58 3-D textile reinforcements in composite materials 5cm wo'ssaudmau'puoupoo//dny WV St:6Z 2.9 Stiffened panel consisting of braided profiles and warp knitted skins. 2102 Table 2.4.Cost and weight estimates for stiffened panels Material Labour Total Weight (US$) (US$) (US$) (%) 云 Aluminium (milled) 21 11 32 100 Hand-lay-up 45 120 166 70 (unidirectional-prepreg) Automated tape lay-up 29 16 46 70 Integral preform 20 10 30 75 (3-D stitched,RTM) based part seems to represent a good compromise between costs and mechanical performance. In Fig.2.10 the goals,typical structural components and possible appli- cations of textiles for aeroplanes and helicopters are summarized. 2.5 Textile structural composites in automotive structures Table 2.3 summarizes the general requirements that materials for ground- transportation applications have to meet.The most important features arebased part seems to represent a good compromise between costs and mechanical performance. In Fig. 2.10 the goals, typical structural components and possible appli￾cations of textiles for aeroplanes and helicopters are summarized. 2.5 Textile structural composites in automotive structures Table 2.3 summarizes the general requirements that materials for ground￾transportation applications have to meet. The most important features are 58 3-D textile reinforcements in composite materials 2.9 Stiffened panel consisting of braided profiles and warp knitted skins. Table 2.4. Cost and weight estimates for stiffened panels Material Labour Total Weight (US$) (US$) (US$) (%) Aluminium (milled) 21 11 32 100 Hand-lay-up 45 120 166 70 (unidirectional-prepreg) Automated tape lay-up 29 16 46 70 Integral preform 20 10 30 75 (3-D + stitched, RTM) RIC2 7/10/99 7:25 PM Page 58 Copyrighted Material downloaded from Woodhead Publishing Online Delivered by http://woodhead.metapress.com Hong Kong Polytechnic University (714-57-975) Saturday, January 22, 2011 12:29:45 AM IP Address: 158.132.122.9