**Tensile stress**(or tension) is the

**stress**state leading to expansion; that is, the length of a material tends to increase in the

**tensile**direction. The volume of the material stays constant. When equal and opposite forces are applied on a body, then the

**stress**due to this force is called

**tensile stress**.

Considering this, what is the difference between yield stress and ultimate stress?

The material then becomes strain hardened until you reach the

**ultimate strength**and necking starts to occur and the material becomes weaker again until it breaks apart.**Yield stress**is the**stress**at which that the material deforms permanently,**ultimate tensile stress**is the**stress**at which it breaks.What is the ultimate strength of a material?

The ultimate strength is the maximum stress that a material can withstand before it breaks or weakens. For example, the ultimate tensile strength (UTS) of AISI 1018 Steel is

**440 MN**/m^{2}. In general, the SI unit of stress is the pascal, where 1 Pa = 1 N/m^{2}.Why is the ultimate tensile strength important?

The

**tensile strength**of a metal is essentially its ability to withstand**tensile**loads without failure. Ductility, on the other hand, measures a material's ability to deform under**tensile**stresses. This is an**important**factor in metal forming processes since brittle metals are more likely to rupture.