List of top Materials, Manufacturing & Industrial Engineering Questions on Material Science

An isotropic brittle material is tested in the universal testing machine. The stress-strain diagram for the material shows a bi-linear elastic behavior as shown in the figure given below. The strain energy density is _________ MJ m\(^{-3}\) (rounded off to 2 decimal places).


 

The state of stress at a point is shown in the figure given below. Under plane stress assumption, the normal strain along the thickness direction (\(\epsilon_{zz}\)) is _________ (rounded off to 2 decimal places).


 

Wire drawing operation is performed on a perfectly plastic metal without any strain hardening. Assuming no friction and no redundant work, the maximum possible percentage reduction in area in a single pass is closest to:
A liquid metal is poured in a mold cavity of size 200 mm \(\times\) 200 mm \(\times\) 200 mm. The cooling is uniform in all directions with NO additional compensation for shrinkage. Considering the volumetric shrinkage during solidification and solid contraction as 7% and 8%, respectively, the length of the cube edge after cooling down to the room temperature is _________ mm (rounded off to 1 decimal place).
A metallic square plate is subjected to a uniform hydrostatic pressure (\(P\)). Choose the correct Mohr's circle representing the state of stress at any point in the plate from the options given below. For the Mohr's circle, normal stress is positive towards the right and shear stress is positive in the upward direction.
Among the following surface hardening processes, steel is heated to the lowest temperature in:
Two metal parts (a cylinder and a cube) of same volume are cast under identical conditions. The diameter of the cylinder is equal to its height. The ratio of the solidification time of the cube to that of the cylinder is _________ (rounded off to 2 decimal places).
Assume that solidification time follows Chvorinov’s rule with an exponent of 2.
The yield stress of a metal in uniaxial tension is 200 MPa. According to von Mises yield criterion, the yield stress (in MPa) of the metal in pure shear is closest to: