Skip to main content
Feb 26, 2016 / Haseeb Jamal -

5 Travel Myths You Need to Stop Believing Right Now

Feb 26, 2016 / Haseeb Jamal -

Canal Comes Alive with Lighted Boat Parade.

Strain Hardening | Definition and Effects

Profile picture for user Haseeb Jamal
By: Haseeb Jamal / On: Jul 20, 2017 / Definition
 
 

Definition:

In the plastic region, the true stress increases continuously i.e when a metal is strained beyond the yield point, more and more stress is required to produce additional plastic deformation and the metal seems to have become more stronger and more difficult to deform. This implies that the metal is becoming stronger as the strain increases. Hence, it is called "Strain Hardening". Strain Hardening Formula The plastic portion of the true stress-strain curve (or flow stress curve) plotted on a log-log scale gives the n value as the slope and the K value as the value of true stress at true strain of one.

log(ø) = log(K)+ n x log(e)

For materials following the power law, the true strain at the Ultimate Tensile Strength is equal to n. when you plot the log-log plot, use data points after the yield point (to avoid elastic points) and before instability (necking).

A material that does not show any strain hardening (n=0) is classed as perfectly plastic. Such a material would show a constant flow stress irrespective of strain. K can be found by substituting n and a data point (from the plastic region) in the power law or from the y-intercept.

Strain hardening reduces ductility and increases brittleness.

 

Subscribe to our Newsletter

Stay informed - subscribe to our newsletter.
The subscriber's email address.

Search AboutCivil

Related Content