Question

 1. Draw a schematic stress-strain diagram for steel. Make sure you mark all the important points and regions on it. Provide a one-two sentence explanation for each point and region along the diagram.  

 2. A cylindrical specimen of a nickel alloy having an elastic modulus of 207 GPa (30 x 10* psi) and an original diameter of 10.2 mm (0.40 In.) will experience only elastic deformation when a tensile load of 8900 N (2000 Ibe) is applied. Compute the maximum length of the specimen before deformation if the maximum allowable elongation is 0.25 mm (0.010 In.).

 3. Consider the brass alloy for which the stress-strain behavior is shown in the figure on the right. The strains shown are in %. A cylindrical specimen of a brass alloy 10.0 mm (0.39 in.) in diameter and 101.6 mm (4.0 in.) long is pulled in tension with a force of 10,000 N (2250 lbi). If it is known that this alloy has a value for Poisson's ratio of 0.35, compute (a) the specimen elongation, and (b) the reduction in specimen diameter.

 4. For an aluminum alloy, the stress at which plastic deformation begins is 345 MPa (50,000 psi), and the modulus of elasticity Is 103 GPa (15.0 x 10f psi).

 a) What is the maximum load that may be applied to a specimen with a cross-sectional area of 130 mm (0.2 in.) without plastic deformation?

Answer 1