6-76 



DESIGN OF LAMINATES 



J 



WOVEN ROVI NG 



0.1 48" 



s; 



Fig. 6-42. Equivalent Stiffener and Plate Section 



Equivalent ividth of cloth lamina: 



1.95 



b' 



cl 



J cl 



5a = 



S.O x 



2.06 



7.573 in. 



Equivalent width of mat lamina: 



b' 



m 



= \ x 



EWR 



5.0 x 



0.91 

 2.06 



3.531 



in. 



(6.38b) 



(6.38b) 



Equivalent woven roving laminate moment of inertia and section moduli to the face 

 furthest from the neutral axis of the cloth, mat and woven roving laminae are obtained from 

 equations 6.40 and 6.41. 



Calculation of properties of section: 



A'x 



A'x2 



Io 



A'X^ + Io 



3.293 



0.0010 



0.0098 0.0005 0.0001 



0.1776 0.0266 0.0022 



0.1764 0.0526 0.0011 



0.7113 0.9233 0.1567 



1.4615 3.3585 0.0012 



2.5376 

 X A'x2 = 1.9565 



I' 



MA 



0.0006 

 0.0288 



0.0537 

 1. 0800 



3.3597 



4.5228 

 1.9565 



2. 5663 in 4 



