641
METAL FROM ROTATING SHAFTS-
No. 7366.
Marks, T
Endurance test No. 311. See Report, 1899, p. 855. Diameter, ".564.
Sectional area, .25 square inch.
Gauged length, 3".
Remarks.
Initial load.
Elastic limit.
Tensile strength.
Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.
Inch. 0. .000100 .000300 .000633 .000967 . 001300 .001633 .001900 .018967 .020500 .022333 .026333 . 033667 .043833 .055667 .080	Inch. 0. .000100 . 000200 .000333 .000334 .000333 .000333 .000267 .017067 . 001533 .001833 .004000 .007334 . 010166 .011834 .024	Inch. 0. 0.	Inch. 0. 0.
			
			
		0.	0.
			
			
			
			
			
			
			
			
			
			
			
Applied loads per square inch.
Pounds. 1,000 5,000 10,000 20,000
30.000
40.000
50.000
58.000
59.000
60.000 62,000
64.000
68.000
72.000
76.000
80.000 85,360
General summary.
Tensile strength per square inch of original section............................pounds.. 85,360
Elastic limit per square inch of original section................................do... 59,000
Elongation per inch after rupture...............................................inch..	. 2633
Elongation per inch under strain at elastic limit................................do... . 018967
Reduction in diameter at point of rupture........................................do...	. 204
Reduction in area after rupture, per cent of original section......................... 59.3
Position of rupture.............................................................154,״ from neck
Character of broken surface.............................................. fine silky, cup shaped
Elongation of inch sections..................................................... ".21, '15." ,*43.׳
H. Doc. 508----41