(2) A composite member is made of a hollow brass cylinder (E 105 GPa, v= 0.32, and a = interference fit over ASTM-A242 solid steel rod (E = 200 GPa, v= 0.3, and a = 11.7x10/°C). The outer radius of brass is 100 mm, the inner radius is 50 mm, and the outer radius of steel is 50.05 mm. The length of both is the same (This implies NO STRESS CONCENTRATION FACTOR involved). Compute (a) the total radial interference of the brass and (b) the temperature difference AT required to easily slip the brass cylinder over the steel rod. For easy insertion, allow a clearance of ½&, see slide 16 of Lecture 9 notes. (Hint: First calculate total interference (8 + ½8), then use definition of a (defined in Lecture 6, slide 26). (c) Compute the interface pressure p of the interference fit at room temperature (use the actual radial interference for this; that is, without clearance). 20.0x10*/°C) Fig. 2

I got wrong answer last time I posted. Please do it correctly.

2. 1.5 m 3 m 400N 200 N 1 m Member AB is supported by a cable BC and at A by a square rod which fits loosely through the square hole in the collar fixed to the member as shown. Which of the following is closest to the force in cable BC?

Assuming a welded rail line, 1km long, that is unconstrained except at the ends. The rail has a cross sectional profile as given. If the rail was installed at a temperature of 20°C, at what temperature would the rail buckle? How much pre-stress would need to be applied to the rail in order to prevent buckling up to a maximum operating temperature of 40°C? Rail profile 46E1 Equivalent profile name SBBI Section weight kg/m 46.17 Rail height mm (H) 145.00 X Y Y Head width mm (C) 65.00 A H Web thickness mm (A) 14.00 Foot width mm (P) 125.00 Moment of inertia, Ixx cm* 1641.10 Moment of inertia, lyy cm* 298.20