Question

For a rectangular bar of a new type of metal alloy with initial dimensions of 8 mm wide and 45 mm long, what will be the ratio of the change in width to the change in length upon application of a tensile stress of 275 MPa if the Young’s modulus has been found to be 267 GPa and Poisson’s ratio is 0.28? Circle your answer

Answer #1

(a) Determine the critical crack length for a center crack in a
plate of aluminum alloy under uniaxial tension. The critical stress
intensity factor of this alloy is 25.5 M P a ⋅ m. The plate width
and thickness are 250 mm and 10 mm, respectively. Along the length
direction, a 1000 kN force is applied. Assume Y = π. The Young’s
modulus is 85 GPa. The yield strength is 105 MPa. (b) What is the
critical crack-tip opening displacement...

Problem. A cylindrical specimen of a hypothetical metal having a
diameter of 7.671 mm and a gauge length of 251.905 mm is pulled in
tension. Use the load–elongation characteristics shown in the
following table to complete parts (a) through (f).
(a) Plot the data as stress (MPa) versus strain
(b) Compute the modulus of elasticity in GPa
(c) Determine the yield strength at a strain offset of 0.002
(d) Determine the tensile strength of this alloy
(e) What is the...

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