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dynamic punch Test

Material model selection and calibration for Finite Element (FE) simulations typically utilize uniaxial test data. Veryst recommends validating the material model to ensure that the model accurately captures multiaxial load cases. Typical validations tests such as ball indentation or small punch tests are performed at quasi-static rates even when the application is an impact event.  

Veryst has developed a high strain rate punch test to validate material models in biaxial loading. A hemispherical indenter impacts a disk at velocities from 100 mm/s to 5000 mm/s, typically deforming the specimen to failure. Displacement of the impact head is measured using a high speed video camera and Digital Image Correlation (DIC), while force is measured throughout the experiment. We perform a Finite Element simulation with the candidate material model and compare the force-displacement results of the simulation to the experiment.  

Results from the experiment (left) and the simulation (right) showing the final plastic deformation of the sample.

Video showing the FE results from an experiment. In the video, a cross-section of the sample and indenter is shown for clarity.
The contours show the von Mises stress in the sample during and after the experiment.  

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