This repository has moved to gitlab.git.nrw/rwth-cscp/code/bmcs_shell (2026-10). This GitHub copy is archived and read-only; it keeps the history up to the move.

BMCS Shell

Framework for numerical modeling and the development of geometries and production processes of brittle-matrix composite shells. Repository: gitlab.git.nrw/rwth-cscp/code/bmcs_shell (moved from github.com/bmcs-group/bmcs_shell in 2026-10). Currently, the focus is on developing flexible foldable shell geometries based on origami waterbomb patterns.

Content

Geometry

• Waterbomb-based geometries

  • Shells based on symmetric 4 parameters waterbomb base

  • Slabs based on Symmetric 4 parameters waterbomb base
    

  • Shells based on semi-symmetric 5 parameters waterbomb base

Numerical structural analysis

The folded shell as a membrane of flat facets — three translations per node, plane-stress elasticity, thickness h — solved by ibvpy 1.x (rwth-cscp/code/ibvpy on git.nrw) (bmcs_shell.folding.analysis.membrane; the interactive model WBShellAnalysis). Supports that leave a zero-energy mode are refused with the nodes that move. Until 2026-10 this ran on a fork of the archive bmcs_ibvpy; tests/test_membrane_analysis.py holds the new code to the fork's own results.

Production processes

Pending

Installation

A local environment without conda:

python3.12 -m venv .venv
.venv/bin/pip install numpy scipy sympy traits matplotlib k3d ipywidgets ipympl ipytree meshio pytest
.venv/bin/pip install -e ../bmcs_utils -e ../ibvpy -e .
.venv/bin/pytest tests

Do not install bmcs-ibvpy (the archive) into the same environment: its top-level package is also called ibvpy.

Dependencies

Dependencies on gmsh and pygmsh included in environment.yml Anaconda versioning seems not up to date.

Problem with dependencies in pyface with a missing dependency on anaconda cloud. As a fix,importlib-resources that was reported as missing has been included in environment.