재료 압출 방식 3D 프린팅 시편에서 적층 경로에 따른 인장강도의 변화

우인영; 류민영; In Young Woo; Min-Young Lyu

Polymer(Korea), Vol.44, No.6, 769-775, November, 2020

DOI10.7317/pk.2020.44.6.769 Export Citation

재료 압출 방식 3D 프린팅 시편에서 적층 경로에 따른 인장강도의 변화

Variations in the Tensile Strength in Material Extrusion-type 3D Printed Specimens for Various Tool Paths

우인영, 류민영 ^†

서울과학기술대학교 기계디자인금형공학과

In Young Woo, and Min-Young Lyu^†

Department of Mechanical Design and Manufacturing Engineering, Graduate School of Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea

E-mail:

초록

재료 압출 방식 3D 프린팅은 필라멘트 형태의 열가소성 수지가 노즐을 통해 압출되면서 제품을 형성하기 때문에 적층물의 강도 및 내구성에 한계를 가진다. 본 연구에서는 재료 압출 방식 3D 프린팅에서 적층 경로에 따른 인장특성을 분석하였다. 대칭 적층 경로 7개, 비대칭 적층 경로 6개로 총 13가지의 적층 경로로 시편을 제작하여 인장강도를 비교하였다. 또한 사출 성형으로 벌크(bulk) 및 웰드라인 시편을 제작하여 3D 적층 시편과 인장강도를 비교하였다. 3D 프린팅 시편의 적층 경로 15/-15와 30/-30 시편에서 벌크 소재보다 높은 인장강도를 보였으며 적층 경로 90/-90 시편에서는 가장 낮은 인장강도를 보였다. 3D 적층 시편에서 최대 전단 응력이 발생하는 면에서 파단 되는 경우에 인장강도가 가장 크게 나타났다. 3D 프린팅에서 적층 경로 조절을 통해 소재 고유의 인장강도보다 더 큰 인장강도를 갖는 적층물을 얻을 수 있음을 확인하였다.

A material extrusion (ME)-type 3D printed article has limited strength and durability because a thermoplastic resin in the form of a filament is deposited through a nozzle and becomes a product. In this study, the tensile characteristics of ME-type 3D printed specimens were examined according to the tool path. The tensile strengths of thirteen specimens with various tool paths, including seven symmetrical tool paths and six asymmetric tool paths, were measured and discussed. In addition, the tensile strengths of bulk and weldline specimens molded by injection molding were compared with the 3D printed specimens. The specimens fabricated by 3D printing with tool paths of 15/-15 and 30/-30 had higher tensile strength than the bulk specimen, and the lowest tensile strength was found in the 3D printed specimen with a tool path of 90/-90. High tensile strengths were demonstrated in the 3D printed specimens when the specimens were fractured at the surface where the maximum shear stress occurred. This study verified that a higher tensile strength than that of the bulk specimen can be obtained by controlling the tool path in the 3D printed specimens.

Keywords:3D printing;material extrusion-type 3D printing;tool path;tensile strength;anisotropy

[References]

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Kim WJ, J. Korean Soc. Manuf. Process. Eng., 11, 146 (2012)
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Woo IY, Kim DY, Kang HP, Lyu MY, Elast. Compos., 55, 46 (2020)
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Lee SK, Kim YR, Kim SH, Kim JH, J. Korean Soc. Manuf. Process. Eng., 17, 130 (2018)

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[1] Shin YM, Polym. Sci. Technol., 26(5), 404 (2015)

[2] Jinwen Z, Anhua P, Adv. Mater. Res., 538, 444 (2012)

[3] Kim WJ, J. Korean Soc. Manuf. Process. Eng., 11, 146 (2012)

[4] Mo JH, Hong HS, Lyu MY, Trans. Mater. Process., 10, 211 (2003)

[5] Park SJ, Park JH, Lyu MY, Koo MS, Rho HJ, Cho SH, Polym. Korea, 41(3), 531 (2017)

[6] Spoerk M, Gutierrez JG, Sapkota J, Schuschnigg S, Holzer C, Plast. Rubber Compos., 47, 17 (2017)

[7] Chacon JM, Caminero MA, Plaza EG, Nunez PJ, Mater. Des., 124, 143 (2017)

[8] Wu W, Geng P, Li G, Zhao D, Zhang H, Zhao J, Materials, 8, 5834 (2015)

[9] Christiyan KGJ, Chandrasekhar U, Venkateswarlu K, IOP Conf. Ser. Mater. Sci. Eng., 114, 012109 (2016)

[10] Sun Q, Rizvi GM, Bellehumeur CT, Gu P, Rapid Prototyp. J., 14, 72 (2008)

[11] Kalpakjian S, Schmid S, Manufacturing Processes for Engineering Materials-5th Edition, Media Co., Seoul, 2014.

[12] Woo IY, Kim DY, Kang HP, Lyu MY, Elast. Compos., 55, 46 (2020)

[13] Yoon HS, Lyu MY, Jin SC, Polym. Korea, 42(5), 752 (2018)

[14] Lee SK, Kim YR, Kim SH, Kim JH, J. Korean Soc. Manuf. Process. Eng., 17, 130 (2018)