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... is used to determine material properties for component testing and validation/improvement of FEM models.
Following applications can be distinguished:
- Material testing: At a defined loading (tension, compression, torsion, bending), the force and object deformation is measured. From these values, stress strain curves and material parameters like E-modulus, Poisson's ratio or more complex values are determined. Depending on the complexity of the test, different measurement techniques are used:
- RTSS-Videoextensometer. Examples
Determination of E-Modulus
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Long-term test of a rubber specimen
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- Digital Image Correlation. Examples:
Tensile test with large strain
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Shear test
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Crack propagation
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- Component testing is conducted to prove, that a certain loading condition does not lead to failure of the specimen. Besides fatigue tests, very often complex loadings are applied. The measured strain distribution allows the determination of local "hot spots" Due to its high flexibility, Digital image correlation is the best solution for this measurement task.
Examples:
Strain distribution on a clutch spring
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Strain distribution during the welding process
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- Test / Validation of FEM-models:
Digital Image correlation can be used for any object's geometry and material. Example:
| Airbag development |
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Further applications are listed in the section Applications/Digital Image Correlation. |