OBSERVATION CHAMBER / ACTIVE

OBSERVATION ROUTE

CURRENT: 85 PHOTOELASTIC STRESS OBSERVATORY

Open the full 1-chamber route

85 FIELD / PHOTOELASTIC STRESS

Photoelastic Stress Observatory

Observe a deterministic 2D photoelastic surrogate: load a sample, rotate the polarizers, and read relative principal-stress difference patterns.

field / photoelastic stress Observation Model

ROUTE 85 / FIELD / PHOTOELASTIC STRESS

01 / OBSERVE THE FRINGES

Read stress difference through polarized light

Change the specimen, loading mode, load point, and polarizer angles. The chamber draws a relative photoelastic pattern from one consistent Jones approximation.

READY

Drag inside the sample to move the load point · ← → ↑ ↓ move it · Q/E alpha · Z/C beta · L lens · R reset

The field is ready.

Sample: PLATE
Load: 50%
Load point: 0.50, 0.50
Cells: 3,648

02 / SET THE FIELD

Specimen and optics

clean

SPECIMEN

PLATE

LOADING

PUSH

Relative load 50%

POLARIZER ANGLES

COMBINED

Polarizer α 0° Analyzer β 90°

The Jones approximation uses the same α, β, principal orientation, and retardation for every pixel.

VIEW LENS

δ / φ

Isochromatic follows retardation δ. Isoclinic marks principal orientation φ. Combined shows both.

KEYBOARD

Focus the Canvas: ← → ↑ ↓ move · Q/E α · Z/C β · 1–3 specimen · P/B mode · L lens · R reset

03 / READ THE MODEL

Relative stress and retardation

FINITE / OK

Loading mode: PUSH
Relative stress difference: 0.000 relative
Mean relative difference: 0.000 relative
Maximum retardation: 0.00 cycles
α / β: 0° / 90°
View lens: COMBINED

Cell hash--------

CanvasCanvas / ready

Canvas pixels0

Render generation0

Pointeridle

LifecycleRAF 0

04 / CHECK THE NUMERICS

Deterministic self-tests

0/0

Self-test is running.

Observation report

No report yet.

OBSERVATION CONTRACT

Fringes show a relative difference

The color pattern encodes a normalized principal-stress difference. It is a static 2D surrogate for teaching. It is not a calibrated photoelastic experiment or an absolute stress meter.

WHAT TO WATCH

Separate δ from φ

ISOCHROMATIC follows retardation δ from the principal-stress difference.
ISOCLINIC marks the principal direction φ as α and β change.
Use a centered DISC with PUSH to see the symmetry and load scaling clearly.

MODEL LIMIT

No material constants or absolute units

δ = 2πCt(σ1−σ2)/λ is used with a fixed normalized scale. The page reports relative values only. It does not infer C, thickness, or material stress from an image.

FORMULA / CAVEAT

One consistent Jones approximation

δ = 2πCt(σ1−σ2)/λ

A = cos(β−φ)cos(α−φ)e^(iδ/2) + sin(β−φ)sin(α−φ)e^(−iδ/2)

I = |A|² · λ / λ₀ = 0.88, 1.00, 1.16

Here σ1−σ2 is normalized, Ct is represented by the fixed educational scale K = 3.2, and all output is relative. The model does not solve a full elasticity boundary-value problem.

OBSERVATION POLICY

This observatory is a deterministic, static 2D teaching surrogate. It displays relative principal-stress difference, not an absolute material stress measurement. It does not measure a visitor, a device, or a physical specimen.