DESIGN OF LAMINATES 6-189 



Facings - 10 ounce cloth - polyester laminate 



E xf = 1.60 x 10 6 psi (Table 5-10) 



E f = 1.52 x 10° psi 



°xyf = 0,2 ° (Average of Tables 5-8 and 5-12) 



n , = »2° 



a yxf 



G-xyf = 0.52 x 10 6 psi (Table 5-14) 



(Reference 23) 



(Reference 23) 



Two alternative methods of analysis have been evaluated; the first considering the fac- 

 ings only effective and using the usual panel formula corrected for orthotropicity of the fac- 

 ing, Tables 6-19 and 6-2 0, the second considering a 1 in. wide strip of the panel as a beam 

 in accordance with the simplified method of analysis (No. 5) previously discussed. 



The results of the investigation of the deflection and the bending moments are summa- 

 rized below. 



Summary of Panel Deflections 

 Method of Analysis Deflection 



Balsa Core Foamed Plastic Core 



Exact 0.0033 in. 0.0038 in. 



Normal Panel Formulas 0.00102 in. 0.00102 in. 



Simple Beam 0. 0043 in. 0.0048 in. 



