PSI - Issue 56

Balichakra Mallikarjuna et al. / Procedia Structural Integrity 56 (2024) 160–166 Mallikarjuna et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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3.4. Impact strength Impact strength of PETG specimen has been observed to be either 23.6 J/m or 34.3 J/m, as shown in Fig.5. Higher impact strength has been recorded for specimen S3, S5, S6 and S7 with a density of 25%.

Impact Strength

10.0 15.0 20.0 25.0 30.0 35.0 40.0

Impact stregth (J/m)

0.0 5.0

S1

S2

S3

S4

S5

S6

S7

S8

S9

Sample designation

Fig.5. Impact strength.

Conclusions The following conclusions can be drawn from this study:  The least tensile strength has been noted for S1, with 24.9 MPa (20%, 225 ℃ and 20 mm/s) and the highest tensile strength of 35.46 MPa for S9 (30%, 245 ℃ and 25 mm/s).  The highest compression strength has been observed for S9 (2.1 kN) and the least for S1 (1.08 kN). The compression strength is directly proportional to the infill density.  The impact strength of the samples (S3, S5, S6 and S7) was highest, where the print speed was 25 mm/s.  The samples S4, S5, and S6 have shown better mechanical properties than the counterpart S1, S2, S3, S7, S8, and S9 samples.  Optimized process parameters would be used to fabricate the spectacle frame prototype via the FDM process in the future work. Acknowledgements The authors would like to thank the additive manufacturing lab, Mechanical Engineering Department, Amrita Vishwa Vidyapeetham, Coimbatore and National Institute of Technology Tiruchirappalli Tamil Nadu, India. References Bedi, S. S., Mallesha, V., Mahesh, V., Mahesh, V., Mukunda, S., Negi, S., & Ponnusami, S. A. (2023). Thermal characterization of 3D printable multifunctional graphene-reinforced polyethylene terephthalate glycol (PETG) composite filaments enabled for smart structural applications. Polymer Engineering and Science , June , 1 – 16. https://doi.org/10.1002/pen.26409 Bedi, S. S., Mallesha, V., Mahesh, V., Mahesh, V., & Ponnusami, S. A. (2023). Investigation of low-percentage graphene reinforcement on the