A single crystal of an FCC metal has a tensile stress applied parallel to [001]. The critical resolved shear stress is 0.5 MPa. What are the applied stresses necessary to cause slip in the (111) plane along [-101], [10-1], and [0-11] directions

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.

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false