Short Fibre Composite


The fatigue of composites poses particular challenges for engineers because the properties of the constituent parts, polymer matrix and fibres, interact to determine the fatigue properties, which vary in each location and direction. The Short Fibre Composite option uses a stresslife approach for the analysis of anisotropic materials such as glass fibre filled thermoplastics.
The stress tensor for each layer and section integration point through the thickness is read by DesignLife from FE results. The material orientation tensor describing the “fibre share” at each calculation point and direction is provided by mapping a manufacturing simulation to the finite element model. This orientation tensor can be read from the FE results file or supplied from an ASCII file.
The Short Fibre Composite analysis requires standard materials data of typically two or more SN curves for differing fibre orientations. DesignLife uses this data to calculate an appropriate SN curve for each calculation point and orientation. DesignLife capabilities such as multiple variable amplitude loads and duty cycles are also supported for composites.
  • Stresses can be from regular FE results or from calculations with a composite material model from DIGIMAT. In this case, the averaged matrix and fibre stresses will be available in addition to the overall composite (macro) stresses.
  • Primarily aimed at the fatigue analysis of short fibre composites, it can also be applied to laminar composites where failure modes due to interlaminar stresses can be ignored.
  • A set of one or more SN curves based on fibre share is used to determine the SN curve for each calculation point and orientation.
  • Stress combination methods are provided for critical plane and absolute maximum principal stress.
Relationship Files

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