In this application video, a 3-cam 5 Mpx FlexDIC system is used to measure the shear strain XY of
a 3D-printed Coupon with Istra4D V4.12.In the live setup acquisition mode, the Camera (Position) Name Overlay is available that allows users
to custom-define the camera name and display its position in the visualization window (particularly
helpful for MulticamDIC setups). Additionally, the Camera Reticles Crosshair Sizing is also available
that allows users to align the various camera views of the test object.In the projection calibration, the QR-code of the 10mm Calibration Target is recognized and detected
automatically via Istra4D. Each calibration target has its own encrypted QR-code which states the
calibration target’s inherit ID and properties. During the online calibration, the projection calibration
model is computed and updated with a live feedback status.Using the ringbuffer recording mode, 998 frames are saved pre-trigger and 2 frames are saved post-trigger
at the current acquisition speed of 50 fps. As such, the pre/post-trigger is acquired after the specimen has
already fractured.In the correlation evaluation, using the Central Reference Camera Perspective (CRCP), the definition of the
reference subset/facet shape can be selected in any of the three cameras. The central or middle camera serves
as the best reference for the reference subset/facet shape definition since it is most perpendicular (no stereo
angle) to the object and as such, the subset/facet shape is least distorted. Using 3-cameras, a curvature angle
section of 140° can be measured. This is not physically possible using a 2-camera setup. Additionally, using the
CRCP concept the measurement accuracy is 30% higher compared to a 2-camera solution.In the graphical visualization, the 2D-overlay of the shear strain XY can be seen as +/-13 mstrain (before fracture).
A temporal plot is also created using a virtual line gauge of the engineering line strain (in mstrain) and absolute
load signal (in N). At 1100 N, the load drops suddenly indicating the sample has fractured.
Compression Test of a 3D-printed Cylindrical Specimen using Istra4D V4.12
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