PSI - Issue 31

G. Kastratović et al. / Procedia Structural Integrity 31 (2021) 127 – 133 G. Kastratovi ć et al. / Structural Integrity Procedia 00 (2019) 000–000

129

3

The fiberglass was twilled perpendicularly (θ 1 =0°, θ 2 =90°), and was produced by Interglas manufacturer in accordance with standard 8.4548.60 and LN9169. The most important properties of the composite components, as well as calculated properties of lamina, are presented in tables 1– 4.

Table 2. Chemical composition of the glass. Chemical composition

Share [%]

Silicon-oxide

52-56 12-16 5-10 0-2 0-5 16-25 0-1.5 0-0.8

Aluminium (III)-oxide Boron (III)-oxide Sodium (I)-oxide and Potassium(I)-oxide Magnesium (II)-oxide Calcium (I)-oxide Titanium (IV)-oxide Iron (III)-oxide

Iron

0.1

Table 3. Mechanical properties of mixed resin. Property

Value 1200 55-65 3-4 2.5-2.8 85-100

Unit

Density

[kg/m 3 ] [MPa] [%] [GPa] [MPa]

Tensile strength, Rm Elongation, ε Tensile elasticity modulus, E Tensile strength, R F Bending elasticity modulus, E

3-3.3

[GPa]

Table 4. Evaluated mechanical properties of lamina. Property

Value 10.62 10.62 0.28 222.86 2.95 2.95

Unit

[GPa] [GPa] - [MPa] [%] [GPa] [GPa]

Young elasticity modulus E 1 Young elasticity modulus E 2 Poisson coefficient ν 12 Tensile strength, F 1T Elongation, ε Plain shear modulus, G 12

Interlaminar shear modulus, G 23 =G 13

2.86

3. Experimental investigation Tests presented in this paper were carried out in accordance with ASTM 3039 standard (tensile tests) and ASTM 7264 (three-point bending tests). Details regarding these standards can be found in ASTM D7264/D7264M-15. Dimensions of the test specimens used are 250 x 25 x 2.5 mm (Fig. 2). Ten specimens for each fiber orientation angle (0°, 45°, and 90°) have been made (in total 30) and tested at the standard room temperature (t=20°C): fifteen with tensile load and fifteen using a bending load. Tests were carried out on electro-mechanical testing machine SCHENK TREBEL RM 200, Fig. 3(a). During the tensile tests, force F and elongation ∆ were continually recorded. The range of extensometer measurement was +2,5mm (accuracy ± 0.05 mm). During three-point bending tests applied force P was continuously monitored, as well as the deflection δ of the specimen, with the same range of extensometer measurement +2,5mm (accuracy ± 0.05 mm). Here, experimental values obtained in tensile and bending tests of specimens with fiber orientation angle 0 0 will be presented. Then, the tensile test results will be compared to equivalent numerical values for the purpose of FE model verification.