NIST (National Institute of Standards and Technology) using Vic-3D for digital image correlation (DIC)

NIST is using the Vic-3D digi­tal image cor­re­la­ti­on (DIC) sys­tem to ana­ly­ze stress in brid­ges. By using DIC, they try to under­stand the impact of stres­ses and strains on the metal con­nec­tors of brid­ges in order to avoid dama­ge or failure.


NIST is pre-strai­ning a wide pla­te with digi­tal image cor­re­la­ti­on (DIC) to deter­mi­ne the small-sca­le spe­ci­men sec­tio­n­ing plan:

https://www.nist.gov/video/pre-straining-pipeline-steel-plate


NIST is con­duc­ting a CWP test with digi­tal image cor­re­la­ti­on (DIC) to deter­mi­ne local and remo­te strains used to deter­mi­ne the Ten­si­le Strain Capa­ci­ty of a fla­wed pipe girth-weld:

https://www.nist.gov/video/curved-wide-plate-testing


NIST is making an SE(T) test with digi­tal image cor­re­la­ti­on (DIC) showing the asym­metric strain gra­di­ent of a spe­ci­men not­ched in the heat-affec­ted zone:

https://www.nist.gov/video/single-edge-notch-tension-testing

The Vic-2D System

Vic-2D can mea­su­re in-pla­ne dis­pla­ce­ments and strains on pla­nar spe­ci­mens. The set­up is simp­le, for sam­ple pre­pa­ra­ti­on only the app­li­ca­ti­on of a ran­dom speck­ly pat­tern is nes­se­sa­ry. No spe­cial illu­mi­na­ti­on or lasers are required.

 

 

 

 

We offer com­ple­te mea­su­re­ment sys­tems for a wide ran­ge of full-field in-pla­ne defor­ma­ti­on mea­su­re­ment tasks.

  • White-light sys­tem
  • No cali­bra­ti­on required
  • real-time data pro­ces­sing (> 50Hz)
  • Sam­ple size <1mm and >10m possible
  • Simp­le spe­ci­men pre­pa­ra­ti­on using paint
  • Syn­chro­ni­zed load data acquisition
  • Avail­ab­le ana­log out­put for machi­ne control
  • Very high strain and dis­pla­ce­ment limits

 

We also pro­vi­de com­pon­ents as well as cus­tom mea­su­re­ment sys­tems for deman­ding app­li­ca­ti­ons inclu­ding high tem­pe­ra­tu­re, hig­her speeds, and very small- or lar­ge-sca­le samples.

 

Application

The Vic-2D sys­tem is used whe­re strain dis­tri­bu­ti­ons need to be mea­su­red on flat spe­ci­mens. App­li­ca­ti­ons inclu­de frac­tu­re mecha­nics (COD mea­su­re­ment), bi-axi­al ten­si­on tests of films, deter­mi­na­ti­on of strain loca­liz­a­ti­on around cracks or not­ches as well as many app­li­ca­ti­ons in FE model verification.

 

 

Application example

Strain Mea­su­re­ment — 2D Fati­gue Test