Engineering Board Exam Reviewer · Strength of Materials · medium
A steel bar (E = 200 GPa, = 12 × 10-6 /° C) is held rigidly between two fixed walls so that it cannot expand. What compressive stress develops when its temperature rises by 30°C?
- 36
- 2.4
- 72
- 144
Answer
C. 72
Solution
With expansion fully prevented, = E T = (200,000 MPa)(12 × 10-6)(30) = 72 MPa (compressive).
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