A steel bar 600mm long and having 30mm diameter, is turned down to 25mm diameter for one fourth of its length. It is heated at 30 °C above room temperature, clamped at both. ends and then allowed to cool to room temperature. If the distance between the clamps is unchanged, the maximum stress in the bar (a = 12.5 x 10-6/°C and E = 200 GN/m²) is

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A steel bar 600mm long and having
30mm diameter, is turned down to
25mm diameter for one fourth of its
length. It is heated at 30 °C above
room temperature, clamped at both
ends and then allowed to cool to room
temperature. If the distance between
the clamps is unchanged, the
maximum stress in the bar (a = 12.5 x
10-6,°c and E = 200o GN/m3) is
75 MPa
25 MPa
40 MPa
50 MPa
Transcribed Image Text:A steel bar 600mm long and having 30mm diameter, is turned down to 25mm diameter for one fourth of its length. It is heated at 30 °C above room temperature, clamped at both ends and then allowed to cool to room temperature. If the distance between the clamps is unchanged, the maximum stress in the bar (a = 12.5 x 10-6,°c and E = 200o GN/m3) is 75 MPa 25 MPa 40 MPa 50 MPa
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