EFFECTS OF WINDING ANGLES ON MECHANICAL PROPERTIES OF FILAMENT
WOUND PIPES
Simona Naseva1, Vineta Srebrenkoska1, Svetlana Risteska2, Maja Stefanovska2, Sara Srebrenkoska3
1
Faculty of Technology, University Goce Delchev – Shtip, R.Macedonia, Krste Misirkov 10-A, Shtip, [email protected]
2Institute for Advanced Composites and Robotics, Prilep, R.Macedonia, Krusevski pat bb, 7500 Prilep
3Faculty of Technology and Metallurgy, Ss.Cyril & Methodius University, Skopje, R.Macedonia, Ruger Boskovic 16, 1000 Skopje
Abstract
The aim of this study is to investigate the mechanical properties of continuous glass fiber reinforced composite tubes produced by filament winding technique with three different
winding angles. With help of split-disk tests hoop tensile properties of selected specimens were determined, where reliable results were obtained with low standard deviations. It was
observed that bigger winding angle lead to higher hoop tensile properties of filament-wound tubular samples.
Also, the effect of reinforcement direction on the mechanical performances of these composites has been presented. Fiber fracture and fiber-matrix debonding is observed to be the
dominant failure mechanisms by samples winded with bigger winding angles, whereas delamination in addition to these mechanisms is detected by samples with smaller winding
angles. From received results it is concluded that, mechanical properties of composite specimens are depended from winding angles in filament winding technology.
With help of conducted SEM analysis good merger between glass fibers and the epoxy matrix was seen, but cracks within plies and broken fiber were noticed, due to the high fiber
branching.
Experimental
Materials
Dimensions and winding angles of test samples
Sample
Designation
1
2
3
1 -1
1-2
1-3
2-1
2-2
2-3
3-1
3-2
3-3
Weight
(g)
52,8
52,8
53,8
42,2
43,0
43,7
53,6
53,8
53,8
Width
(mm)
14,06
14,12
14,12
13,97
13,85
14,00
14,01
13,9
14,01
Thickness
(mm)
3,64
3,64
3,65
Winding
angle (0)
3,18
3,14
3,14
3,18
3,16
3,16
90
10
45
Result and discussion
2000
Force (N)
Force (N)
90000
60000
30000
1500
1000
500
0
0
0
2
4
Displacement (mm)
0
6
a) Force and displacement of sample 1-2
0,5
1
Displacement (mm)
1,5
b) Force and displacement of sample 2-3
Force ( N)
25000
Cross-sectional area on
which hoop tensile stress is
applied
Split disk test specimen (NOL-ring) and test fixture
20000
15000
10000
5000
0
0
2
4
6
8
Displacement (mm)
10
c) Force and displacement of sample 3-2
Hoop tensile strength results of split-disk tests
Sample
Designation
Fmax (N)
1 -1
1-2
1-3
2-1
2-2
2-3
3-1
3-2
3-3
94500
90250
93000
1600
1250
1759
25000
24225
24400
Fmax
average
(N)
92583,33
1536,25
24541,67
Tensile strength
(MPa)
923,24
877,97
902,25
18,00
14,34
20,00
280,57
275,76
275,57
Tensile strength
average
(MPa)
901,15
27,45
277,30
SEM photographs of failure section so split-disk specimens