0,=-3 MPa xy=4 MPa = 2 MPa Find the following for a 60 angle lamina (Figure 2.21) of graphite/epoxy. Use the properties of unidirectional graphite/epoxy lamina from Table 2.1. 1. Transformed compliance matrix 2. Transformed reduced stiffness matrix If the applied stress is = 2 MPa, = -3 MPa, and y = 4 MPa, also find 3. Global strains 4. Local strains 5. Local stresses Transverse elastic modulus Major Poisson's ratio Shear modulus Ultimate longitudinal tensile strength Ultimate longitudinal 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 E Msi 1.20 2.683 1.49 012 0.26 0.23 0.28 G12 Msi 0.60 0.811 1.040 () ksi 154.03 182.75 217.56 (oile ksi 88.47 362.6 217.56 compressive strength Ultimate transverse tensile (a) ksi 4.496 8.847 5.802 strength Ultimate transverse (a) ksi 17.12 29.30 35.68 compressive strength Ultimate in-plane shear (112) ksi 10.44 9.718 9.863 strength Longitudinal coefficient of in./in./F 4.778 3.389 0.0111 thermal expansion Transverse coefficient of in./in./F 12.278 16.83 12.5 thermal expansion Longitudinal coefficient of B in./in./lb/lb 0.00 0.00 0.00 moisture expansion Transverse coefficient of B in./in./lb/lb 0.60 0.60 0.60 moisture expansion