Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 5 (Q.No. 45)
45.
A mild steel bar of square cross-section 40 mm x 40 mm is 400 mm long. It is subjected to a longitudinal tensile stress of 440 N/mm2 and lateral compressive stress is 200 N/mm2 in perpendicular directions. E = 2 x 10-5 N/mm2, μ = 0.3. What is the approximate elongation of tht bar in the longitudinal direction ?
Discussion:
1 comments Page 1 of 1.
Vai said:
8 years ago
longitudinal tensile stress, fx = 440 MPa. Lateral Stress, fy = fz = -200 MPa (negative because compressive).
Longitudinal strain, ex = (fx/E)-(m*fy/E)-(m*fz/E) = (440/2*10^5)+(2*0.3*200/2*10^5) =0.0028.
Elongation= 0.0028*400 = 1.12 mm.
Longitudinal strain, ex = (fx/E)-(m*fy/E)-(m*fz/E) = (440/2*10^5)+(2*0.3*200/2*10^5) =0.0028.
Elongation= 0.0028*400 = 1.12 mm.
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