A non rotating aluminum rod has diameter of 1.5 inches. It is loaded in fully reversed torsion at a temperature that can go as high as 300 F. The steel has ultimate tensile strength of 45 kpsi. You may use 99% reliability. a) Determine the uncorrected fatigue strength Sf’b) Determine the corrected fatigue strength Sfc) Develop an equation for the corrected S-N diagram and plot it (logarithmic axes would make it look like the ones in the book) for up to 108 cycles. d) If a certain application of this rod induces fully reversed bending stress of 25 kpsi, what would be the life of the rod (in cycles)?

If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.