A steel bar of 40mm x 40mm square cross-section is subjected to an axial compressive load of 200kN. If the length of the bar is 2m and E=200GPa, the elongation of the bar well be ____________
A. 1.25mm
B. 2.70mm
C. 4.05mm
D. 5.40mm
Answer:A
A steel bar of 40mm x 40mm square cross-section is subjected to an axial compressive load of 200kN. If the length of the bar is 2m and E=200GPa, the elongation of the bar well be ____________
A. 1.25mm B. 2.70mm C. 4.05mm D. 5.40mm
Explanation: Elongation of the bar = Pl/AE = -200x103x 2000 / ( 1600 x 200 x 103) = -1.25 The minus sign here shows that the stress here is compressive.