Part A - Calculate Poisson's ratio

A square steel bar has a length of 5.4 ft and a 2.8 in by 2.8 in cross section and is subjected to axial tension. The final length is 5.40314 ft . The final side length is 2.79940 in . What is Poisson's ratio for the material?

Part B - Calculate the load

A square steel bar has a length of 3.6 ft and a 1.3 in by 1.3 in cross section and is subjected to axial compression. Under load, the thickness becomes 1.30019 in . If the modulus of elasticity is E = 2.9×104 ksi and Poisson's ratio is ? = 0.27; what is the magnitude of the load that was applied to the bar?

Part C - Maximum load

A slider with a square hole is mounted on the bar described in part B (Figure 1) . The largest load the bar ever carries is 68 kip . What is the minimum side length of the square hole so that it will not bind on the bar?

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?