TABLE 3.2 Matrix Properties Parameters Units LM IMLS IMHS HM Polyimide PMR Density 1b/in.3 0.042 0.046 0.044 0.045 0.044 0.044 Modulus 106 psi 0.32 0.50 0.50 0.75 0.50 0.47 Shear modulus 106psi Poisson's ratio 0.43 0.41 0.35 0.35 0.35 0.36 Heat capacity btu/1b/F 0.25 0.25 0.25 025 0.25 0.25 Heat conductivity btu/h/ft2/F/in 1.25 1.25 1.25 1.25 1.25 1.25 Thermal expansion coefficient 10-6in./in./℉ 5 40 20 28 Diffusivity 1010in2/s 0.6 0.6 0.6 0.6 0.6 0.6 Moisture expansion coefficient in./in./M 0.33 0.33 0.33 .33 0.33 0.33 Tensile strength ksi 8 1 2 Compression strength ksi 21 30 16 Shear strength ksi 13 1 Tensile fracture strain in./in.(%) 14 甜 8 201055 2.0 Compressive fracture strain in./in.(% 35 Shear fracture strain in./in.(% 5.0 Air heat conductivity btu/h/ft2/F/in 0.225 0.225 0.225 0.225 .225 0.225 Glass transition temperature (dry) 350 420 420 420 700 700 Note: LM=low modulus:IMLS=intermediate modulus low strength;IMHS=intermediate modulus high strength;HM=high modulus. Thermal,hygral,compression,and shear properties are estimates only;G=E/2(1+v) Source:From Chamis,C.C.,1987,In:Weeton,I.W.,Peters,D.M,and Thomas, K.L eds Engineers Guide Composite Materials.ASM International,Materials Park,OH.With permission. Principles of Composite Material Mechanics ple 3.4,are: Modulus(G12),105 psi Modulus(E),105 psi Solution.The results from equation(3.36),as previously calculated in exam- by the inverse rule of mixtures (eq.[3.361),the method of subregions (eq.[3.501), and Spencer's equation (eq.[3.511). EXAMPLE 3.6 FIGURE 3.9 Multi SC E2 =0.82 x 106 psi (5.65 GPa) For the composite in example 3.4,compare transverse modulus values calculated SMEs for carbon/epoxy.(From Caruso,JJ.and Chamis, Technology and Research,8(3),77-83.With permission.) SME Fiber volume ratio CCMC o MC Fiber volume ratio Multi- 嚣R o MC 品 Single cell Poisson's ratio (v12) Modulus(),10 psi 2 品 8 品 Effective Moduli of a Continuous Fiber-Reinforced Lamina Multi. C.C.1986.Journal of Composites Comparison of 3-D finite element results for lamina elastic constants with predictions from Fiber volume ratio SME 8 04 Single cell Fiber volume ratio 04 Multi- CCMC 0 SME CCMC Single cell