🎈 Balloon Catalog

🎈 Balloon Materials Testing

Select a balloon test from the dropdown above to view interactive strain analysis, pressure-diameter curves, and 3D surface visualization.

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Frame — Stereo camera frame index (~2 fps). Use slider or ← → arrow keys to step through the inflation sequence.

Pressure — PSI Internal gauge pressure (PSI) interpolated from plateau data. 1 PSI = 6,895 Pa. Measured by differential pressure transducer.

Diameter — in Mean balloon cross-section diameter from stereo vision (inches). 1 in = 25.4 mm. Computed as average of width measurements across the visible profile.

Stress (σ) — MPa Membrane stress via Laplace thin-sphere law:
σ = P·R / (2t)
P = gauge pressure, R = balloon radius (D/2), t = wall thickness. Valid when t ≪ R. Units: MPa.

Plateau — Current pressure plateau ID. A plateau is a ~30 s stable-pressure window (ΔP < 0.5%) used for creep and strain rate measurements. '—' = between plateaus.

Strain (med) — Median Green-Lagrange strain across all tracked surface dots, relative to the Ref Frame.
ε = (l² − l₀²) / (2l₀²)
Positive = tension (stretching), Negative = compression. P10/P90 tell spread.

Ref Frame Strain reference frame — ε is re-zeroed to 0 at this frame. Default = 0 (first frame). Click 📌 to pin the current frame as the new zero-strain reference.

3D Strain Viewer

2D Wireframe Markers Photo

Pressure & Diameter vs Time

Diameter vs Pressure + Creep

Stress Analysis

Strain Statistics

Blob Detail Plot

Click a blob in the table or 3D viewer to see its strain history

Inflator Pressure (5 Hz)

Pressure & Diameter vs Time

Balloon Specs

Test Results

Test Conditions

Methods

Conclusions

Diameter vs Pressure

Creep Rate vs Pressure

Plateau Summary

Membrane Stress vs Pressure (Laplace: σ = PR/2t)

Stress–Strain Curve

Equibiaxial membrane stress vs engineering strain from diameter. Thickness required in manifest.

Wall thickness: µm

Strain Distribution Over Time

Strain Rate vs Pressure

Inflator Summary

Pressure vs Time (Raw 5 Hz)

Diameter & Height vs Time

Environment (Temperature & Humidity)

Station Pressure with Pump State (hPa)

Blob Inspector

Per-marker stats computed from tracking data. Click a row to select in 3D viewer. Toggle 👁 to mute bad blobs from strain colormap. Hidden blobs are excluded from the p05/p95 color range so one outlier doesn't flatten everything.

Blob Shape Strain (Ellipse DIC)

Per-blob principal strains from ellipse fitting. Each hand-drawn circle deforms into an ellipse as the balloon inflates — the semi-axis ratios give e1/e2 principal strains and areal strain without mesh interpolation.