WP4 – Material Models Development and Verification

Results

– Continuous integration of the meso-scale modelling capabilities developed in WP4 for different composite materials in successive versions of the software Digimat-FE: 2017.0 (December 2016), 2017.1 (June 2017), 2018.0 (February 2018) and 2018.1 (June 2018). These new capabilities together with pre-existing features or features developed concurrently made it possible to close new deals and contributed to the renewal of licenses by existing customers.

– Engineering projects for industry using not only the newly developed features in Digimat but more importantly the expertise grown in the project. Typical project example: estimation of the behaviour and strength of UD composite materials for different combination of matrix and fiber materials as part of material screening phase for a preliminary design.

– Enhancements to LS-DYNA that have been released with the latest version of LS-DYNA (R9.2 and newer) and made available for all customers:

  • Enhanced strain rate dependent modelling capabilities of Mat_261,
  • Enhanced regularisation capabilities for fracture modelling with SPH discretization,
  • New keyword to define element erosion for composite structures
    These features are critical in engineering practise to model high velocity impact on shell discretized structures.

Prediction of the failure envelope of unidirectional composite materials by means of finite element simulations

Enhancement of Digimat-FE, an existing commercial software product, to make such predictions available to industry

Enhancement of Digimat-FE to extend these capabilities to more complex composites such as 3D woven composites

Coupling of Digimat-FE with LS-Dyna, a commercial finite element package, to use the latter as finite element solver to make stiffness predictions

WP4 experiment simulated in LS-DYNAbyUPAT

Fig. 1. Test for Mode I Interlaminar fracture toughness of unidirectional CFRP material (Airbus Test Method AITM 1-0005)

Fig. 2. Open-Hole compression test for CFRP materials (Airbus Test Method AITM 1-0008)

Fig. 3. Open-Hole tensile test for CFRP materials (Airbus Test Method AITM 1-0007)

Fig. 4. Short-Beam Test  (Standard Test Method ASTM D2344)

Fig. 5. Low-velocity impact test  (Airbus Test Method AITM 1-0010)

Fig. 6. High velocity impact test – Comparison of FE, SPH and Experimental deformation of an aluminium plate.

Fig. 7. High velocity impact test – Comparison of deformation shape of a aluminium plate using FE and SPH method.

 

Fig. 8. Deformation of a single Kevlar plain-woven fabric to High Velocity Impact Test  (Air-gun experiments and FE simulations)