Question

5.30 La composite material, an epoxy matrix is reinforced with GY-70 Cype graphite fibers. The volumne percentage of fibers is 70%, and all are oriented in the same direction. For a sheet of this material in the X-Y planc, with fibers in the X-direction, strains $x = 0.005 and $y = 0.001 are measured. Estimate the applied stresses Ox and Oy

Answer 1

solution hiven Data ; GY-70 Erraphite Fiber volume of fiber = 70% In x-y plane, Strain Ex=0.00.50 Ey = 0.0010 To find :- Applied stresses Je and Ty - so, Vo = 0.70 Vm = 0.30 Te is the longitudinal direction Jx = Jm Vm + TA VE - i Em

Ex= Em Vm 7 EF VE Es = 5316 Pa = Ev) Ey = 3.510.3) +531 10.7) = 1.05+ 37117 Ex = 372.75 Copa = 372.75X0.005 Joe = 1.86 G Pa composite Ty is transverse setting stress in the Jy = Jp = Tm Ey - Ey = EF Em Evm + Em Vf = 5318 35 531% 0.3 + 315 8017 Ey = 11.54 Pa

= Ey Ey = 11.54 X 0.001 Ty = 11.5 MP 7 Hence, and Ty=1lish Tx = 1.86 Cola Applied stresses