PSI - Issue 42

Ayse Cagla Balaban et al. / Procedia Structural Integrity 42 (2022) 292–298 Ayse Cagla Balaban et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Five specimens of each material were tested, and forces vs displacement values were recorded until the fracture. Flexural strength was calculated by the following formula: = 3 2 2 (2) where is the flexural strength in MPa, is the maximum load applied to the specimen in Newton, is the span in between the supports (160 mm), and and are respectively the width and height of the specimen in mm. The experimental results of 3- point bending test specimens can be seen in Table 3.

Table 3. Results of 3-Point Bending Tests Material Number

Maximum Force (N)

Flexural Strength (MPa)

Specimen Number

1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5

244 254 233 245 261 254 256 247 265 262 704 711 723 702 703 752 733 742 744 748

260.46 271.02 248.61 261.42 278.49 271.32 273.21 263.43 282.24 279.78 751.52 758.62 771.64 748.56 749.66 802.64 782.50 792.12 794.13 798.61

Material 1

Material 2

Material 3

Material 4

3. Results and Discussions Fibre clothes are commonly used in order to improve the flexural strength of composite resins. Nonetheless, with resin composites, the effect is expected to be more pronounced in a flexural strength test because they are more sensitive to tensile stress than compressive stress (Ferracane,1998). The results from tensile and flexural tests with pure epoxy and CNT-reinforced composites were analysed in terms of tensile strength and flexural strength measured experimentally. The tensile and flexural strength values of all materials can be seen in Table 4.