robbievanleeuwen / feastruct

A python package for structural finite element analysis.

feastruct

structural finite element analysis, the pythonic way.

from feastruct.pre.material import Steel
from feastruct.pre.section import Section
import feastruct.fea.cases as cases
from feastruct.fea.frame_analysis import FrameAnalysis2D
from feastruct.solvers.linstatic import LinearStatic
from feastruct.solvers.feasolve import SolverSettings

# ------------
# preprocessor
# ------------

# constants & lists
length = 5000  # length of the beam
udl = -10  # value of the udl

# everything starts with the analysis object
analysis = FrameAnalysis2D()

# materials and sections are objects
steel = Steel()
section = Section(area=3230, ixx=23.6e6)

# nodes are objects
node1 = analysis.create_node(coords=[0])
node2 = analysis.create_node(coords=[length])
node3 = analysis.create_node(coords=[2*length, 2500])

# and so are beams!
beam1 = analysis.create_element(
    el_type='EB2-2D', nodes=[node1, node2], material=steel, section=section
)
beam2 = analysis.create_element(
    el_type='EB2-2D', nodes=[node2, node3], material=steel, section=section
)

# boundary conditions are objects
freedom_case = cases.FreedomCase()
n1x = freedom_case.add_nodal_support(node=node1, val=0, dof=0)
n1y = freedom_case.add_nodal_support(node=node1, val=0, dof=1)
n2y = freedom_case.add_nodal_support(node=node2, val=0, dof=1)
n3y = freedom_case.add_nodal_support(node=node3, val=0, dof=1)

# so are loads!
load_case = cases.LoadCase()
udl1 = load_case.add_element_load(beam1.generate_udl(q=udl))
udl2 = load_case.add_element_load(beam2.generate_udl(q=udl))

# an analysis case relates a support case to a load case
analysis_case = cases.AnalysisCase(freedom_case=freedom_case, load_case=load_case)

# ------
# solver
# ------

# you can easily change the solver settings
settings = SolverSettings()
settings.linear_static.time_info = True

# the linear static solver is an object and acts on the analysis object
LinearStatic(analysis=analysis, analysis_cases=[analysis_case], solver_settings=settings).solve()

# ----
# post
# ----

# there are plenty of post processing options!
analysis.post.plot_geom(analysis_case=analysis_case)
analysis.post.plot_geom(analysis_case=analysis_case, deformed=True, def_scale=1e2)
analysis.post.plot_frame_forces(analysis_case=analysis_case, shear=True)
analysis.post.plot_frame_forces(analysis_case=analysis_case, moment=True)
analysis.post.plot_reactions(analysis_case=analysis_case)

Current Capabilities:

Pre-Processor

• Python API
• Input File
• .dxf Import
• Triangular Meshing
• Structure Generator Functions

Finite Element Analysis

• 2D Frame
  • Bar Element
  • Euler Bernoulli Frame Element
  • Timoshenko Frame Element
• 3D Frame
  • Bar Element
  • Euler Bernoulli Frame Element
  • Timoshenko Frame Element
• 2D Membrane (Plane Stress/Plane Strain)
  • 3-Noded Triangular Element
  • 6-Noded Triangular Element
• Plate Elements
• Shell Elements

Element Formulations

• Geometrically Linear
• Geometrically Non-Linear
• Material Non-Linear

Loading/Restraints

• Applied Loads
  • Load Cases
  • Nodal Loads
  • Surface (Distributed) Loads
  • Body Loads
• Restraints
  • Freedom Cases
  • Nodal Supports
  • Nodal Springs
  • Surface (Distributed) Supports
• Analysis Cases

Solvers

• Linear Static Solver
• Non-Linear Static Solver
• Linear Buckling Solver
• Natural Frequency Solver
• Linear Dynamic Solver
• Non-Linear Dynamic Solver
• Multi-Element Solvers

Post-Processor

• Structural Mesh and Boundary Conditions
• Deformed Mesh
• Reaction Forces
• 2D Frame Actions (N, V, M)
• Buckling Mode Shapes
• Natural Frequency Mode Shapes
• Deformed Contour Plot
• Continuum Stress Contour Plot

Additional Modules

• Optimisation