A 4-m-long steel plate with a rectangular cross section (10 mm × 50 mm) is resting on a frictionless surface under the sun. The plate temperature is measured to be at 40°C. The plate is then moved into a cold room and is left to rest on a frictionless surface. After several hours, the plate temperature is measured to be at 5°C. The steel has a modulus of elasticity equal to 200,000 MPa and a coefficient of thermal expansion equal to 1.1 × 10–5 m/m/°C.
a. What is the length of shrinkage?
b. What tension load is needed to return the length to the original value of 4 meters?
c. What is the longitudinal strain under tills load?
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