Question: A stepped bar ACB with circular cross sections is held between rigid supports and loaded by an axial force P at midlength (see figure). The

A stepped bar ACB with circular cross sections is held between rigid supports and loaded by an axial force P at midlength (see figure). The diameters for the two parts of the bar are d1 = 20 mm and d2 = 25 mm, and the material is elastoplastic with yield stress ÏƒY = 250 MPa.
Determine the plastic load PP.

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