목차

요약 ············································································· ⅰ
목차 ············································································· ⅲ
표 목차 ········································································· ⅴ
그림 목차 ······································································· ⅵ
Ⅰ. 서론······················································································································1
1.1 연구배경······································································································1
1.2 연구목적······································································································9
Ⅱ. 이론적 배경 ······································································································10
2.1 3D 프린터·····································································································10
2.1.1 3D 프린터의 역사················································································10
2.1.2 3D 프린터의 정의················································································11
2.1.3 3D 프린터의 원리 및 특성 ································································12
2.1.4 용융 적층 모델링(Fused Deposition Modeling, FDM) ···············17
2.2 고분자 수지··································································································19
2.2.1 ABS 수지 (Acrylonitrile Butadiene Styrene) ·······························19
2.2.2 PLA 수지 (Poly Lactic Acid) ··························································23
2.3 기계적 물성 평가························································································26
2.3.1 피로 실험·······························································································26
2.3.2 인장 실험·······························································································26
2.4 유한요소해석(Finite element analysis, FEA) ······································27
Ⅲ. 실험 방법··········································································································29
3.1 3D 프린팅 기술로 제작된 ABS 시편의 피로 시험 및 유한요소해석
···································································································································29
3.1.1 ABS 피로 시편의 3차원 설계 ··························································31
3.1.2 FDM 방식을 이용한 ABS 피로 시편 제작···································36
3.1.3 FDM 방식으로 제작된 ABS 피로 시편의 피로 시험················· 40
3.1.4 유한요소해석법을 이용한 시뮬레이션 ·············································43
3.1.4.1 피로 시편의 형상의 유한요소 모델링 ····································43
3.1.4.2 피로 시편의 경계 조건, 하중 조건, Mesh의 형태 및 재질44
3.2 3D 프린팅 기술로 제작된 PLA 시편의 인장 실험·····························46
3.2.1 PLA 인장 시편의 3차원 설계···························································48
3.2.2 FDM 방식을 이용한 PLA 시편의 제작 ·········································50
3.2.3 FDM 방식으로 제작된 PLA 시편의 인장 실험··························· 57
Ⅳ. 결과 및 고찰····································································································60
4.1 FDM 방식으로 출력된 ABS 시편의 피로 시험 및 유한요소해석·· 60
4.1.1 노치형상에 따른 피로 파괴 ·······························································60
4.1.2 피로 시험의 결과 ·················································································62
4.1.3 유한요소해석을 이용한 ABS 시편의 피로 평가·························· 64
4.2 FDM 방식으로 출력된 PLA 시편의 인장 실험··································70
4.2.1 내부 채움 밀도에 따른 PLA 시편의 인장 실험 ···························70
4.2.2 내부 형상에 따른 PLA 시편의 인장 실험·····································77
Ⅴ. 결론····················································································································83
참고문헌···················································································································87
영문초록···················································································································90