The segment AB of the steel torsion bar is a cylindrical tube of constant 2-mm wall...

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The segment AB of the steel torsion bar is a cylindrical tube of constant 2-mm wall thickness. Segment BC is a square tube with a constant wall thickness of 3 mm. The outer dimensions of the cross sections are shown in the figure. The tubes are attached to a rigid bracket at B, which is loaded by a couple formed by the forces P. Determine the largest value of P if the shear stress in either tube is limited to 60 MPa. 1.2m 80 mm B -t = 2 mm 1.2 m FIG. P3.47 100 mm 300 mm -1 = 3 mm The segment AB of the steel torsion bar is a cylindrical tube of constant 2-mm wall thickness. Segment BC is a square tube with a constant wall thickness of 3 mm. The outer dimensions of the cross sections are shown in the figure. The tubes are attached to a rigid bracket at B, which is loaded by a couple formed by the forces P. Determine the largest value of P if the shear stress in either tube is limited to 60 MPa. 1.2m 80 mm B -t = 2 mm 1.2 m FIG. P3.47 100 mm 300 mm -1 = 3 mm

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