| Task 5.3 – Discretization and implementation of the material models in the FEA software
The work related to ABAQUS employed both standard and user-customizable features of the software. The models developed included i) a heat transfer analysis for the temperature distribution inside the composite, the state of pyrolysis of the polymer matrix and the oxidation of fibre reinforcements; ii) a new user defined subroutine for the internal heat generation that occurs during pyrolysis; and iii) implementing a thermal-mechanical model with a transversely isotropic material representation, and temperature and residual resin content dependent elastic constants. The thermal models (i and ii) received parameters from the same experiments as the FDS pyrolysis models. Parameters for the mechanical model (iii) were obtained from Dynamic Mechanical Thermal Analysis (DMTA). An example of temperature dependent mechanical behaviour present in the models is shown in Figure .
Figure . ABAQUS thermal-mechanical modelling of the furan+glass fibre laminate: (a) DMTA test result for the neat matrix, storage modulus and (3°C/min, 1 Hz), and (b) simulated longitudinal modulus for the NCF UD layer with wavy fibres (modulus calculated using rule-of-mixtures is also included).
The implementation and verification of the FEA material models was reported in Deliverable D5.3.
Relevant benchmark materials and FIRE-RESIST composites were characterized using TGA, cone calorimetry and DMTA to model their thermal and mechanical behaviour both at ambient conditions and during their thermal decomposition process. These material models were later employed for validation purposes of WP5 Task 5.5, as well as in the modelling of the maritime demonstrator experiment of WP6.
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