67-change-in-stl…

stiffness_matrix.py
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			#!/usr/bin/env python3
			__copyright__ = (
			"Copyright (©) 2019-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)"
			"Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)"
			)
			__license__ = "LGPLv3"


			import akantu as aka


			def getStiffnessMatrix(material_file, mesh_file, traction):
			aka.parseInput(material_file)
			spatial_dimension = 2

			# --------------------------------------------------------------------------
			# Initialization
			# --------------------------------------------------------------------------
			mesh = aka.Mesh(spatial_dimension)
			mesh.read(mesh_file)

			model = aka.SolidMechanicsModel(mesh)
			model.initFull(_analysis_method=aka._static)

			model.assembleStiffnessMatrix()
			K = model.getDOFManager().getMatrix('K')
			stiff = aka.AkantuSparseMatrix(K).toarray()

			return stiff


			# --------------------------------------------------------------------------
			# main
			# --------------------------------------------------------------------------
			def main():
			mesh_file = 'plate.msh'
			material_file = 'material.dat'

			traction = 1.
			mat = getStiffnessMatrix(material_file, mesh_file, traction)
			print(mat)


			# --------------------------------------------------------------------------
			if __name__ == "__main__":
			main()