Stress-Strain Plotter

Upload stress-strain file

CSV/TSV or TXT with comma- or tab-separated columns and one pair per line.

Reference dataset

Loads Al2024-T351.csv with its header row (MPa units).

Data includes header row

Stress units

Show true stress-strain

Plot stress range

Leave blank for no limit (numeric values only).

Plot strain range

Leave blank for no limit (numeric values only).

Fit line range

Line numbers refer to data rows (header excluded).

Elastic modulus E (for plastic strain)

Used to compute plastic strain: ep = etrue - sigma_true / E.

Plastic output strain step

Generates true plastic strain values from yield to UTS using this increment.

Plastic region data (true plastic strain, true stress)

Shown when the plastic region is selected and E is provided.

Power hardening dataset (from inputs) Yield stress (0.2%) Young's modulus E UTS Hardening coefficient H Hardening exponent n Points (p) Spacing

Even stress (sigma) Even plastic strain

Load from workbook row

Input summary

Awaiting inputs...

Range: --

Stressstrain curve estimated by power hardening

Awaiting inputs...

Output columns: Plastic strain for Ansys input, stress. Uses eps = (sigma/H)^(1/n) and strain = eps - sigma/E.

Stress-strain data (comma or tab separated)

Data table

Awaiting data...

#	Strain	Stress	True strain	True stress	Plastic strain (true)

Data column plot

Plot

Regression

Awaiting data...

Summary uses selected range

Diagnostics Enable diagnostics logging Log key presses Include full data textbox in logs

Diagnostics: OFF

When running via python server.py, logs are also written to stress-stain.log.

Fit source: auto-selection.

Legend: >> = within active range

Input rules: Use commas, tabs, or new lines between every number. Pairs are read as strain then stress.

Plot

Awaiting data...

Yield (0.2%): --

UTS: --

Engineering

True

Region fit

Regression

Young's Modulus: --

Yield (0.2%): --

UTS: --

Tangent modulus: --

Power hardening: --

Regression: --

R2: --

Awaiting fit segment...

Power hardening fit (log-log)

Awaiting plastic range...

Regression: --

Derived from the loaded engineering curve: ε_true = ln(1+ε_eng), σ_true = σ_eng·(1+ε_eng). Estimate E from the initial linear (elastic) region, then ε_pl = ε_true − σ_true/E. Fit Hollomon by log-log regression: σ_true = K·(ε_pl)^n → ln(σ_true) = ln(K) + n·ln(ε_pl).

Plastic region cubic fit

Awaiting plastic region data...