2D Digital Image Correlation
 

2D Digital Image Correlation

Mercury RT is a software technology that uses Digital Image Correlation (DIC) technique to perform 2D 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 2D module is specifically used to measure the dimensions and deformations of planar objects. This includes basic measurements such as length, width, and area.

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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.
Neck Gauge In addition to detecting necks that occur during tensile tests, it calculates the Poisson ratio and plastic strain ratio
Polyline Probe Measure the total length of a non-linear object after deformation and calculate the maximum deflection of the bent cantilever
Shear Probe Calculate the angle between the two intersecting lines and the shear strain.
Rigid Plane Probe Calculate the movement of the coordinate system over time.
Angle Probe Calculate the angle between the two lines with the starting point of the share and the related values
Strain Gauge Uses a virtual gauge to evaluate the strain (or deformation) tensor and Poisson ratio

Extensions

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

Thermography

  • Thermo-Mechanical Integration:
    • Combines thermal and mechanical analysis to evaluate material behavior with high strain and temperature resolution.
    • Allows for the detailed study of deformation effects on thermal behavior and vice versa, providing a holistic view of material performance.
  • Simultaneous Deformation and Temperature Field Evaluation:
    • The technique enables the simultaneous measurement of deformation and temperature fields within the region of interest.
    • High accuracy and response speed from both thermal and mechanical cameras ensure precise and reliable data collection.

Crack

  • Versatile Application:
    • Applicable to different materials, including composites (e.g., Double Cantilever Beam), steel (e.g., Compact Tension specimen), and concrete.
    • Allows detailed monitoring of crack progression, crucial for assessing material integrity and performance.
  • Mono Mode Operation:
    • Crack measurements are performed in mono mode without stitching, focusing on detecting the end (tip) of a crack as it grows.

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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