Issue 64

K. Dileep et alii, Frattura ed Integrità Strutturale, 64 (2023) 229-239; DOI: 10.3221/IGF-ESIS.64.15

simulation and experimentation were 40.63 MPa and 36.86 MPa respectively. The variations in the tensile strength obtained from the experimentation and simulation for all nanocomposites were within 20 %.

Figure 11: Maximum equivalent stress in the S3 tensile specimen.

Tensile strength from simulation in MPa

Tensile strength from experimental results in MPa

Variation in results (in %)

Specimen

S0

26.54

23.07

15.04

S1

32.46

29.61

9.63

S2

33.36

32.08

3.99

S3

40.63

36.86

10.23

S4

20.65

17.83

15.82

S5

16.1

13.6

18.38

Table 4: Simulation results for the samples developed.

C ONCLUSIONS

T

his work investigated the effects of Graphene and SiO 2 on the mechanical and fracture properties of Epoxy-PLA nanocomposites. The composites were manufactured with varying contents of Graphene and SiO 2 (0.1-0.5 wt. %) by solution casting. The composites loaded with 0.3 wt. % fillers exhibited higher tensile, flexural, and fracture toughness compared to other nanocomposites. An increase in tensile strength in the range of 29 % to 60 % was observed with the addition of fillers from 0.1 to 0.3 wt. %, further addition of fillers resulted in a drastic decrease in tensile strength. The flexural strength of composites improved by 5 – 57 % with the addition of nanofillers. An improvement of fracture toughness in the range of 23-104 % was observed in hybrid nanocomposites in-comparison to pristine epoxy-PLA composite. It can be concluded that epoxy-PLA nanocomposites loaded with both Graphene and SiO 2 exhibited better mechanical and fracture properties compared to pristine epoxy-PLA composites. The tensile strength of nanocomposites determined through experimentation and numerical analysis were in close agreement.

R EFERENCES

[1] Mostafa, N.H., Ismarrubie, Z.N., Sapuan, S.M. and Sultan, M.T.H., 2017. Fibre prestressed polymer-matrix composites: a review. Journal of Composite Materials, 51(1), pp.39-66. DOI: 10.1177/0021998316637906. [2] Parveez, B., Kittur, M.I., Badruddin, I.A., Kamangar, S., Hussien, M. and Umarfarooq, M.A., 2022. Scientific Advancements in Composite Materials for Aircraft Applications: A Review. Polymers, 14(22), p. 5007. DOI: 10.3390/polym14225007.

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