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Fatigue Analysis of Composite Materials

Composite materials offer many advantages that are leading to rapidly increasing use in various industries. Designers have found composite materials particularly attractive in the development of lightweight vehicles and structures due to their high ratios of stiffness and strength to weight.

Effective use of materials and efficient development of new designs require CAE simulation techniques capable of modelling structural performance and possible failure modes, including fatigue. While offering many benefits, the use of composite materials also presents many challenges to the analyst. These challenges are due to the fact that composite parts and structures are in general inhomogeneous and anisotropic, and may fail as a result of different and possibly interacting failure mechanisms. The composite fatigue analysis module in nCode DesignLife aims to provide the design analyst with tools to help improve and optimise the durability of composite components

Features of Modeling Fatigue Damage of Composite Components:

  • Make fatigue calculations on composite components in an easy-to-use graphical user environment with all the standard features of nCode DesignLife (interactive or batch processing, etc.)
  • Read FE results from composite shell or conventional solid elements
  • Stresses calculated using a strongly coupled Digimat-FE analysis are also supported
  • Simulate complex loading scenarios using any time domain method (static or modal superposition, duty cycles, etc.)
  • Predict damage and life per layer and integration point
  • Incorporate results of manufacturing simulation including fibre orientation tensors or residual stresses
  • Model local fatigue properties based on microstructure (orientation tensor) and stress state
  • Unique solution for handling multiaxial stress states
  • Fatigue calculations based on principal stresses or critical plane
  • Choice of fatigue property model - SN curve interpolation or interface to Digimat
  • Use homogenized matrix or fibre stresses as well as the usual composite ones
  • Convenient post-processing tools