Micromechanical Analysis of a Lamina 211 =0.5688×10-3m3. The mass of the fiber is Wf=Prof =(2500)1.327×10-3) =3.318k8. The mass of the matrix is Wm =PmUm =(1200)(0.5688×10-3) =0.6826kg. 3.2.4 Void Content During the manufacture of a composite,voids are introduced in the com- posite as shown in Figure 3.2.This causes the theoretical density of the composite to be higher than the actual density.Also,the void content of a FIGURE 3.2 Photomicrographs of cross-section of a lamina with voids. 2006 by Taylor Francis Group,LLCMicromechanical Analysis of a Lamina 211 . The mass of the fiber is . The mass of the matrix is = 0.6826 kg . 3.2.4 Void Content During the manufacture of a composite, voids are introduced in the com￾posite as shown in Figure 3.2. This causes the theoretical density of the composite to be higher than the actual density. Also, the void content of a FIGURE 3.2 Photomicrographs of cross-section of a lamina with voids. = × − 0 5688 10 3 3 . m w v f f = ρ f = × − ( ) 2500 (1.327 10 ) 3 = 3.318 kg w v m m = ρ m = × − ( ) 1200 (0.5688 10 ) 3 1343_book.fm Page 211 Tuesday, September 27, 2005 11:53 AM © 2006 by Taylor & Francis Group, LLC