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Report

Teaser, summary, work performed and final results

Periodic Reporting for period 1 - INNOHYBOX (Innovative solutions for metallic ribs or fittings introduced in a composite box to optimally deal with thermo-mechanical effects)

Teaser

Summary

Today design of hybrid aircraft structures, such as wings of the business jet where skin and spar could be made in composite and internal ribs in aluminium, requires more robust models to understand the design drivers for components and assembly optimization to lead to weight optimization.

Clearly, the benefit for the society will that the design of hybrid structures optimized in weight will bring to less fuel consumption then generating less CO2 emissions.

The objective of this INNOHYBOX is to develop a thorough understanding of the thermomechanical behaviour of a hybrid box with composite panels but including metallic ribs or fittings.
A building-up approach, from different materials CTE characterization up to the validation of a whole box assembly section, will be carried out to develop and validate the capacity to properly model the thermomechanical effect in hybrid assemblies.

Based on this developed methodology, innovative design solutions will be studied for the metallic components of a composite wing-box.

Work performed

From the begining the following main activities has been carried out:

An accurate characterisation of thermal behaviour, starting with a thorough CTE evaluation of materials and composite through the full temperature range, considering laminate effect, moisture effect, etc.

Started to develop the modellization in parallel of physical testing to demonstrate the capability to correctly evaluate the thermal behaviour of a composite box housing metallic components.

The results are:

Test results at coupon level are done
Sub-element test are defined and on going
Winb box demostrator has been designed
First models with identification of hot spot has been implemented

Final results

The use of more accurate models to predict the thermomechanical behavoir of hybrid strcutures (metal/composite) will allow design optimization vs conservative models of today\'s design methodologies. The design optimization will lead to weight reduction the weight reduction will lead to CO2 emissions reducitons to benefit the overall society.

The expected results at the end of the project are:

1. To provide an accurate characterisation of the hybrid composite box thermal behaviour, starting with a thorough CTE evaluation of materials and composite through the full temperature range, considering laminate effect, moisture effect, etc.
2. To study the thermal influence at the component and assembly levels (closed box) to validate the modellization of thermal loads. The component level will allow to properly identify the sliding behaviour of an assembly of two components (considering typical assembly parameters such as fasteners, tolerances, liquid shim, sealant, paint, etc.).
3. To develop the modellization in parallel of physical testing to demonstrate the capability to correctly evaluate the thermal behaviour of a composite box housing metallic components.
4. A thermomechanical characterisation of complete box sections is expected to validate the modellization capability. A larger closed box section shall provide a global validation of how the different components react and adjust with thermal loading.
5. To perform a design phase, following and based on the previous points, to propose new solutions for ribs and another type of metallic component, such as a spar, selected with the Topic Manager (optimisation of the actual architecture or new design such as topological solutions bearing in mind the combination of the thermal constraints with other loads).