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Investigation of the Internal Stress Relaxation in FDM 3D Printing : Annealing Conditions
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FDM 3D프린팅 어닐링 조건에 따른 내부응력 완화에 관한 연구

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Type
Academic journal
Author
Sun Kon Lee (인하대학교) Yong Rae Kim (인하대학교) Su Hyun Kim (인하대학교) Joo Hyung Kim (인하대학교)
Journal
The Korean Society of Manufacturing Process Engineers Journal of the Korean Society of Manufacturing Process Engineers Vol.17 No.4 KCI Accredited Journals
Published
2018.8
Pages
130 - 136 (7page)

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Investigation of the Internal Stress Relaxation in FDM 3D Printing : Annealing Conditions
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In this paper, the effects of different 3D printing parameters including laminated angle and annealing temperature, were observed for their effects on tensile testing. In 3D printing, a filament is heated quickly, extruded, and then cooled rapidly. Because plastic is a poor heat conductor, it heats and cools unevenly causing the rapid heating and cooling to create internal stress within the printed part. Therefore, internal stress can be removed using annealing and to increase tensile strength and strain. During air cooling at annealing temperature 140℃, the strain of laminated angle 45° specimens tended to increase by 46% while the tensile stress tended to increase by 7.4%. During oven cooling at annealing temperature 140℃, the strain of laminated angle 45° specimens tended to increase by 34% while the tensile stress tended to increase by 22.2%. In this study, we found "3D printing with annealing" eliminates internal stress and increases the strength and stiffness of a printed piece. On the microstructural level, annealing reforms the crystalline structures to even out the areas of high and low stress, which created fewer weak areas. These results are very useful for making 3D printed products with a mechanical strength that is suitable for applications.
#Additive Manufacturing(적층가공) #Poly Carbonate Annealing(폴리 카보네이트 어닐링) #3D Printing Laminated Angle(3D프린팅 적층 각도) #3D Printing Annealing(3D프린팅 어닐링)

Contents

ABSTRACT
1. 서론
2. 실험 및 고찰
3. 고찰 및 비고
4. 결론
REFERENCES

References (6)

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[학술지(정기간행물)] - 최재원 / 2015 / 3D 프린팅 기술 동향 / 한국기계가공학회지 14 (3) : 1 ~ 8 dbpia [학술지(정기간행물)] - 장진아 / 2015 / 3차원 프린팅 기술을 이용한 연성 구조물 제작 / 한국기계가공학회지 14 (6) : 142 ~ 148 dbpia [학술지(정기간행물)] - Lanzotti, A. / 2015 / The impact of process parameters on mechanical properties of parts fabricated in PLA with an open-source 3-D printer / Rapid Prototyping Journal 21 (5) : 604 ~ 617 Crossref [학술지(정기간행물)] - Hashima, K. / 2010 / Structure - properties of super-tough PLA alloy with excellent heat resistance / Polymer 51 (17) : 3934 ~ 3939 Crossref [학술지(정기간행물)] - 김동범 / 2015 / PolyJet 적층재료의 파괴기준 설정을 위한 유한요소해석 / 한국기계가공학회지 14 (4) : 134 ~ 139 dbpia

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UCI(KEPA) : I410-ECN-0101-2018-581-003333016