Single fibre tensile testing
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1 Single fibre tensile testing Justine Beauson Section of Composites and Materials Mechanics, Department of Wind Energy
2 Introduction Fibre properties Fibre orientation Matrix properties Mechanical performance of composites Porosity Fibre length Fibre content Fibre packing ability Fibre/matrix interface properties 2
3 Introduction Favimat+ and Airobot2 from TechTexhno The alternative Manufacturer s data sheet; Card board method ASTM C procedure. 3
4 Presentation The machine The test The results 4
5 The machine Preparation area Testing area 5 Robot Storage area
6 The machine Preparation area 6 8 November 2016
7 The machine Preparation area 7
8 The machine Preparation area Testing area 8 Robot Storage area
9 The machine Testing area 9
10 The Test 1. Linear density test 2. Tensile test 10
11 The test 1. Linear density test : Resonance frequency : Fibre modulus : Fibre radius L: gauge length : Linear density : Pre-tensioning Force 11
12 The test 1. Linear density Carbon fiber Linear Density T [dtex] Gauge length L: 20mm 1,00 0,80 0,60 0,40 0,20 0,00 0,00 0,50 1,00 1,50 2,00 2,50 3,00 Pretension F [cn/tex] Linear Density T [dtex] 12 Gauge length L: 40mm 1,00 0,80 0,60 0,40 0,20 0,00 0,00 1,00 2,00 3,00 4,00 Pretension F [cn/tex] Linear Density T [dtex] Gauge length L: 50mm 1,00 0,80 0,60 0,40 0,20 0,00 0,00 1,00 2,00 3,00 4,00 Pretension F [cn/tex]
13 The test 1. Linear density Glass fiber Linear Density T [dtex] Gauge length L: 20mm 10,00 8,00 6,00 4,00 2,00 0,00 0,00 1,00 2,00 3,00 4,00 Pretension F [cn/tex] Linear Density T [dtex] 10,00 8,00 6,00 4,00 2,00 0,00 0,00 1,00 2,00 3,00 4,00 13 Gauge length L: 40mm Pretension F [cn/tex] Linear Density T [dtex] Gauge length L: 50mm 10,00 8,00 6,00 4,00 2,00 0,00 0,00 1,00 2,00 3,00 4,00 Pretension F [cn/tex]
14 The test 1. Linear density A Density measured with pycnometer
15 The test 2. Tensile test 15
16 The results Glass fibres 1. Linear density 2. Tensile test 16
17 The results 1. Linear density Comparison vibroscopy / microscopy Linear density, T [dtex] Vibroscopy Cross sectional area [µm 2 ] Microscopy Average diameter measured [µm] Cross sectional area [µm 2 ] Relative difference [%] Fibre 1 5, ,24 ± 0, Fibre 2 5, ,32 ± 0, Fibre 3 6, ,55 ± 0, Fibre 4 4, ,44 ± 0, Fibre 5 4, ,04 ± 0, Fibre 6 8, ,55 ± 0, Fibre 7 5, ,30 ± 0, Fibre 8 5, ,02 ± 0, Fibre 9 5, ,74 ± 0, Fibre 10 5, ,92 ± 0, Average 8 17
18 The results 1. Linear density Effect of sizing pristine Percentage Acetone washed From 3 to 4 From 4 to 5 From 5 to 6 From 6 to 7 From 7 to 8 From 8 to 9 From 9 to 10 From 10 to 11 Linear density [dtex] 18
19 The results 2. Tensile test Machine compliance Glass fibres The contribution by the load train system and specimen-gripping system to the indicated crosshead displacement, by unit of force exerted in the load train. Gauge length /Modulus (mm/gpa) 1 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 y = 0,0121x + 0, Gauge Length Lo [mm] : Experimental modulus : gauge length : slope of the curve : Actual modulus 19
![sizing Stress [MPa]](/docs-images/87/96795772/images/20-2.jpg "Stress [MPa] Strain")
20 The results 2. Tensile test Sizing removal Acetone washing to remove sizing Stress [MPa] Stress [MPa] Strain [MPa] 20
21 The results 2. Tensile test Data post-processing Double fibre tested (strange stiffness, doubled linear density) Gliding in the clamps 4000 The raw data 49 data Deficient test removed 42 data Stress [MPa] Stress [MPa] Stress [MPa] Strain [%] Strain [MPa] Stiffness [GPa] Strength [MPa] Average 92, Std dev. 90, Strain [MPa] Stiffness [GPa] Strength [MPa] Average 80, Std dev. 0,6 452
22 Thanks you for your attention! Justine Beauson Development Engineer DTU Wind Energy Technical University of Denmark Department of Wind Energy Frederiksborgvej 399 Building Roskilde Denmark Direct
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