EADS Composite LIR Analysis Using Abaqus FEA

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EADS Composite LIR Analysis Using Abaqus FEA

Case study showing how EADS used Abaqus FEA to analyze composite load introduction structures for aircraft wing flaps, reducing weight and manufacturing costs.

Published

June 4, 2026

Read time

3 min read

Source

EADS Innovation Works applied SIMULIA Abaqus FEA to evaluate a composite load introduction rib (LIR) for aircraft high-lift systems. The analysis addressed variable ply thicknesses, chamfered edges, resin pockets, and 324 rivet connections using 3D solid elements and the implicit solver. Results confirmed that in-plane and transverse stresses remained within limits and all rivet loads were satisfied, enabling a simplified pre-form geometry that supports automated lay-up and lower production costs.

Key takeaways

Abaqus 3D solid elements modeled variable-thickness composite lay-ups and resin pockets for accurate stress results.

Transverse shear and peel stresses were evaluated to confirm delamination resistance at the LIR attachment points.

All 324 rivets met strength requirements under multiple load cases using the implicit solver.

Simplified uniform-thickness pre-form design reduced manufacturing complexity while maintaining structural performance.

Composite LIR replaced metal fittings, cutting component weight and eliminating thermal-expansion mismatch.

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