A round brass bar of diameter d1 = 20 mm has upset ends of diameter d2 = 26 mm (see figure). The lengths of the segments of the bar are L1 = 0.3 m and L2 = 0.1 m. Quarter-circular fillets are used at the shoulders of the bar, and the modulus of elasticity of the brass is E = 100 GPa.
If the bar lengthens by 0.12 mm under a tensile load P, what is the maximum stress σmax in the bar?

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d2 26 mm d 20 mm Probs.2.10-4 and 2.10-5