Problem 2.12-7A circular steel rod ABof diameter d 0.60 in. isstretched tightly between two supports so that initially the tensile stressin the rod is 10 ksi (see figure). An axial force Pis then applied to therod at an intermediate location C. (a) Determine the plastic load PPif the material is elastoplasticwith yield stress Y 36 ksi. (b) How is PPchanged if the initial tensile stress is doubled to 20 ksi?Solution 2.12-7Bar held between rigid supportsSECTION 2.12Elastoplastic Analysis175BAdBP ACd0.6 in.Y36 ksiInitial tensile stress 10 ksi(a) PLASTIC LOADPPThe presence of the initial tensile stress does notaffect the plastic load. Both parts of the bar mustyield in order to reach the plastic load.POINTC:(B) INITIAL TENSILE STRESS IS DOUBLEDPPisnotchanged.20.4kPP2sYA(2)(36ksi) ¢4≤
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