Speakers
Description
Continuous carbon fiber materials are nowadays 3D printed and widely used in different fields such as aerospace, automotive industries, and sports materials. The drive for this extensive use is that carbon fiber has high mechanical strength, and stiffness, and is lightweight. The material properties of the 3D printed samples are commonly done by following established international standards, which show some dimensional differences. This research focused on the study of the influence of the used standards for sample preparation on mechanical and structural properties of 3D printed continuous carbon fiber reinforced composite parts. To understand the failure properties, structural analysis was investigated using SEM. The specimens were fabricated by Markforged Mark two 3D printing machine using carbon fiber as reinforcement and Onyx as matrix materials based on ASTM D638 and ASTM D3039-D3039M standards. The experimental result shows that for specimens fabricated based on ASTM D638, premature failure took place at the location where the straight gauge section of the specimen ends, and the curved transition regions begin due to stress concentration. Meanwhile, tests based on ASTM D3039-3039M have better strength and less stress concentration compared to ASTM D638. For both cases, the fracture analysis from SEM shows fiber breakage, debonding, and fiber pullout, which creates cavities and voids between layers are the reason for failure.
Keywords:
3D printing, Continuous carbon fiber, mechanical properties, and International Standards.
Adugna D Akessa, Prf. Hirpa G Lemu
| Conference Topic Areas | Track8: Design Optimization, Additive Manufacturing Technologies & Applications |
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