Auxetic Phone Cases

Negative Poisson’s Ratio • Re-entrant Honeycomb • Drop Test • Strain Shader • OBJ / GLB / STL

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Phone Model

Model iPhone 15

Case Design

Lip Height (mm) 9

Case Clearance (mm) 1.5

Auxetic Pattern

Grid Density (cols) 10

Grid Density (rows) 15

Cell Size (mm) 8

Re-entrant Angle (°) -25

Wall Thickness (mm) 1.2

Case Thickness (mm) 3

Material TPU 95A

Drop Test Physics

Sphere Mass (kg) 5.0

Drop Height (mm) 120

Sphere Radius (mm) 15

Gravity (m/s²) 9.81

Hinge Stiffness 0.8

Auxetic Phone Case — 3D

Verts: — • Tris: — • Cells: —

Strain Visualization

Show Strain Colors

Strain Scale 1.0

Low

High

Exaggerate Deformation

Deform Scale 5

Panel Specs

Phone	—
Case Size	—
Grid	—
Cell Size	—
Re-entrant Angle	—
Poisson’s Ratio (est.)	—
Material	—
Impact Energy	—

Reference

Auxetic: Negative Poisson’s ratio — thickens under tension
Re-entrant: Inverted hex cells create NPR behavior
TPU 95A: Shore 95A, elongation 580%, density 1.21 g/cm³
Physics: Ammo.js btHingeConstraint at each vertex
Strain: Custom ShaderMaterial — blue(0) to red(max)

Export

Ready. Select phone model and click Generate Case.