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Mechanical Properties of Solids

What is elastic fatigue and why bridges are declared unsafe after long use?

When continuous restoring and deforming force is applied, a body loses its strength and body is said to undergo elastic fatigueness. Bridges are regularly and continuously used. Hence, they are under alternate stress which causes elastic fatiguenes in steel. Therefore, bridges are declared unsafe for prologed use.

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Plot the graph between intermolecular forces. What is the range of these forces? What is the range of these forces?

If we compress or elongate the solids, what happens to potential energy of solid?

A rectangular beam is bent into arc of a circle. What type of strain is produced in it?

A piece of rubber under an ordinary stress can display 100% strain; yet when unloaded, it returns to its original length. Does this show that the restoring forces in a rubber piece are strictly conservative?

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