TABLE 2.2 Typical Mechanical Properties of a Unidirectional Lamina (USCS System of Units) Glass/ Boron/ Graphite/ Property Symbol Units epoxy epoxy epoxy Fiber volume fraction V - 0.45 0.50 0.70 Longitudinal elastic E Msi 5.60 29.59 26.25 modulus Transverse elastic modulus E2 Msi 1.20 2.683 1.49 Major Poisson's ratio 0.26 0.23 0.28 V12 Shear modulus G12 Msi 0.60 0.811 1.040 Ultimate longitudinal (01) ult ksi 154.03 182.75 217.56 tensile strength Ultimate longitudinal (01) ult ksi 88.47 362.6 217.56 compressive strength Ultimate transverse tensile (02) ult ksi 4.496 8.847 5.802 strength Ultimate transverse (02) ult ksi 17.12 29.30 35.68 compressive strength Ultimate in-plane shear strength Longitudinal coefficient of thermal expansion Transverse coefficient of (T12) ult ksi 10.44 9.718 9.863 50 in./in./F 4.778 3.389 0.0111 in./in./F 12.278 16.83 12.5 thermal expansion Longitudinal coefficient of 1 in./in./lb/lb 0.00 0.00 0.00 moisture expansion Transverse coefficient of 2 in./in./lb/lb 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. USCS system used for tables reprinted with permission.