Such curves are plotted in Figure 4 (dashed line) for the aluminum 

 array and above specified Special Flexible Hoisting wire rope. The maximum 

 tolerable dynamic stress is 32, 000 psi, about one-sixth of the ultimate strength 

 of this cable. The values of 8 assumed are stated on the curves. Notice that 

 more friction moves the curve to the right. Assuming that B = 0.05 | U 1 , 



we see that at u) = 2 rad/sec the maximum dynamic stress in the cable will 



not exceed 32,000 psi as long as | U | is equal to or less than 1 .7 feet and so 



on for other frequencies. If p = 0. 1 1 U | , then for the same frequency the 



maximum allowed | U | is 3 feet. 



23 



artbur B.llittleJnt. 



S-7001-0307 



