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Mechanical Properties of Carbon Fibre Composite Materials

Mechanical Properties of Carbon Fibre Composite Materials, Fibre / Epoxy resin (120°C Cure)

Fibres @ 0° (UD), 0/90° (fabric) to loading axis, Dry, Room Temperature, Vf = 60% (UD), 50% (fabric)
  Symbol Units Std CF
Fabric
HMCF
Fabric
E glass
Fabric
Kevlar
Fabric
Std CF
UD
HMCF
UD
M55**
UD
E glass
UD
Kevlar
UD
Boron
UD
Steel
S97
Al.
L65
Tit. dtd
5173
Young’s Modulus 0° E1 GPa 70 85 25 30 135 175 300 40 75 200 207 72 110
Young’s Modulus 90° E2 GPa 70 85 25 30 10 8 12 8 6 15 207 72 110
In-plane Shear Modulus G12 GPa 5 5 4 5 5 5 5 4 2 5 80 25  
Major Poisson’s Ratio v12   0.10 0.10 0.20 0.20 0.30 0.30 0.30 0.25 0.34 0.23      
Ult. Tensile Strength 0° Xt MPa 600 350 440 480 1500 1000 1600 1000 1300 1400 990 460  
Ult. Comp. Strength 0° Xc MPa 570 150 425 190 1200 850 1300 600 280 2800      
Ult. Tensile Strength 90° Yt MPa 600 350 440 480 50 40 50 30 30 90      
Ult. Comp. Strength 90° Yc MPa 570 150 425 190 250 200 250 110 140 280      
Ult. In-plane Shear Stren. S MPa 90 35 40 50 70 60 75 40 60 140      
Ult. Tensile Strain 0° ext % 0.85 0.40 1.75 1.60 1.05 0.55   2.50 1.70 0.70      
Ult. Comp. Strain 0° exc % 0.80 0.15 1.70 0.60 0.85 0.45   1.50 0.35 1.40      
Ult. Tensile Strain 90° eyt % 0.85 0.40 1.75 1.60 0.50 0.50   0.35 0.50 0.60      
Ult. Comp. Strain 90° eyc % 0.80 0.15 1.70 0.60 2.50 2.50   1.35 2.30 1.85      
Ult. In-plane shear strain es % 1.80 0.70 1.00 1.00 1.40 1.20   1.00 3.00 2.80      
Thermal Exp. Co-ef. 0° Alpha1 Strain/K 2.10 1.10 11.60 7.40 -0.30 -0.30 -0.30 6.00 4.00 18.00      
Thermal Exp. Co-ef. 90° Alpha2 Strain/K 2.10 1.10 11.60 7.40 28.00 25.00 28.00 35.00 40.00 40.00      
Moisture Exp. Co-ef 0° Beta1 Strain/K 0.03 0.03 0.07 0.07 0.01 0.01   0.01 0.04 0.01      
Moisture Exp. Co-ef 90° Beta2 Strain/K 0.03 0.03 0.07 0.07 0.30 0.30   0.30 0.30 0.30      
Density   g/cc 1.60 1.60 1.90 1.40 1.60 1.60 1.65 1.90 1.40 2.00      
** Calculated figures

Fibres @ +/-45 Deg. to loading axis, Dry, Room Temperature, Vf = 60% (UD), 50% (fabric)
  Symbol Units Std. CF HM CF E Glass Std. CF fabric E Glass fabric Steel Al
Longitudinal Modulus E1 GPa 17 17 12.3 19.1 12.2 207 72
Transverse Modulus E2 GPa 17 17 12.3 19.1 12.2 207 72
In Plane Shear Modulus G12 GPa 33 47 11 30 8 80 25
Poisson’s Ratio v12   .77 .83 .53 .74 .53    
Tensile Strength Xt MPa 110 110 90 120 120 990 460
Compressive Strength Xc MPa 110 110 90 120 120 990 460
In Plane Shear Strength S MPa 260 210 100 310 150    
Thermal Expansion Co-ef Alpha1 Strain/K 2.15 E-6 0.9 E-6 12 E-6 4.9 E-6 10 E-6 11 E-6 23 E-6
Moisture Co-ef Beta1 Strain/K 3.22 E-4 2.49 E-4 6.9 E-4        
** Calculated figures

These tables are for reference / information only and are NOT a guarantee of performance
1 GPa = 1000 MPa = 1000 N/mm² = 145,000 PSI

These tables relate to only 2 of the many fibre orientations possible. Most components are made using combinations of the above materials and with the fibre orientations being dictated by the performance requirements of the product. Performance Composites Ltd. can assist with the design of components where appropriate.


 

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