3D Digital Image Correlation
 

3D Digital Image Correlation

Mercury RT is a software technology that uses Digital Image Correlation (DIC) technique to perform 3D full-field with a non-contact optical technique to measure contour, deformation, vibration and strain on almost any material. It provides on-line data acquisition as well as data processing. Mercury’s 3D module is specifically designed to handle complex analyses, making it ideal for applications requiring precise spatial measurements of material deformation and strain.

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Key Features

Integrated Camera Control

Mercury RT supports the control of various high-speed cameras from Phantom. You can control the camera from Mercury’s software and do everything from shooting to analysis on the same software.

Real-Time Measurement

Mercury’s real-time measurement function is a powerful tool for capturing and analyzing the dynamic behavior of objects and materials in real time. This function instantly measures the movement and deformation of objects, and processes and displays the data in real time.

Pattern Evaluation

In DIC analysis, the quality of the pattern (usually the speccle pattern) applied to the surface of the measured object directly affects measurement accuracy. The pattern evaluation function is used to evaluate the quality of this pattern before measurement to confirm the appropriate pattern is applied.

 

Probe Functions

Mercury utilizes virtual probes to measure the deformation and movement of samples with high accuracy. These probes allow users to track specific points, lines, or areas of interest, capturing detailed data on displacements, deformations, and other critical parameters

 

Point Probe Measure the position and displacement of the selected point
Line Probe Measure the distance between two points of the sample
Chain Probe Divide the Line into multiple segments and calculate the segment data with the highest growth.
Force Gauge Calculate the stress and true stress from the specified rigid body of the Force Gauge over time.
Polyline Probe Measure the total length of a non-linear object after deformation and calculate the maximum deflection of the bent cantilever
Point Group Probe Calculate a value over a group of points, such as the change in rotation of a measured specimen.

Extensions

Mercury RT has the ability to come equipped with both formsys and vibrography extensions to suit specific material testing needs

FormSYS

  • Forming Limit Curve (FLC) Analysis:
    • Evaluates the limits of material deformation during the forming process.
    • Derived from the Forming Limit Diagram (FLD), where results from Nakajima or Marciniak tests are plotted.
  • Geometry-Specific Testing:
    • Requires measurement of a series of samples with different geometries to accurately construct the FLC.
    • Determines whether a drawn component is well-designed or requires optimization based on the curve.

Vibrography

  • Frequency Domain Analysis:
    • Allows detailed analysis of data in the frequency domain.
    • Ideal for examining natural frequencies and operational deflection shapes of tested parts or structures.
  • High-Speed Camera and Video-Stroboscopic Integration:
    • Expands the use of high-speed cameras and video-stroboscopic effects for precise vibro-diagnostic measurements.
    • Enables the visualization and analysis of dynamic behaviors that are otherwise difficult to capture.

Computed Output Values

Measurements
Output Values
Length and Extension
Length [mm], Length Extension [mm] or in [%], Length Change in X [mm], Length Change in Y [mm], Length in X [mm], Length in Y [mm], Length in Z [mm]
Width measurement
Width [mm], Width in X [mm], Width in Y [mm], Width Extension [mm] or in [%]
Tensile Testing
Poisson Ratio [-], Poisson Ratio XY [-], Poisson Ratio YX [-], Plastic Strain Ratio [-], Stress [MPa], True Strain [%], True Stress [MPa]
Angle measurement
Angle to X axis [°] or in [rad], Angle Change [°] or in [rad], Curvature [°] or in [rad], Curvature Change [°] or in [rad]
Position and Displacement
Displacement [mm], Displacement in X [mm], Displacement in Y [mm], Displacement in Z [mm], Position in X [mm], Position in Y [mm], Position in Z [mm],
Twist
Torsion angle [°] or in [rad], Torsion angle – start point [°] or in [rad], Torsion angle – end point [°] or in [rad]
Strains and deformations
Strain E1 [-], Strain E2 [-], Strain EXX [-], Strain EYY [-], Strain EXY [-], Shear Strain [%]
Strain rate
Strain E1 Rate [-/s], Strain E2 Rate[-/s]
Stress computation
Stress 1 (elastic) [MPa], Stress 2 (elastic) [MPa], Stress X [MPa], Stress Y [MPa], Stress XY [MPa], Tresca Stress [MPa], Von Mises Stress [MPa]

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