TABLE 7. TEST FOR STRETCH CHARACTERISTICS OF PRELOADED WIRE 

 CABLE 7 X 7D, SPECIMEN 475, 3/32" DIAMETER, REEL 34894 

 (100-FT LENGTH) 





Number of Turns 



Time 







Load 



To To 



From Start 



Stretch 





(lb) 



Unwind Wind 



(hr) 



(in. /50 ft) 



Notes 



292 



10.0 



1.0 









Data required were limited to 

 stretch characteristics after 

 preload; therefore, the prelimi- 





Load raised 50 feet 



48 



0.25 



nary stretch measurement was 





Load lowered 50 feet 



72 



0.63 



not taken. 





37.0 











5.0 



168 



0.63 



0.75 





196 







-0.16 



As the load was lightened, the 





Load raised 50 feet 



192 



-0.35 



reduction in elongation indicated 





Load lowered 50 feet 



216 



-0.57 



a zero elongation at 100 lb. 





18.75 











2.5 



240 



-0.50 





100 



Load raised 50 feet 

 Load lowered 50 feet 



264 

 336 

 360 



-1.69 

 -1.66 













0.12 



Permanent stretch. 



21 



