5-40 



ENGINEERING PROPERTIES OF LAMINATES 



DURATION OF LOAD - HOURS 



Fig. 5-19. Shear Strength Retention of Continuously 

 Loaded Polyester Fiberglass Laminates 



1o J 10 10 



CYCLES TO FAI LURE 



Fig. 5-20. Shear Fatigue Strength of Low Density 

 Core Materials - Dry Condition 



