Community Research and Development Information Service - CORDIS


FIMAC Report Summary

Project ID: 632420
Funded under: FP7-JTI
Country: Italy

Final Report Summary - FIMAC (FAST impact cross-analysis methodology for Composite leading edge Structures)

Executive Summary:
During the efforts of this work, the development of an integrated numerical and test approach for composite wing leading edge hailstone impact with electrical ice protection system was accomplished. The work was divided into testing of a building block of coupons, flat and curved panels, and wing leading edge with deicer and the simulation which accurately modeled the tested structures. The tool showed quick results to determine the effect of wing leading edge and heater damage on the heating capabilities. The toolset is a validated tool to determine wing leading edge ice impact damage and survivability.

Damage sizes for all components tested were comparable to those predicted by simulation. The heating capability of the heater in simulation pre impact matched test and furthermore, post impact was able to show that heater damage can affect the wing leading edge temperature distribution.

See deliverables and final report attachment.

Project Context and Objectives:
For the numerical portion, finite element free fast impact models were verified with test. The numerical tools will consist of a semi-analytical impact model (SAIM) which will provide rapid predictions of the impact force-time response and a reduced phenomenological impact model (PIM) which will provide estimates of the maximum impact force. These were integrated with Material Characterization and Qualification (MCQ) software and multi-scale progressive failure dynamic analysis (GENOA PFDA), to characterize the impact resistance of composite structures and to determine: type of failure (delamination, crippling, etc.), damage footprint (which ply, length and width), energy absorbed during impact, post-impact residual strength and post-impact deicing capability.
Test plan was executed and followed a building block approach that included all materials and subcomponents of WLE (glass composite, honeycomb, bond, aluminum) and the WLE.
A high-fidelity numerical model was validated to predict hail damage of composite leading edge structures and heating element damage and performance after impact. The tool can be used to facilitate inspection and maintenance of critical areas for prolonged operational safety.
The project is divided into Work Packages 1-6:
WP1 - Definitions and Specifications has deliverables (1) Report on Test Bench and Numerical Tool Specifications
WP2 - Impact Modeling Tool Development has deliverables (1) 1st Release of Numerical Tool Validated Against Numerical Results
WP3 - Building Block Test Program has deliverables (1) Report on Impact Test-Bench
WP4 - Impact Test-Bench Development has deliverables (1) First issue of impact test bench, (2) Delivery of all specimen, and (3) Material Characterization.
WP5 - Preliminary Tool Validation has deliverables (1) 2nd release of the Numerical Tool and (2) Final impact test bench.
WP6 - Total Tests Plan And Completion Of The Numerical Tool has deliverables of the (1) final numerical tool and (2) report on conclusions and recommendations.

Project Results:
All objectives of the project have been complete and the following conclusions and recommendations have been made. An integrated tool has been utilized to show damages post impact and changes in heating capabilities. Testing and simulations were performed from material to structural level in a building block manner to reduce risk of designing upper level components.
The testing campaign showed that damage detection from two methods a C Scan and Bond Master are viable methods to detect damage. Testing showed that the impact event is fast and correlation of numerical tools with strain measurement was done instead of force vs time.
Simulation showed that damage detection could be detected in sized comparable to test. The effects on heat loss were obtained in an efficient manner with 30 minute back to back impact-heat simulations.

See deliverables and final report attachment.

Potential Impact:
At the end of this project, phenomenological models based similarity laws and characterization diagrams were developed and validated for LE composite structure. They were synergistically integrated with MCQ to enable quick estimations of impact damage and damage resistance. Through cross-correlations with experimental data, the models were evaluated, calibrated and improved to the point where they provided impact and damage characterization data for future preliminary designs and testing of LE structures with deicer.

List of Websites:
Alpha Consulting Services
University of Patras

Related information

Reported by

Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top