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11. What's torsion deformation?

8.10 Problems

A load of 500 kg, hanging from a steel wire of length 3 m and
2
cross section ,0 2cm increased the length of the wire in ,0 4 cm
compared with non- loaded length . What were the stress, the strain,
and the value of Young's modulus for the steel of which that wire

was composed?
Solution
1.Stress
m
( 500 kg ()  8 , 9 )
F s 2 8
    , 2 45 10 Pa (8.11)
S 2  10  5 m 2
2.Strain

l , 0 004m
   , 0 00133 (8.12)
l 0 3m
3.Young's modulus

8
 , 2 45 10 Pa 11
E    , 1 84 10 Pa (8.13)
 , 0 0013

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