PUKYONG

음향방출법을 이용한 유리의 비커스 압입 균열 특성

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Abstract
Acoustic emission (AE) is known to be sensitive to fracture process and so it was expected that AE data may propose as a means of monitoring the fracture information. The aim of this study is to analyze the characteristic of AE signal emitted from glass during vickers indentation. To observe AE characteristics by surface effect, both glass and coating glass were studied. Monitoring of acoustic emission waveforms is employed to characterize the initiation and progression of induced cracks during vickers indentation. During loading, AE signal resulted from penny-like crack is detected. During unloading, AE signal resulted from both radial/median crack and lateral crack is detected. During loading, AE peak amplitude for coating glass is higher than for glass due to stress intensity. During unloading, AE peak amplitude for coating glass is lower than for glass due to surface toughness of coating effect. In precedent study the correlation between AE energy and radial/median crack length is acquired to equation in terms of the strain energy generated from glass during vickers indentation. The emission energy(ε) is found to be approximately proportional to the crack dimension(C) both glass and coating glass.
Author(s)
박혜연
Issued Date
2011
Awarded Date
2011. 2
Type
Dissertation
Keyword
Glass Coating glass Vickers indentation Acoustic emission test Radial/Median Crack
Publisher
부경대학교
URI
https://repository.pknu.ac.kr:8443/handle/2021.oak/9795
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001964053
Affiliation
부경대학교 대학원
Department
대학원 소재프로세스공학과
Advisor
박흥일
Table Of Contents
Abstract

1. 서 론 1
1.1 연구 배경 및 필요성 1
1.2 연구목적 및 개요 5

2. 이론적 배경 6
2.1 IF법 6
2.1.1 IF법의 원리 6
2.1.2 취성재료에 IF법 시 균열 발생 및 전개 10
2.2 AE 시험 12
2.2.1 AE 시험의 원리 12
2.2.2 AE 계측장치 14
2.2.3 AE 신호처리 17

3. 압입 시험 19
3.1 실험 재료 및 방법 19
3.1.1 실험 재료 19
3.1.2 실험 방법 21
3.2 실험 결과 및 고찰 22
3.2.1 유리의 파단면 관찰 22
3.2.2 유리와 코팅유리의 경도 비교 23
3.2.3 유리와 코팅유리의 표면 균열 비교 25
3.2.4 유리와 코팅유리의 균열 모델 30

4. AE 시험 34
4.1 실험 방법 34
4.2 실험 결과 및 고찰 36
4.2.1 유리에 비커스 압입시 방출된 AE 신호 처리 36
4.2.2 코팅유리에 비커스 압입시 방출된 AE 신호 처리 42
4.2.3 유리와 코팅유리의 AE 최대 진폭 비교 48
4.2.4 IF 메카니즘을 이용한 균열길이와 AE 에너지 상관관계 53

5. 결론 58

6. 참고문헌 59

감사의 글
Degree
Master
Appears in Collections:
대학원 > 소재프로세스공학과
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