Safe Technology Ships fe-safe/Composites for Woven Fibers
UK, May 29, 2013 - Safe Technology Limited, announces a new and unique
capability for the fatigue analysis of woven fibers from finite element models.
The tool is included in the latest release of fe-safe/Composites, the add-on
module to the Safe Technology’s advanced suite of fatigue analysis software for
finite element models, fe-safe. This release extends the fatigue of composites
module’s capabilities from unidirectional laminae, to include plain woven
This new capability was developed by a consortium of companies led by Safe
Technology and Firehole Composites (recently acquired by Autodesk, Inc). The
methodology was refined using materials and test data from three leading
engineering companies: DSO National Laboratories, Singapore, Royal National
Lifeboat Institute (RNLI), UK, and Daimler AG, Germany. These companies
represent key industries for whom the new woven fiber fatigue life capability
has particular relevance; namely the defense, aerospace, marine and
automotive/ground vehicle sectors. Wind turbine blade manufacturers will be
another obvious sector to benefit; the unidirectional materials capability has
already been successfully tested and verified with turbine blade applications.
The latest release of fe-safe/Composites expands the current capabilities of the
product to new microstructures and loading definitions, while retaining the
functionality of the previous versions. This latest version supports fatigue
life predictions of plain woven microstructures using the same unique physics
based solution as that already applied to unidirectional composites.
Implementation of the physics based solution, the kinetic theory of Fracture,
allows fatigue life predictions to be completed for multiaxial load states for
which the material is not characterized, an extremely powerful tool for any
engineer, from designer to analyst.
Additionally, the latest release of fe-safe/Composites has expanded the
applicable loading definitions within the fe-safe environment to allow for
multiple repeats and block loadings. Block loadings and multiple repeats are
very useful for defining complex duty cycles, and are utilized widely by wind
turbine blade manufacturers and other industries subjected to design lives of
anywhere from several months to many years.
The fatigue solution is based upon the kinetic theory of fracture and applied to
the matrix constituent of the woven microstructure, which makes the solution
load, time, temperature, and material dependent. Hysteresis heating is accounted
for through the use of Newton’s law of cooling, and its effect is included in
the fatigue life solution. Finally, the effects of material healing at low
stress levels has been included to accommodate infinite life scenarios often
encountered in analyses with low loads applied for long time histories. Initial
tests revealed excellent correlation between the experimental and predicted
lives of the woven lamina, which provides evidence of a physically realistic
approach to modelling the fatigue behaviour of woven materials.
The new release of fe-safe/Composites is now supported on Linux and Windows 64
bit, expanding the software’s potential to a wider range of customers and uses.