MET 211, Applied Strength of Materials
HW 2
2-68. Use Curve C from Figure P2–66. Final length between gage marks = 2.30 in. Determine
the following properties of the material:
a. Yield strength. State whether the yield point is used to determine this value or if the
0.2% offset method is used.
b. Ultimate tensile strength.
c. Proportional limit.
d. Elastic limit.
e. Modulus of elasticity for the range of stress in which Hooke’s law applies.
f. Percent elongation. (The gage length for each test is 2.00 in.)
g. State whether the material is ductile or brittle.
h. Examine the results and judge the kind of metal used to determine the test data.
i. Compare your results and find a particular alloy from Appendix tables A–10 through A–
14 that has similar properties.
3-9. A shelf is being designed to hold crates having a total mass of 1840 kg. Two support rods
like that shown in Figure P3–9 will hold the shelf. Assume that the center of gravity of the
crates is at the middle of the shelf. Specify the required diameter of the circular rods to limit
the stress to 110 MPa.
3-16. A portion of a casting made of ASTM A48, grade 20 gray cast iron has the shape shown in
Figure P3–16 and is subjected to compressive force in line with the centroidal axis of the
section. If the member is short and carries a load of 52 000 lb, compute the stress in the section
and the design factor. Take ultimate strength value of 80 ksi.
3-19. Figure P3–19 shows the cross section of a short compression member that is to carry a
static load of 640 kN. Specify a suitable material for the member (Find from the text Appendix).
3-32. A cylindrical steel bar is attached at the top and is subjected to three axial forces, as
shown in Figure P3–32. Its cross section has an area of 0.50 in2. Determine the deflection of the
free end. Take E of the steel bar is 30 x 106 psi.
3-37. Compute the total elongation of the bar shown in Figure P3–37 if it is made from titanium
Ti – 6Al – 4V.