Los Alamos National LaboratoryGo to the Lab's home pageSearch for people in the Lab's phone book
     
  logo

Contour Method: Principle

 
transparent spacer
 
HOME
> Principle
   - make cut
   - measure surface
   - calculate stress
Validations
Applications
   - bent beam
   - weld plate
   - quenched steel
   - impacted plate
   - alum. forging
   - friction stir weld
   - Ti FSW
   - Railroad rails
Publications
More info
 
Residual Stress
Conferences
Vertical Linetransparent spacer

Measure multiple stress components using one cut, multiple techniques, and superposition

To measure multiple stress components with multiple cuts see:
download preprint Pagliaro, P., Prime, M. B., Swenson, H., and Zuccarello, B., "Measuring Multiple Residual-Stress Components Using the Contour Method and Multiple Cuts," Experimental Mechanics, 50(2), pp. 187-194, 2010. (LA-UR-09-01120)

Basic Contour Method:


 

The Contour Method is Based on an Elastic Superposition Principle:

Initial residuaol stresses
Start with your part. These are the residual stresses that you would like to measure

Experimentally cut the part in two. The part will deform from the release of the stresses

Then experimentally measure the contour, or shape, of the newly created surface


Now analytically force the cut surface back flat. This gives the original residual stresses normal to the cut plane!

It really is simple, but gives you a full 2-D map of the original residual stresses over the cross-section of the part!


Details:

 

 

transparent spacer       transparent spacer
   

Managed by Triad National Security, LLC Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA
contact: Mike Prime at prime@lanl.gov | Copyright & Disclaimer
U.S. patent 6,470,756 | Last Modified: July 28, 2017

spacer spacer spacer spacer