2D Digital Image Correlation

2D Digital Image Correlation: Simply See More

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.

Key advantages and features

Why use 2D Digital Image Correlation (DIC)?

Through 2D DIC, in combination with standard strain measurement, you gain valuable additional information on specimen behavior for specimens that maintain a plane surface throughout the test.

The ZwickRoell 2D DIC option 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.
You can also analyze complex specimens with notches or non-homogeneous materials.
Errors in the test arrangement, such as inaccurate specimen alignment quickly become visible.

Convenient evaluation with testXpert III

The 2D DIC option was developed in-house at ZwickRoell and is fully integrated in testXpert III. With just one software system, live measurement and 2D DIC-analysis are performed and all measured values are managed.

Measured values, test results and images are stored, managed and evaluated together. You can easily and extensively analyze all measured values with each other. Strain values of a gauge length defined in the 2D DIC can be displayed and evaluated in a stress-strain curve.
You will reach your goal quickly and with just a few clicks: by specifying a workflow, you are guided step by step from setup to analysis and display of the measured values.
Prepare analysis parameters once, then save them in testXpert and use them over and over.
Reliable results: the 2D DIC-measured values are synchronized with the measured values of the testing machine.
Through the test re-run option for each evaluation a new specimen is added whenever you choose. This makes evaluation retrievable.

Easy specimen preparation

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.

DIC setup: go with the (work) flow

Operating the 2D DIC is simple and intuitive. By specifying a workflow, you are guided step by step from setup to analysis and display of the measured values.

Technical overview

Description	Value
Type	2D Digital Image Correlation
Item No.	1018509
Frame frequency	Up to 50	Hz
Resolution specifications for virtual strain gauges with an edge length of 5x5 mm are dependent on the videoXtens system version:
videoXtens 1-120	90	µStrain¹
videoXtens 1-270	150	µStrain
videoXtens 3-300	90	µStrain
videoXtens 2-120 HP	25	µStrain
videoXtens biax 2-150 HP	20	µStrain
Minimum version	testXpert III V1.61

The accuracy and resolution of the virtual gauge length corresponds with the videoXtens system used, i.e. videoXtens biax 2-150 HP: 0.15 µm and accuracy class 0.5 (ISO 9513)

Explanation of the resolution specification: 100 µStrain correspond to 0.01% extension. Based on a gauge length of 5 mm, 100 µStrain correspond to a resolution of 0.5 µm.

2D Digital Image Correlation (DIC):Simply Analyze

Analysis tools

Analysis tools in 2D DIC

Measuring points: these can be placed in any desired locations within a strain map.
Gauge lengths or virtual extensometers: establish two points on the strain map, between which the change in distance is to be determined.
Intersections: the strain progression is visualized along the lines. The intersection deforms with the specimen. In addition, there is an intersection stack through which selected time steps are displayed in a diagram, making the time-based development of the intersection visible.
Virtual strain gauges: for the virtual strain gauges, you can individually define the position, size and angle. In addition, multiple virtual strain gauges can be placed on top of each other at different angles. For example, two virtual strain gauges can be combined to form a biaxial strain gauge with measuring grids oriented at 90° to each other. The virtual strain gauges can save you a lot of time and cost.

Creation of graphs / diagrams

Graphical display / diagram

The following measured values can be displayed as strain maps and in diagrams:

Displacements in X direction
Displacements in Y direction
Local longitudinal strains Ɛ_x
Local transverse strains Ɛ_y
Local shear strains Ɛ_xy
Maximum normal strains
Minimum normal strains
Poisson's ratio
Equivalent Von Mises strains

Vector maps can be displayed in all strain maps, showing the main strain directions.

Export options

Export options:

Export of individual data in .csv
Export of the video in .avi
Export color map / diagram in .bmp

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Downloads

Product Information:2D Digital Image Correlation (DIC) PDF 1 MB
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