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Method development to calculate composite fatigue life

FEA (Finite Element Analysis)

Method development to calculate composite fatigue life

We developed an iterative method, which combines acknowledged literature results with the possibilities of the finite element method.

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The method includes:

  • load type dependent mean-stress correction (fiber direction and perpendicular tension / pressure and shear) using Haigh diagram,
  • prediction of the degradation of elastic material properties and strengths per cycle,
  • failure analysis per cycle based on degraded material properties using a 1st ply failure model (Puck),
  • compact software integrated into Ansys environment.

This was a subtask of a project funded by the National Research, Development and Innovation Fund (NKFIH), Project title: “Production of polymer products by a short cycle time, automatized production technology for automotive applications, with exceptional focus on the complexity and recyclability of the composite parts”; The application ID number: NVKP_16-1-2016-0046.


L. Takacs, L. Kovacs, T. Olajos, Numerical tool with mean-stress