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SM(AG28): Impact damage and repair of composite structures
Contents Management Completion of milestones Management · Monitoring Responsable: Prof. K. Rohwer (DLR) · Chairman: Mrs. F. Roudolff (ONERA) ·
Vice-Chairman: Mr. B. Falzon ( The primary objective of the Action Group is to develop and validate methods, which are able to characterise real impact damage in composite structures and to study the durability of bonded repairs under fatigue loading. The secondary following objectives were defined: 1. Predict and characterise impact
damage (type, size, geometry, constitutive properties, ...); 2. Analyse panels with impact damage,
which are designed for postbuckling; 3. Study the durability of bonded
repairs to composite structures subjected to low energy impact; 4. Develop, improve and validate
fatigue prediction codes as part of an integrated safety-engineering concept.
Main achievements Meeting 4 was held on the 1 April 2004 at NLR in Available results from QinetiQ and -
Impact response for two materials; -
Impact response for two impact velocities (medium and
low); -
Materials properties and damage area.
For WE2 on postbuckling with delaminations, For WE3 on repair, the literature survey on composite repairs and data
collection from previous programmes was presented. It was decided to include
both contributions in the same report to be available on the website in pdf
format. Regarding WE4, ONERA’s contribution to the report on literature
survey on fatigue modelling and experiments was received. It was decided to
publish the global report. A second meeting was held on 29
September 2004 in Säröhus, near For WE1 on the prediction and characterisation of impact damage,
SICOMP sent a paper on the experimental characterisation of in-situ
properties of impact damage based on fractography (WE1-b).
Regarding WE2, a CD that contains data for 8 benchmarks was presented
and distributed to the partners. For WE3, it was recalled that some
data from BAe Systems are included in the WE3-ab report to be found on the
website. Partners involved in the modelling part of this Work Element were
asked to give some feedback on the data (ONERA, NLR, Airbus-D, CIRA, Finally, the test plan to be
executed at DLR in WE4 was presented. In addition, the website was regularly updated in 2004. It includes a
public part that gives an overview of the work performed in each Work Element
and a private part that allows the exchange of data. The address of the
website is: http://www.onera.fr/garteur/sm-ag28 Resources
Completion of milestones
Low energy impact is critical for damage tolerance of composite
structures. It may create superposed delaminations at the layer interfaces
and the material has often to be repaired by bonding. The durability and the
efficiency of bonded repair to composite structures subjected to loading
(including fatigue loading) become crucial. In recognition of the need to
reduce testing costs, SM(AG28) will allow the development of reliable
prediction methods for repaired structures. The group draws on the experience
of more than twenty experts from industry, research institutions and
universities throughout The improved understanding gained from involvement in SM(AG28) will
allow the development of reliable prediction methods for repaired structures
what should reduce testing costs. The AG will also provide a good
view on the present state-of-the-art on the topics studied. The results will
be published in journals and/or will be presented at conferences. First
results were presented at “The 15th SICOMP Conference on
Manufacturing and Design of Composites” in Säröhus (Sweden),
September 27-28, 2004. A general presentation on the SM(AG28) activities was
given as well as two talks from Imperial College and SICOMP. Management Issues As it was planned in 2003,
ESA-ESTEC participated to the group as a new partner and Mr. A. Obst
presented its interests in the project during the meeting held at NLR. AG membership
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Last Update : 22 June 2005 |
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