1.11 (a) A test piece is cut from a brass bar and subjected to a tensile test. With a load of 6.4 kN the test piece, of diameter 11.28 mm, extends by 0.04 mm over a gauge length of 50 mm. Determine: (i) the stress, (ii) the strain, (hi) the modulus of elasticity. (b) A spacer is turned from the same bar. The spacer has a diameter of 28 mm and a length of 250mm. both measurements being made at 20°C. The temperature of the spacer is then increased to 100°C, the natural expansion being entirely prevented. Taking the coefficient of linear expansion to be 18 x 10-6/"C determine: (i) the stress in the spacer, (ii) the compressive load on the spacer. [C.G.] [64MN/m2, 0.0008, 80GN/m2, 115.2 MN/m2, 71 KN.] 10:41

Elements Of Electromagnetics
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1.11 (a) A test piece is cut from a brass
bar and subjected to a tensile test.
With a load of 6.4 kN the test piece, of
diameter 11.28 mm, extends by 0.04
mm over a gauge length of 50 mm.
Determine:
(i) the stress, (ii) the strain, (hi) the
modulus of elasticity.
(b) A spacer is turned from the same
bar. The spacer has a diameter of 28
mm and a length of 250mm. both
measurements being made at 20°C.
The temperature of the spacer is
then increased to 100°C, the natural
expansion
being entirely prevented. Taking the
coefficient of linear expansion to be 18
x 10-6/"C determine:
(i) the stress in the spacer, (ii) the
compressive load on the spacer.
[C.G.] [64MN/m2, 0.0008, 80GN/m2,
115.2 MN/m2, 71 KN.]
10:41
Transcribed Image Text:1.11 (a) A test piece is cut from a brass bar and subjected to a tensile test. With a load of 6.4 kN the test piece, of diameter 11.28 mm, extends by 0.04 mm over a gauge length of 50 mm. Determine: (i) the stress, (ii) the strain, (hi) the modulus of elasticity. (b) A spacer is turned from the same bar. The spacer has a diameter of 28 mm and a length of 250mm. both measurements being made at 20°C. The temperature of the spacer is then increased to 100°C, the natural expansion being entirely prevented. Taking the coefficient of linear expansion to be 18 x 10-6/"C determine: (i) the stress in the spacer, (ii) the compressive load on the spacer. [C.G.] [64MN/m2, 0.0008, 80GN/m2, 115.2 MN/m2, 71 KN.] 10:41
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