Fig 7. 
  
A typical fringe pattern observed 
during reconstruction of a double- 
exposure hologram recording the 
airfoil No. 1 acted upon by a radial 
(tensile) load applied at tip of 
the blade 
28 
——— FINAL POSITION- £ 
HOLOGRAPHIC os. 
ANALYSIS "s 
Fig 8. 
     
— INITIAL. POSITION 
  
Deflections of airfoil No. 1, due to 
tensile load applied at tip, as 
determined from holograms at level 26 
  
  
1 À L 1 1 
-05 ^. -03 -0.2 -0.I 
rT 
——— FINAL POSITION - 03 
HOLOGRAPHIC ANALYSIS “" 
—-— FINAL POSITION - 
FINITE ELEMENT 0.4 
ANALYSIS 
Fig 9. 
  
    
INITIAL POSITION 
0.5 
Deflections of airfoil No. 
tensile load, at level 11; 
a comparison of displacements 
determined from holograms and those 
predicted by finite element analysis 
1 due to