Each of the four vertical links has an 8 x 36-mm uniform rectangular cross section and cach of the four pins has a 16-mm diameter. Determine the maximum value of the average normal stress in the links connecting (a) points B and D, (b) points C and E. PROBLEM 1.27 For the assembly and loading of Prob. 1.7, determine (a) the average shearing stress in the pin at B, (b) the average bearing stress at B in member BD, (c) the average bearing stress at B in member ABC, knowing that this member has a 10 x 50-mm uniform rectangular cross section.

Problem 8.12 A bar of rectangular cross-section, with a width of 60 mm and a thickness of 40 mm, is bent in the shape of a horse shoe having a mean radius of 70 mm. Two equal and opposite forces of 10 kN each are applied at a distance of 12 cm from the centre line of the middle section so that they tend to straighten the rod. Find the maximum ten- sile and compressive stresses and construct a diagram showing the vari- ation of the normal stresses over the central section.

An annular washer distributes the load P applied to a steel rod to a timber support. The rod's diameter is 22 mm, and the washer's inner diameter is 25 mm, which is larger than the hole's permissible outer diameter. Knowing that the axial normal stress in the steel rod is 35 MPa and the average bearing stress between the washer and the timber must not exceed 5 MPa, examine the smallest allowed outer diameter, d, of the washer. %3D %3D +22 mm P Figure 4

1.14 Two hydraulic cylinders are used to control the position of the robotic arm ABC. Knowing that the control rods attached at A and D each have a 20-mm diameter and happen to be parallel in the position shown, determine the average normal stress in (a) member AE, (b) member DG. 400 mm E -300 mm- A F 150 mm 150 mm 200 mm B 600 mm- 800 N C

Link AC is made of a steel with a 65-ksi ultimate normal stress and has a xin. uniform rectangular cross section. It is connected to a support at A and to member BCD at C by-in.-diameter pins, while member BCD is connected to its support at B by a -in.-diameter pin. All of the pins are made of a steel with a 25-ksi ultimate shearing stress and are in single shear. Knowing that a factor of safety of 3.75 is desired, determine the largest load P that can be applied at D. Note that link AC is not reinforced around the pin holes. 16 IN 8 in 16. ---4 in- The largest load P that can be applied at Dis[ lb.

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PROBLEM 1.2 Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Knowing that d = 50 mm and dz = 30 mm, find the average normal stress at the midsection of (a) rod AB, (b) rod BC. 300 mm 40 kN 250 mm V30 KN

1.26 part A thanks