Application of Digital Speckle Whole Field Strain Measurement Analysis System in Measurement and Analysis of Mechanical Properties of Materials
The mechanical properties of a material refer to the mechanical characteristics of the material when subjected to various external loads (tension, compression, bending, torsion, impact, alternating stress, etc.) in different environments (temperature, medium, humidity). The common tests on mechanical properties of materials include tensile tests of materials, compression tests of materials, bending tests of materials, torsion tests of materials, and impact tests of materials, all of which are intended to measure various mechanical properties of materials.
For flexible materials, there are two stages of elasticity and plasticity. The mechanical properties of the elastic stage include the ratio limit, the stress limit that maintains a proportional relationship between stress and strain. Elastic limit, the stress limit of the elastic phase. Elastic modulus, the constant of proportionality between the normal stress and the linear strain in the elastic phase. Shear modulus of elasticity, the constant of proportionality between shear stress and shear strain in the elastic phase. Poisson's ratio, ratio of line strain perpendicular to the direction of loading and line strain in the direction of loading.
The mechanical properties of the plastic stage are: yield strength, stress value at which the material yields. Conditional yield strength. Some materials that do not have a significant yielding stage specify the value of the stress at which a certain amount of plastic strain (for example, 0.2%) is produced as the conditional yield strength. After the stress exceeds the yield strength and then unloaded, the elastic deformation will disappear completely, but the remaining part of the deformation that cannot be eliminated is called permanent deformation or plastic deformation. Strength and strength limit, the stress exceeds the yield strength, the material due to plastic deformation and strain hardening, that increase the strain to continue to increase the stress. This phase is called the strain strengthening phase. The stress limit in the strengthening phase is the strength limit.
The digital speckle whole field strain measurement and analysis system is based on digital image correlation technology and binocular stereo vision technology. In the material test process, speckle images are prepared on the surface of the material test specimen before the experiment, and the surface of the material is collected in real time by the CCD camera mounted on the surface. The material is subjected to deformation images under various applied loading conditions. Through the internal algorithm of the system, the three-dimensional coordinate data of the surface point of the material during the test process is calculated, and the amount of displacement and displacement of the surface during the test of the material are obtained.
System Measurement Principle
Features:
The system has a wide range of applications: It can be used in scientific research and engineering measurement in many disciplines such as machinery, materials, mechanics, architecture, and civil engineering. It is applicable to most materials and provides real-time three-dimensional coordinates, displacement, and strain data of the measured object.
Strong system compatibility: It is also compatible with single-camera two-dimensional measurement and multi-camera three-dimensional measurement; it is compatible with 32-bit and 64-bit systems.
Auxiliary function: It has the function of dynamic deformation measurement of circular marking points; it has the function of trajectory attitude measurement of rigid body.
Extensive interface expansion: with test machine interface, real-time acquisition of test machine force, displacement and other signals; with cupping test machine interface, can measure the FLC curve of the material; with a stereo microscope interface, can achieve a three-dimensional full-field deformation strain of small objects Detection; support simultaneous measurement of multiple camera groups, can simultaneously measure deformation strain in multiple regions; the system has multiple A/D inputs, multiple D/A outputs, multiple switch inputs and outputs, and can be flexibly expanded.
Advanced technology of the system: The 3D deformation measurement system of digital image correlation method independently developed in China; the core algorithm of independent intellectual property rights, and the technical indicators have reached the advanced level in foreign countries.
System technical parameters:
System XTDIC-SD XTDIC-HR XTDIC-HS
Camera parameters 2 million pixels 4 million pixels 2 million pixels
Measuring range mm2 ~ m2 mm2 ~ m2 mm2 ~ m2
Video capture frame rate 20 frames/s 25 frames/s 340 frames/s
Strain measurement range 0.01%~>1000% 0.01%~>1000% 0.01%~>1000%
Strain measurement accuracy 0.01% 0.05% 0.005%
Lighting source Integrated Integrated External operating system XP, Win7/8/10 XP, Win7/8/10 XP, Win7/8/10
Working temperature 5-40°C 5-40°C 5-40°C
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