Question

Why are we not understanding equation for equilibrium in stress?

Answer 1

A physical equilibrium is a system whose physical state does not change when dynamic equilibrium is reached while in a chemical equilibrium chemical composition of the system does not change when dynamic equilibrium is reached.. Example of physical equilibrium: When a solid is heated it starts melting at a certain fixed temperature (melting point). At this stage even when the heating is continued, the temperature does not change until the whole of solid is converted into liquid.

Answer 2

Answer:

The correct stress distribution for a problem in solid mechanics must satisfy these equations of equilibrium. Example 5-2-1 Consider an axially loaded, uniform rod. The axial stress is given by s x = P/A ; all other stresses are zero, and you see by substitution into the above equations that equilibrium is satisfied.