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3) For a \(60^{\circ}\) angle lamina of graphite/epoxy with \(70 \%\) fiber volume fraction under stresses in global axes as \(\sigma_{\mathrm{x}}=6 \mathrm{MPa}, \sigma_{y}=2 \mathrm{MPa},\) and \(\tau_{\mathrm{w} y}=-4 \mathrm{MPa},\) and using the properties of the given unidirectional lamina from the book, find the followings;

a. Local stresses and strains

b. Principal normal stresses and principal normal strains

c. Maximum shear stress and maximum shear strain


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Answer #1

The Value of Elastic Modulus and Shear Modulus is taken as 10.3 GPa and 7.17 GPa Respectively from the Properties of Graphite Epoxy with 70% Fiber Volume.

given rata 9 a 11 a Angle of Lamina 60° Graphite / Epoxy with 70% Fiber volume 57 = 6MPa . y = ampa - 4uPa try: (a) Local strNow, E= 20300 MPa 6 0.000582 L&x 10300 2 O.DDD 194 Ey = 츠 10300 -4. May - Ezy D. DDD 557 7 C4 7170 ii Local strain CDA 20 + Y2 بعد از دا 2. 2. 4 - 4, 442 - , 92 NP رلها 80 جواد (ع) + (ع) عی په ODD5 240.PDD۱۹ .2 2. 2 2 + b.mp3 82 - D. 60519 +( (-0.000(c) Maximum Shear stress and shear strein. Imax 51-52 5 8.472 - (-0.472) 2 Imay - 2 Imax= 4.472 MPa t Inay €,- € 트라 max D. 00

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