DIC strain measurement of inflating mylar balloons.
Select a test from the dropdown above or click a row below.
PressureβPSI
Areal Strainβ%
Ξ΅β Majorβ%
Ξ΅β Minorβ%
Diameterβin
Hoop StressβMPa
Elapsedβ
DIC Subsetsβ
+5%0%-5%
0 / 0β PSIΞ΅: β0:00
3D Profile Slices
?Cross-section slices through the balloon's 3D point cloud. Left panel β Circumference (X vs Z): equator slice showing how the balloon bulges toward the camera across its width. Right panel β Vertical (Z vs Y): center slice from top to bottom.
Ghost lines show past frames (blueβred = earlyβlate). Use Trail controls to adjust persistence.
Strain History
?Areal strain over time for all DIC subsets. Blue line = median, shaded band = P10βP90 range (10th to 90th percentile). Click a dot on the heat map to overlay that point's individual strain history.
Global median Β· click a subset to overlay
Circumference & Pressure vs Time
?Balloon circumference (inches, from inflator sensor) and internal pressure (PSI) over time. Syncs with the video timeline above.
StressβStrain (DIC)
?Hoop stress vs strain. Stress = PΓr/(2t) where P = pressure, r = radius, t = wall thickness. Shows how the balloon material responds to loading. The dashed yellow curve is a saturating exponential fit Ο = AΒ·(1βe^(βBΒ·Ξ΅)) β stress rises steeply then plateaus toward A.
Biaxiality (Ξ΅β vs Ξ΅β)
?Major vs minor principal strain. Points on the diagonal mean equibiaxial stretching (uniform in all directions). Points off-diagonal mean the balloon is stretching more in one direction. Color = pressure.
Stress vs Time
?Hoop membrane stress (Ο = PΓr/2t) from the inflator sensor data over time. If wall thickness is unknown, shows membrane tension (N/m) instead of stress (MPa).
Strain vs Time
?Engineering strain from the inflator's diameter sensor: (d β dβ) / dβ Γ 100%. This is an independent measurement from the diameter tape, not from DIC.
Balloon Specs
Test Results
Plateau Summary
?Pressure plateaus are constant-pressure holding periods detected automatically from the pressure timeseries. For each plateau: mean pressure, diameter, and creep rate β the slow continuing deformation under constant load (measured as strain change per second).