Engineering
Stress-Strain Curve
σ = 300·tanh(8ε) + 20ε
A ductile metal loads up nearly linearly, yields at the knee, then work-hardens along a gentle plastic slope toward its ultimate strength.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).