Question

4. Assume that you have a unidirectional, glass/polyester composite with the following constituent properties and 70% volume loading of fiber: Ec=70 GPS Ex= 3.5 GPS V=0.2 Vm=0.35 0.6-0.5 x 10-5°C a = 9.0 x 10-5/°C Calculate the values of El, Vz, Olt, and as using the rule-of-mixtures relationships

Answer 1

4. Given VHF 0.7. Vm= 1-V4 = 0.3. Eg= To apa. Em - 3.5cpa. Y • • • um = 0.35 24 = 0.5X105/°C. &m= 9.0 x10-5/°C. . for modulus along longitudinal direction. El= Vm Em + Vf. Eg. solution Ele 0.37 3.5 + 0.7 x 70 · | Eu= 5005 apal Poisson's ration along longitudinal direction. V = Vf. VF + im. Vm. N = 0.2 X07 + 0.35 x 0.3 · | Un = 0.245

Thermal Expansion along longitudinal direction. (QfEt. Yt + Am Em Ym). di C0.5x10-5x70 X 0.7 + 9x108x3.5 x 0.3). 50.05 101 = 6.70X106 /°C Thermal Expansion along transverse direction. 27 = 24 V8 (1+ ug) + Am Ym litum) - div. = 0.5x105x0.7 (170.23 +9x105 X0-3(1+0-35) -6.78x17x 0.245 27 = 3.898 X10-5 / och

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