BenjaminETaylor / bjsfm

Bolted Joint Stress Field Model

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.analysis import MaxStrain
    a_matrix = [[988374.5, 316116.9, 0.],
                [316116.9, 988374.5, 0.],
                [0., 0., 336128.8]]
    thickness = 0.1152
    diameter = 0.25
    analysis = MaxStrain(a_matrix, thickness, diameter)

    # get stresses, strains and displacements at four points around hole
    bearing = [100, 0]  #[Px, Py]
    bypass = [100, 0, 0]  #[Nx, Ny, Nxy]
    analysis.stresses(bearing, bypass, num=4)
    analysis.strains(bearing, bypass, num=4)
    analysis.displacements(bearing, bypass, num=4)

    # plot stresses
    analysis.plot_stress(bearing, bypass)

Installation

pip install bjsfm

Documentation

https://bjsfm.readthedocs.io

Features

• Lekhnitskii's anisotropic elasticity solutions for loaded (cosine distribution) and unloaded holes
  • stresses
  • displacements
• Combined bearing and bypass 2D infinite plate stress distribution
• Optional DeJong tension (or compression) finite width correction
• Max strain analysis
• Plotting
  • stresses
  • displacements
• Command-line Interface (CLI)

Web App

https://www.centricengineers.com/free-software/ce-bjsfm

Contribute

• Issue Tracker: https://github.com/BenjaminETaylor/bjsfm/issues
• Source Code: https://github.com/BenjaminETaylor/bjsfm

Support

[e-mail]

License

This project is licensed under the MIT license.