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Bolted Joint Stress Field Model

Project description


Bolted Joint Stress Field Model (BJSFM) is a common analytical method used to analyze bolted joints in composite airframe structures. This project ports the original fortran code to pure python code using the underlying theory.

from bjsfm.lekhnitskii import UnloadedHole
a_inv = [[0.1, 0.05, 0.], [0.05, 0.1, 0.], [0., 0., 0.5]]  # inverse a-matrix from CLPT
loads = [100, 100, 50]  # force / unit length
plate = UnloadedHole(diameter=0.25, thickness=0.1, a_inv=a_inv, loads=loads)

# get stresses at four points around hole
plate.stress(x=[0.125, 0., -0.125, 0.], y=[0., 0.125, 0., -0.125])

# plot stresses
from bjsfm import plotting


pip install bjsfm



  • [ ] Lekhnitskii’s anisotropic elasticity solutions for loaded (cosine distribution) and unloaded holes

    • [X] stresses

    • [ ] displacements

  • [X] Combined bearing and bypass 2D infinite plate stress distribution

  • [X] Optional DeJong tension (or compression) bearing correction

  • [X] Max strain analysis




This project is licensed under the MIT license.

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