engleski

Influence of X-CT scanning parameters on DVC measurement uncertainty

X-Ray Computed Tomography (X-CT) and Digital Volume Correlation (DVC) are powerful tools for comprehensive characterization of opaque materials. As opposed to high frequency image sampling with classical cameras, CT scanners require tens of minutes if not hours to record a single high-quality set of radiographs. Moreover, numerous states of the sample need to be acquired to describe the entire loading history of a single in-situ mechanical test monitored via XCT. To surpass these limitations, several strategies can be followed. Projection-based Digital Volume Correlation (P- DVC) overcomes these challenges by extracting the measurands (i.e., displacement and strain fields) directly from few radiographs instead of completely reconstructed volumes. Further, the effect of material relaxation originating from its time-dependent behavior is mitigated since X-CT projections are captured continuously (and fast) during loading. The second route includes conventional DVC analyses on scans acquired with different scanning parameters. For instance, a decrease of imaging time is achieved by recording scans with lower quality. Even though this approach does not exclude spurious motions during acquisition, more detailed temporal evaluations can be conducted, for instance, for damage with respect to the underlying microstructure.

X-Ray Computed Tomography ; Digital Volume Correlation ; measurement uncertainty

nije evidentirano