ffpack 0.3.0

Fatigue and fracture package

FFPACK - Fatigue and Fracture PACKage

Purpose

FFPACK ( Fatigue and Fracture PACKage ) is an open-source Python library for fatigue and fracture analysis. It supports cycle counting with ASTM methods, load sequence generators, fatigue damage evaluations, etc. A lot of features are under active development. FFPACK is designed to help engineers analyze fatigue and fracture behavior in engineering practice.

Installation

FFPACK can be installed via PyPI:

pip install ffpack

Status

FFPACK is currently under active development.

Contents

• Fatigue damage rule

  • Palmgren-miner damage rule
    • Naive Palmgren-miner damage rule
    • Classic Palmgren-miner damage rule

• Load correction and counting

  • ASTM counting
    • ASTM level crossing counting
    • ASTM peak counting
    • ASTM simple range counting
    • ASTM range pair counting
    • ASTM rainflow counting
    • ASTM rainflow counting for repeating history
  • Johannesson counting
    • Johannesson min max counting
  • Rychlik counting
    • Rychlik rainflow counting

• Load sequence generator

  • Random walk
    • Uniform random walk
  • Autoregressive moving average model
    • Normal autoregressive (AR) model
    • Normal moving average (MA) model
    • Normal ARMA model
    • Normal ARIMA model

• Load spectra and matrices

  • Cycle counting matrix
    • ASTM simple range counting matrix
    • ASTM range pair counting matrix
    • ASTM rainflow counting matrix
    • ASTM rainflow counting matrix for repeating history
    • Johannesson min max counting matrix
    • Rychlik rainflow counting matrix
  • Wave Spectra
    • Jonswap spectrum
    • Pierson Moskowitz spectrum

• Random and probabilistic model

  • Metropolis-Hastings algorithm
    • Metropolis-Hastings sampler
  • Nataf algorithm
    • Nataf transformation

• Risk and reliability model

  • First order second moment
    • fosmMVAL
  • First order reliability method
    • formHLRF
    • formCOPT

• Utility methods

  • Cycle counting aggregation
  • Counting results to counting matrix
  • Fitter for SN curve
  • Sequence peak and valleys
  • Sequence degitization

Document

You can find the latest documentation for setting up FFPACK at the Read the Docs site.