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2D Digital Image Correlation (2D DIC)

Obtain valuable additional information on specimen behavior together with standard strain measurement!
ZwickRoell’s DIC makes local strains visible in 2D over the entire specimen surface.

What is 2D digital image correlation?

2D digital image correlation visualizes deformations and strain over the entire visible specimen surface. The non-contact videoXtens extensometer records image series during the test, compares image by image, and calculates the displacement in a pre-defined facet field, where each facet includes a specified number of camera pixels. This data is used to create two-dimensional color strain maps, which allow you to analyze the specimen behavior at a glance.

Why 2D digital image correlation (DIC)?

ZwickRoell’s DIC makes local strains visible in 2D over the entire specimen surface:

  • Color displays of specimen behavior provide indications of inhomogeneous local strain and other special features.
  • Analyze complex specimens with notches, components, or non-homogeneous materials.
  • Verify your live strain measurement results.
  • Errors in the test arrangement, such as inaccurate specimen alignment quickly become visible.

Specimen preparation for 2D digital image correlation: very simple – or simply omit

A high-contrast pattern can simply and quickly be sprayed onto the specimen.

Additional markings are not necessary for the live strain measurement. Virtual gauge marks are placed on the existing pattern through the software.

 

What is special about the cutting line in 2D DIC?

With the cutting line, strain progression is displayed along or diagonally across the specimen. The cutting line deforms along with the specimen. It is therefore not a fixed part of the image, but rather a line that actually follows the behavior of the specimen throughout the test.

One special function of the cutting line is the cutting line stack: selected time steps can be displayed in a diagram, allowing you to see the development of the cutting line over time.

What makes virtual strain gauges so efficient?

Virtual strain gauges are efficient because they provide a cost-effective alternative to adhesive strain gauges. This eliminates the time required to apply the strain gauges.

The virtual strain gauges are flexible: position, size and angle are individually determined. They can also be placed on top of each other,whereby two virtual strain gauges create a biaxial strain gauge with measuring grids oriented at 90° to each other.

In addition to local strain information at the strain gauge position, 2D DIC also provides a view of the entire specimen.

What is the benefit of vector maps?

Vector maps display the main strain directions. This makes the strain conditions visible over the entire evaluation range and you quickly gain a good overall understanding of what is going on with the specimen.

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