208 Mechanics of Composite Materials,Second Edition TABLE 3.1 Typical Properties of Fibers(SI System of Units) Property Units Graphite Glass Aramid Axial modulus GPa 230 85 124 Transverse modulus GPa 22 85 6 Axial Poisson's ratio 0.30 0.20 0.36 Transverse Poisson's ratio 0.35 0.20 0.37 Axial shear modulus GPa 22 35.42 3 Axial coefficient of thermal expansion um/m/C -1.3 5 -5.0 Transverse coefficient of thermal expansion um/m/C 7.0 5 4.1 Axial tensile strength MPa 2067 1550 1379 Axial compressive strength MPa 1999 1550 276 Transverse tensile strength MPa 77 1550 > Transverse compressive strength MPa 4 1550 > Shear strength MPa 36 35 21 Specific gravity 1.8 2.5 1.4 TABLE 3.2 Typical Properties of Matrices(SI System of Units) Property Units Epoxy Aluminum Polyamide Axial modulus GPa 3.4 71 3.5 Transverse modulus GPa 3.4 71 3.5 Axial Poisson's ratio 0.30 0.30 0.35 Transverse Poisson's ratio 一 0.30 0.30 0.35 Axial shear modulus GPa 1.308 27 1.3 Coefficient of thermal expansion um/m/C 63 23 90 Coefficient of moisture expansion m/m/kg/kg 0.33 0.00 0.33 Axial tensile strength MPa 72 276 54 Axial compressive strength MPa 102 276 108 Transverse tensile strength MPa 2 276 54 Transverse compressive strength MPa 102 276 108 Shear strength MPa 34 138 54 Specific gravity 1.2 2.7 1.2 1.Density of lamina 2.Mass fractions of the glass and epoxy 3.Volume of composite lamina if the mass of the lamina is 4 kg 4.Volume and mass of glass and epoxy in part(3) Solution 1.From Table 3.1,the density of the fiber is P=2500k8/m3. 2006 by Taylor Francis Group,LLC208 Mechanics of Composite Materials, Second Edition 1. Density of lamina 2. Mass fractions of the glass and epoxy 3. Volume of composite lamina if the mass of the lamina is 4 kg 4. Volume and mass of glass and epoxy in part (3) Solution 1. From Table 3.1, the density of the fiber is TABLE 3.1 Typical Properties of Fibers (SI System of Units) Property Units Graphite Glass Aramid Axial modulus Transverse modulus Axial Poisson’s ratio Transverse Poisson’s ratio Axial shear modulus Axial coefficient of thermal expansion Transverse coefficient of thermal expansion Axial tensile strength Axial compressive strength Transverse tensile strength Transverse compressive strength Shear strength Specific gravity GPa GPa — — GPa μm/m/°C μm/m/°C MPa MPa MPa MPa MPa — 230 22 0.30 0.35 22 –1.3 7.0 2067 1999 77 42 36 1.8 85 85 0.20 0.20 35.42 5 5 1550 1550 1550 1550 35 2.5 124 8 0.36 0.37 3 –5.0 4.1 1379 276 7 7 21 1.4 TABLE 3.2 Typical Properties of Matrices (SI System of Units) Property Units Epoxy Aluminum Polyamide Axial modulus Transverse modulus Axial Poisson’s ratio Transverse Poisson’s ratio Axial shear modulus Coefficient of thermal expansion Coefficient of moisture expansion Axial tensile strength Axial compressive strength Transverse tensile strength Transverse compressive strength Shear strength Specific gravity GPa GPa — — GPa μm/m/°C m/m/kg/kg MPa MPa MPa MPa MPa — 3.4 3.4 0.30 0.30 1.308 63 0.33 72 102 72 102 34 1.2 71 71 0.30 0.30 27 23 0.00 276 276 276 276 138 2.7 3.5 3.5 0.35 0.35 1.3 90 0.33 54 108 54 108 54 1.2 f 3 ρ = 2500 kg / m . 1343_book.fm Page 208 Tuesday, September 27, 2005 11:53 AM © 2006 by Taylor & Francis Group, LLC