Suppose the fracture toughness of a titanium alloy has been determined to be 44 mpa. m2, and a penny-shaped crack of diameter 1.6 cm is present in a plate used in uniaxial tension. calculate the maximum allowable stress that can be imposed without fracture. the yield stress of the material is 900 mpa, and the plate thickness is 5 cm.

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.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false