A aluminum plate 0.5 cm thick is to withstand a force of 50,000 N with no permanent deformation. If the aluminum has a yield strength of 125 Mpa, what is the minimum width of the plate?

A prismatic aluminum bar has cross-sectional dimensions 40 x 60 mm and a length of 350 mm. The modulus of elasticity is 70 GPa and Poisson's ratio is u=0.35. When an axial load of 100 kN is applied, the proportional change in the bar's volume is

A copper rod with a diameter of 24 mm is subjected to tension within the elastic region. If themodulus of elasticity is 115 GPa and a Poisson’s ratio of 0.34. Determine the force that willproduce a reduction of 0.003 mm in the diameter.

The maximum measured Young’s modulus for a carbon nanotube is 950 GPa.  How much stress would have to be applied to this nanotube to have the same strain as in the steel sample?

1. The tensile strength vs. temperature curves of aluminum are plotted below. Explain the meaning of these two curves. 400 Ultimate strength 300 Yield strength 200 100 -200 -150 -100 -50 50 100 150 200 250 Temperature, °C Strength, kPa

What is the effect of crosslinks on an elastomer and what is the structural explanation for their effect? What would happen to the amount of stretch, hardness, strength, and creep in an elastomer if the crosslink density were increased?

A tensile stress is to be applied along the long axis of a cylindrical nickel rod that has a diameter of 11 mm. Determine the magnitude of the load required to produce 2.5 × 10−3mm change in diameter if the deformation is entirely elastic.

Given your understanding of what initiates and controls failure in materials, which of the following will increase the failure strength or lifetime of a test piece or component and why? a. Decreasing the difference between the maximum and minimum stress values, as this effects the stress concentration factor b. Decreasing the temperature below the brittle-ductile transition temperature, to make it harder C. Polishing to reduce surface defects Od. Increasing its volume, to give a larger cross sectional area Oe. Increasing the grain size so there are less grain boundaries to initiate failure

If it is constrained between two supports A and B and is stress-free at 20 ℃, what would be the stress in the two materials when it is heated to 70 ℃, For Steel: Es = 210 GPa, Coefficient of expansion = 12x10^6/℃. For Brass: Eb = 105 GPa, Coefficient of expansion = 19x10^-6/℃

An aluminum tensile test specimen has a diameter, do = 25 mm and a gauge length of Lo = 250 mm. If a force of 175 kN elongates the gauge length by 1.25 mm, the modulus of elasticity of the material is nearly