186 APPLIED MECHANICS 
° 40 Litt 9 ! 2 3 4 _§ inches. 
S 5s || _| | Scale tor Elongations, (in 8 inches) 
, VWWGae “The dotted line shows the yield-points. 
he 
Ss ' /2/ L > a a mee . 
& 2 ii fo A A ‘ 
Es H “ AAA P et PP ee 
8 10 it Pe {! f. P4 ee 
i; EY 
oe EE BT a SE ee 0 
Aluminium per cent 
Fig. 260 
The results of torsion tests on a number of these alloys are shown 
plotted in Fig. 261. 
TORSION TESTS. 
s STRESS — STRAIN DIAGRAMS 
at] _'3 Ae Bars rolled to 1%" diameter. 
ees 
4 VA 
0-67 
0-44 
j NE of Moy, I 2 3 5 8 9 13 15 
02 ium %\ 0-10 1:06 | 2:10 | 4:05 | 6-73 7-35 9-90 | I-73 
; le| of Twist in Degrees 
5 590 1090 sa ‘si eo 350 __ 4900 or 5000 
) tg (Se 8 8 0 HN 4 
ye if Twist = fom: 
Fie. 261. 
176. Tables of Strength and Elasticity of Materials.—The tables 
which follow give approximate average values of the ultimate strength — 
and modulus of elasticity of various materials, 
Ultimate Crushing Strength in Tons per Square Inch. 
Cast-iron : . . : . 45 | Granite 6 
Brass, cast . ‘ : ; . 5 | Brick, London stock i 1 
Timber . ; i : ; Pee ;, Staffordshire blue 3 ot 
Sandstone. * : : . 31] Concrete. : : 05 
