F13LD.lab
Rigorous stiffness analysis: full-field FFT homogenization on the GPU, returning the complete elastic tensor and a directional-stiffness surface for a recipe.
What it does.
F13LD.lab computes the effective elastic stiffness of a recipe by solving the periodic homogenization problem on a voxel grid with a GPU FFT solver. It returns the full Voigt 6×6 stiffness matrix and a directional-stiffness surface — a step beyond the fast estimates the design tools show inline.
Lab is live but still being refined.
Where it fits.
Lab is the rigorous-analysis stop, off to the side of the main corpus flow. The design tools and sweep give a fast stiffness estimate; lab gives the full tensor when accuracy matters.
Worked example: a stiffness solve.
Import a recipe
Load a design recipe (from a tool, a file, or a link).
Set grid and material
Choose the voxel resolution and the parent material Eₛ and ν.
Solve
The GPU FFT-CG solver iterates to the converged strain field and reads off the full Voigt 6×6 stiffness.
Read the surface
The directional-stiffness surface shows stiffness by direction; the Zener ratio follows from the tensor.
Accuracy rises with grid resolution — and so does cost. Converge the resolution before trusting the last digits.
Output.
The full Voigt 6×6 stiffness matrix and the directional-stiffness surface. Reading them is covered in homogenization and anisotropy & Zener.