A solid 45 mm diameter beryllium copper (E = 131 GPa; α = 17.0 × 10−6 /°C) rod is stress free when securely attached to the unyielding supports shown in the figure below.  If the compressive normal stress in the rod must not exceed 450 MPa, what is the maximum temperature increase (rounded down to the nearest degree) that can be allowed for the rod? Use L1 = 300 mm

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