.2 비커스 경도시험
시료조명용의 램프를 켠다. -> Anvil 위에 시료 편을 놓는다. , 시편 면-시험 면은 깨끗이 한다.
(1) 현미경에 Set한다.(홈에 확실히 고정시킨다.)
(2) 시료 대를 위, 아래로 움직이는 핸들을 돌려 시료 대를 위, 아래로 움직인 후 미동 조정나사로 시험 면에 초점을 맞춘다.(시험 면에 대물렌즈가 부딪치지 않도록 주의한다. 압흔의 중심에서 시료의 가장자리까지의 거리는 대각선 길이의 2.5배 이상 떨어져야하고 압흔 사이의 거리는 대각선 길이의 4배 이상으로 해야 한다.) 이유 :압흔 끼리 서로 영향을 주어 경도가 변하기 때문에 영향을 주지 않을 거리를 주어야 한다.
(3) 시험 면은 시험에 지장이 없는 가를 확인한다. (파손되거나 표면이 거칠어 진 경우에는 재차 표면을 다듬질 한다.)
(4) 현미경을 돌려서 Set off를 한다. (여기에서 압자를 측정 위치로 오게 한다.)
(5) 하중을 바꿔주는 핸들을 돌려서 적당한 추를 Set한다. (하중은 미리 시료의 재질에 따라 선정해 둔다.)
(6) 시동 레버를 조작하여 하중을 건다. (약 10~15초 정도 하중을 건다.)
(7) 레버를 돌려서 하중을 제거한다.

참고 자료

- http://blog.naver.com/ares2019?Redirect=Log&logNo=90081164231
- 기계금속재료시험 책
- 재료기초실험 수업 필기자료