Experimental investigation of fracture toughness of fused deposition modeling 3D-printed PLA parts

被引：17
作者：
Kizhakkinan U. [1 ,2 ]
Rosen D.W. [1 ,2 ,3 ]
Raghavan N. [1 ,2 ]
机构：
[1] Digital Manufacturing and Design (DManD) Centre, Singapore University of Technology and Design, Singapore
[2] Engineering Product Development (EPD) Pillar, Singapore University of Technology and Design, Singapore
[3] The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, 30332, GA
来源：
Materials Today: Proceedings | 2022年 / 70卷
关键词：
Fracture toughness; Fused deposition modeling; Polylactic acid;
D O I：
10.1016/j.matpr.2022.10.014
中图分类号：
学科分类号：
摘要：
The fracture toughness of Polylactic acid (PLA) parts printed using the Fused deposition modeling (FDM) additive manufacturing process is experimentally investigated in this study. The compact tension (CT) specimens were printed with 0°/90° and −45°/45° filament orientations at different printing speeds varying from 20 mm/s to 60 mm/s. Fracture toughness values for each process parameter were estimated using the linear elastic fracture mechanics (LEFM) approach. It is observed that the CT specimen printed at the highest speed showed the lowest value of fracture toughness; however, the energy absorbed before failure is the highest. The −45°/45° CT specimen showed higher value of fracture toughness compared to the 0°/90° specimen. Tensile tests were also conducted on PLA filament and part level coupons to estimate the mechanical behavior. The FDM printed tensile coupon showed a brittle failure. However, the PLA filament showed ductile behavior with a clear plastic zone. © 2022
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页码：631 / 637
页数：6
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