FFPACK - Fatigue and Fracture PACKage
Purpose
FFPACK
( Fatigue and Fracture PACKage ) is an open-source Python library for fatigue and fracture analysis. It supports ASTM cycle counting, load sequence generation, fatigue damage evaluation, etc. A lot of features are under active development. FFPACK
is designed to help engineers analyze fatigue and fracture behavior in engineering practice.
Usage
The following example shows the usage of ASTM rainflow counting,
# Import the ASTM rainflow counting function
from ffpack.lcc import astmRainflowCounting
# Prepare the data
data = [ -2.0, 1.0, -3.0, 5.0, -1.0, 3.0, -4.0, 4.0, -2.0 ]
# Get counting results
results = astmRainflowCounting( data )
See the package document for more details and examples.
Status
FFPACK
is currently under active development.
Contents
Fatigue damage model
Palmgren-miner damage model
Naive Palmgren-miner damage model
Classic Palmgren-miner damage model
Load counting and correction
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
Four point counting
Four point rainflow counting
Mean stress correction
Goodman correction
Soderberg correction
Gerber correction
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
Sequence from spectrum
Spectral representation
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
Four point rainflow counting matrix
Wave spectra
Jonswap spectrum
Pierson Moskowitz spectrum
ISSC spectrum
Gaussian Swell spectrum
Ochi-Hubble spectrum
Wind spectra
Davenport spectrum with drag coefficient
Davenport spectrum with roughness length
EC1 spectrum
IEC spectrum
API spectrum
Sequence spectra
Periodogram spectrum
Welch spectrum
Random and probabilistic model
Metropolis-Hastings algorithm
Metropolis-Hastings sampler
Au modified Metropolis-Hastings sampler
Nataf algorithm
Nataf transformation
Risk and reliability model
First order second moment
Mean value FOSM
First order reliability method
Hasofer-Lind-Rackwitz-Fiessler FORM
Constrained optimization FORM
Second order reliability method
Breitung SORM
Tvedt SORM
Hohenbichler and Rackwitz SORM
Simulation based reliability method
Subset simulation
Utility
Aggregation
Cycle counting aggregation
Counting matrix
Counting results to counting matrix
Derivatives
Derivative
Central derivative weights
Gradient
Hessian matrix
Digitization
Sequence digitization
Fitter
SN curve fitter
Sequence filter
Sequence peakValley filter
Sequence hysteresis filter
Document
You can find the latest documentation for setting up FFPACK
at the Read the Docs site.