METAL FROM ROTATING- SHAFTS.
640
No. 7369.
Marks, 2 C 2.
Endurance test No. 307. See Report, 1899, p. 855. Diameter, ".564.
Sectional area, .25 square inch.
Gauged length, 3".
Remarks.
Initial load.
Elastic limit.
Tensile strength.
Successive permanent set.
Permanent set.
Inch.
0.
0.
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.
Pounds.	Inch.	Inch.
1,000	0.	0.
5,000	.000133	.000133
10,000	.000333	.000200
20,000	.000667	. 000334
30, 000	. 001000	.000333
40,000	.001333	. 000333
48,000	.001633	. 000300
49,000	. 027000	.025367
50,000	. 028300	. 001300
52,000	. 031667	.003367
54,000	. 036000	.004333
56,000	.041167	. 005167
60,000	.054667	. 013500
64,000	.077	.022
68,000 71,520	.103	.026
		
General summary.
Tensile strength per square inch of original section...........................pounds..	71,520
Elastic limit per square inch of original section.................................do...	48,000
Elongation per inch after rupture...........־....................................inch..	. 3000
Elongation per inch under strain at elastic limit.................................do...	. 001633
Reduction in diameter at point of rupture.........................................do...	.204
Reduction in area after rupture, per cent of original section......................... 59.3
Position of rupture...........................................................1".45 from neck
Character of broken surface............................................. fine silky, cup shaped
Elongation of inch sections...................................................".18, ", 44*, 28 .״