210 Mechanics of Composite Materials,Second Edition 2500 W22110 0.3 =0.8294 1200 Wm ×0.3 2110 =0.1706 Note that the sum of the mass fractions, W+Wnm=0.8294+0.1706 =1.000. 3.The volume of composite is 0e= We 4 2110 =1.896×10-3m3. 4.The volume of the fiber is Uf=VyUc =(0.7)1.896×10-3) =1.327×10-3m3. The volume of the matrix is Um=Vmve =0.3)0.1896×10-3) 2006 by Taylor Francis Group,LLC210 Mechanics of Composite Materials, Second Edition . Note that the sum of the mass fractions, 3. The volume of composite is . 4. The volume of the fiber is . The volume of the matrix is Wf = × = 2500 2110 0 3 0 8294 . . Wm = × = 1200 2110 0 3 0 1706 . . W W f m + = + = 0 8294 0 1706 1 000 . . . . v w c c c = ρ = 4 2110 = × − 1 896 10 3 3 . m v V f f = vc = × − ( . 0 7)(1.896 10 ) 3 = × − 1 327 10 3 3 . m v V m m = vc =(0.3)(0.1896 × − 10 3 ) 1343_book.fm Page 210 Tuesday, September 27, 2005 11:53 AM © 2006 by Taylor & Francis Group, LLC