DESIGN OF LAMINATES 



6-47 



x-|_, X2 and x-j from woven roving face. 



2. Ij6xl0 6 x0. 375x0. 5313 * 0.93xl0 6 x2. 250x0.3125 + 2.1i$xl0 6 x0.750x0.0625 

 2.U6xl0 6 x0.375 + 0.93xl0 6 x2.250 + 2 . Ii5xl0 6 x0 . 750 



x = 0.226 from face of woven roving. 



Solving for E: 



E = i Ye. A. 



AC li 



■-xx 



Cloth 



0.375 



Mat 



2.250 



(6.26) 



W.R. 



2.U6 x 10 6 0.93 x 10 6 2.15 x 10 6 



1.22 x 10-6 26U x 10-^ 977 x 10" 6 



0.750 



EA 



2.1i6xl0 6 x0.375 + 0.93xl0 6 x2.250 + 2.i;5xl0 6 x0.750 

 2.967 x 10 6 



2.967 x 10 6 



3.375 



0.879 x 10 6 psi 



Solving for EI 



EI 



xx 



E.I, 



1 ixx 



(6.25) 



EIxx = 2. U6xl0 6 (122xl0 6 +0. 375x0. 3053 2 ) + 0. 93x10(261; x 10 -6 + 2.250 x 0.0865 2 ) 

 +2.U5xl0 6 (977xlO +0. 750x0. 1635 2 ) 

 = 178002 lbs-in? 



= 0.2025 inU 



L xx ~ z 



0.879x10 



L yy " t^e 



t l 3 l + t 2 E 2 + t 3 E 3 

 63 



(6.28) 



12x0.879xlO 6 



0625x2.U6xl0 6 +. 375x0. 93xl0 6 +. 125x2. I45xl0 6 



16.567 in' 



li 



