TABLE 2.1 Typical Mechanical Properties of a Unidirectional Lamina (SI System of Units) Glass/ Boron/ Property Symbol Units Graphite/ epoxy Fiber volume fraction V 0.45 0.50 0.70 Longitudinal elastic modulus E GPa 38.6 204 181 Transverse elastic modulus E2 GPa 8.27 18.50 10.30 Major Poisson's ratio V12 0.26 0.23 0.28 Shear modulus G12 GPa 4.14 5.59 7.17 Ultimate longitudinal tensile (01) ult MPa 1062 1260 1500 strength Ultimate longitudinal (01) ult MPa 610 2500 1500 compressive strength Ultimate transverse tensile (02) ult MPa 31 64 61 strength Ultimate transverse (02) ult MPa 118 202 246 compressive strength Ultimate in-plane shear (112) ult MPa 72 67 40 485 40 68 strength Longitudinal coefficient of 1 m/m/C 8.6 96 6.1 0.02 thermal expansion Transverse coefficient of 2 m/m/C 22.1 30.3 22.5 thermal expansion Longitudinal coefficient of 1 m/m/kg/kg 0.00 0.00 0.00 moisture expansion Transverse coefficient of 2 m/m/kg/kg 0.60 0.60 0.60 moisture expansion Source: Tsai, S.W. and Hahn, H.T., Introduction to Composite Materials, CRC Press, Boca Raton, FL, Table 1.7, p. 19; Table 7.1, p. 292; Table 8.3, p. 342. Reprinted with permission.