Question

Discuss three categories of evident failures

Answer 1

Most common failures in Material is given below:

1) Fracture: When cracks appear : Some parts fracture slowly and deform plastically before seeing a sign of a crack… that’s because those parts are built in a ductile material.

2) Insufficient Stiffness (Deflection): When flexibility causes failure: Whatever the mechanical system you build, it must be stiff enough to resist the loads.

3) Buckling: When a loss of stability creates big damage :

Buckling a kind of failure that happens to certain types of slender geometries because of the inner instabilities that occur in the loading.

In it very dangerous because buckling failure can happen much before the material failure (Yielding).

4) Fatigue: When time causes a loss of strength : When you use a system, even if it is designed to be resistant enough to the loads applied to it… after some cycles of loading, the parts start to lose strength and become weaker ,and finally failure occure in material.

5) Creep: When a body deforms over time : Creep is simply the natural tendency of some solid materials to move slowly or deform permanently under stress. It is increased when the materials are heated (the extreme example is when steel is melt under high heat to make it change shape)

I hope question is asked about failures in term of material failures.