When a hot ceramic pot is suddenly submerged in very cold water, which part, sur

Question

When a hot ceramic pot is suddenly submerged in very cold water, which part, surface or interior, will be under tensile stress? why? (2pts) 4. NE column is subject to compressive load. What will be the two possible failure modes for the column? (2pts) 6. Very briefly explain what are principal plane, principal direction and principal stress. (2pts) When a chalk is under pure torsion, which criterion you are going to use to predict its failure? How will the breaking/fracturing surface look like? (2pts) 7. What are the two yield criteria we discussed in the class? If you break an aluminum rod by torsion, how the final breaking surface looks like? (3pts) 8.

Explanation / Answer

4. When a ceramic pot is immersed in cold water, the outer surface absorbs the heat instantly whereas the internal surface cools down as a function of time. Because, the outer surface is exposed to very low temperature. But, the heat must flow to the internal surface through conduction only. So, the outer surface is compressed quickly resulting in tensile stresses on the outer surface. Because, the heat flow to the outer surface is through convection. The heat transfer rate through the convection is greater than the heat transfer rate through the conduction. So, the outer surface of the pot would be under tensile stress.

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