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Thermal properties A bar has an initial length of 100 mm at room temperature of 27oC. The...

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Mechanical Engineering

Thermal properties

A bar has an initial length of 100 mm at roomtemperature of 27oC. The tensile test indicates that the bar yieldswhen it reaches is the stress level of 145 MPa and the strain valueof 2.071 x 10-3. The bar is later placed in an oven and heated fromroom temperature to 100 oC. The linear coefficient of thermalexpansion of the material is 23 x 10-6 oC-1 at 27oC, and 34 x 10-6oC-1 at 527oC. Determine:

a. What is the linear coefficient of thermal expansionat 100 oC?

b. What is the length of the bar in millimeter at 100oC?

c. Does the heating from room temperature to 100 oCthe cause the bar to yield

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