DESIGN OF LAMINATES 



6-81 



X = 1 ~ °TL °LT 



Z = Coordinate measured perpendicular to the middle plane of the panel 



w = Lateral deflection (namely in the Z direction) of points on the 

 middle plane of the panel 



P = Load per in. of edge of panel 



P cr = Buckling load per in. of edge of panel 



K cr = Coefficient in buckling formula 

 For an isotropic material D-jj = Dp, E^ = E^, 

 \ = 1 - a 2 



TL 



° LT = a and 



Constants: 



i *r z 2 dz % h3 

 D i =/ h T = — 



(6.44) 



,2 ^ z 2 dz h h 

 D2=/ h ~ 



3 



12 X 



(6.44a) 



A = E T <J LT + 2X0^ 



(6.45) 



h 



§ X /[ E T z2d! 

 " 2 



(6.46) 



(6.47) 



(6.48) 



(6. 49) 



E 2 = 



h 



2 2 



12 x r Er z dz 



h3 -h ^ 



2 



(6.49a) 



