6. Compute the stiffness matrix ([A], [B], [D]) for a [0/90] laminate with the following lamina prop E₁ =145 x10" Pa E22=10.45 x10" Pa G₁₂-7.0 x10° Pa V12-0.28 -0.25 mm (lamina thickness) Typical Mechanical Properties of a Unidirectional Lamina (SI System of Units) Glass/ Boron/ Property Symbol Units ероху epoxy Graphite/ ероху Fiber volume fraction V₁ 0.45 0.50 0.70 Longitudinal elastic modulus E₁ 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 GPa 4.14 5.59 7.17 Ultimate longitudinal tensile (0) MPa 1062 1260 1500 strength Ultimate longitudinal (ai) MPa 610 2500 1500 compressive strength Ultimate transverse tensile (a) MPa 31 61 40 strength Ultimate transverse (a) MPa 118 202 246 compressive strength Ultimate in-plane shear (512) MPa 72 67 68 strength Longitudinal coefficient of α μm/m/°C 8.6 6.1 0.02 thermal expansion Transverse coefficient of α um/m/°C 22.1 30.3 22.5 thermal expansion Longitudinal coefficient of B₁ m/m/kg/kg 0.00 0.00 0.00 moisture expansion Transverse coefficient of B₂ m/m/kg/kg 0.60 0.60 0.60 moisture expansion ene B