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Digital Image Correlation (DIC) is a 3D, full-field, non-contact optical technique to measure contour, deformation, vibration and strain on almost any material. The technique can be used for many tests including tensile, torsion, bending and combined loading for both static and dynamics applications. The method can be applied from very small (micro) to large testing areas – and the results are readily comparable with FEA results or strain gauges.

Fields of Application

1)Materials testing(Yang's modulus, Poisson's ratio, elastic-plastic performance parameters)

2)Components and parts testing(displacement measurement, strain measurement)

3)Biomechanics (bones, muscles, blood vessels, etc.)

4)Analysis of morphology and strain(micron-scale, nanometer-scale)

5)Fracture Mechanics

6)Verification of Finite Element Analysis (FEA)

7)High-speed deformation measurement(dynamic measurement, instantaneous measurement)

8)Dynamic strain measurement, such as fatigue test

9)Real-time measurement of the FLC-curve

Technical Features

1)Non-contact dynamic measurement. Obtaining the full-field three-dimensional coordinates, displacement, and strain data.

2)Multi-mode 3D display of the measurement results

3)Suitable for any material

4)Fast, simple and high-precision calibration

5)Measurement format: from 4mm to 4m

6)Range of strain measurement: from the minimum of 0.01% to the maximum greater than 1000%

7)Flexible and easy trigger function; free adjustment of acquisition frequency

8)Multithreaded computing; higher computing speed

9)32-bit or 64-bit operating system

Principles of Measurement

Based on Digital Image Correlation(DIC), binocular stereo vision technology and industrial close range photogrammetry, XTDIC offers a potable, high-speed, high-precision and simple operation solution for three dimensional coordinates, displacement and strain measurement during deformation by tracking the speckle patterns on the tested object surface.

 

Easy to Operate

Based on photogrammetric cameral calibration, XTDIC offers a fast, high-precision and easy calibration solution for different measurement ranges of the formats. Equipped with a crane, it is easy to operate. Various types of light sources provide good illumination conditions for different environment measurement. Multi-function control boxes provide a variety of A/D acquisition, D/A output and trigger function, meeting coordinated operation of peripherals and loading devices.

Software Functions

1)Support two or three dimensional deformation measurement simultaneously

2)Flexible camera calibration, supporting external image calibration

3)Providing flexible and convenient parameter-setting for image acquisition, satisfying the needs of image acquisition in different conditions

4)Flexibly select the object range of interest, improving processing efficiency

5)Flexibly set the size and step length of speckle to meet user requirements of different accuracy and resolution

6)High speed strain computing，providing eighteen different types of results of deformation and strain

7)3D display of calculating results, flexible 3D display

8)Multiple post-processing functionalities, including filling holes by interpolation, data smoothing, etc.

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10)Various analysis of section line, single point and point pair

11)Curve plotting

12)Report form of measuring and analysis results

13)Synthetic videos of measurement results, pictures and curves

Application Cases

Material Performance Tests

 

 

FIG. Application Cases of Material Performance Tests

Performance experiment of materials: rapid measurement of the whole strain, deformation, etc. on the specimen surface, and this can be used to analyze the tensile mechanical properties of materials.

Test site of steel specimen tensile

Measurement result of the steel specimen

Twin probe tensile test of the polymer materials

Measurement result of polymer tensile test

Test site of wood three-point bending

Measurement result of wood three-point bending measurements

 

 

Dynamic Strain Measurement

 

 

FIG. Dynamic Strain Measurement

Fatigue Test: Frequency: 0.2HZ; camera capture speed: 2HZ; Test material: titanium, 10cm diameter

Experimental site

Measurement result

Strain point

Vibration Measurement Experiment: Using two Photron high-speed camera for image acquisition, with the sampling frequency being 2000Hz

High-speed tensile test

Strain curve

Comparison with the results of the strain gauge

Deformation Measurement of Components and Parts

 

 

FIG. Deformation Measurement of Components and Parts

Axle load deformation experiment: controlling the system by using four-channel test machine, loading the axle parts with 28 levels.

Deformation measurement of the truck bridge

Displacement field

Average principal strain of the measured region

Deformation measurement of the airplane wing in flight: Measuring range: tens of meters; maximum deformation of wingtip: 2 meters.

Aircraft wing measuring site

Camera Setting

Wing deformation displacement field

High-temperature Deformation Measurement

 

FIG. Application Cases of High-temperature deformation measurement

 

 

High-temperature Deformation Measurement

 

Verification of Finite Element Analysis (FEA)

 

FIG. Verification of Finite Element Analysis (FEA)

FLC Measurement

Forming Limit Curve (FLC) is used to determine the degree of material deformation when in the state of stretching, bulging, or combination of stretching and bulging. Combined with punch test machine, XTDIC offers real-time dynamic measurement of forming limit curve for sheet metal.

 

 

CONFIGURATION AND TECHNICAL DATA

MODEL	XTDIC-SD(STANDARD)	XTDIC-HR-Ⅰ(HIGH RESOLUTION)	XTDIC-HR-Ⅱ(HIGH RESOLUTION)
CAMERA RESOLUTION(PIXEL)	200 mega	410 mega	600 mega
FRAME RATE	20fps	25fps	13fps
STRAIN ACCURACY	0.005%	0.005%	0.005%
STRAIN RANGE	0.01%-1000%	0.01%-1000%	0.01%-1000%

 

MODEL	XTDIC-HS-Ⅰ(HIGH SPEED)	XTDIC- HS-Ⅱ(HIGH SPEED)	XTDIC- HS-Ⅲ(HIGH SPEED)
CAMERA RESOLUTION(PIXEL)	410 mega	230 mega	200 mega
FRAME RATE	90fps	160fps	340fps
STRAIN ACCURACY	0.005%	0.005%	0.005%
STRAIN RANGE	0.01%-1000%	0.01%-1000%	0.01%-1000%