pyLife – a general library for fatigue and reliability

pyLife is an Open Source Python library for state of the art algorithms used in lifetime assessment of mechanical components subjected to fatigue.

Purpose of the project

This library was originally compiled at Bosch Research to collect algorithms needed by different in house software projects, that deal with lifetime prediction and material fatigue on a component level. In order to further extent and scrutinize it we decided to release it as Open Source. Read this article about pyLife's origin.

So we are welcoming collaboration not only from science and education but also from other commercial companies dealing with the topic. We commend this library to university teachers to use it for education purposes.

The company Viktor has set up a web application for Wöhler test analysis based on pyLife code.

Status

pyLife-2.1.x is the current release the you get by default. We are doing small improvements, in the pyLife-2.1.x branch (master) while developing the more vast features in the 2.2.x branch (develop).

The main new features of the 2.2.x branch is about FKM functionality. As that is quite a comprehensive addition we would need some time to get it right before we can release it as default release.

Once 2.2.x is released we will probably stick to a one branch development.

Contents

There are/will be the following subpackages:

• stress everything related to stress calculation

  • equivalent stress
  • stress gradient calculation
  • rainflow counting
  • ...

• strength everything related to strength calculation

  • failure probability estimation
  • S-N-calculations
  • local strain concept: FKM guideline nonlinear
  • ...

• mesh FEM mesh related stuff

  • stress gradients
  • FEM-mapping
  • hotspot detection

• util all the more general utilities

  • ...

• materialdata analysis of material testing data

  • Wöhler (SN-curve) data analysis

• materiallaws modeling material behavior

  • Ramberg Osgood
  • Wöhler curves

• vmap a interface to VMAP

License

pyLife is open-sourced under the Apache-2.0 license. See the LICENSE file for details.

For a list of other open source components included in pyLife, see the file 3rd-party-licenses.txt.