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SM(AG28) ‘Impact damage and repair of
composite structures’ develops and validates methods that are able to
characterise real impact damage in terms of type, size, geometry and
constitutive properties in composite structures. The durability of bonded
repairs, under fatigue loading or not, is also studied.
The improved understanding gained from involvement
in SM(AG28) allows the development of reliable
prediction methods for repaired structures what should reduce testing costs. SM(AG28) also provides a good view on the present
state-of-the-art on the topics studied. A number of results have already been
presented at international conferences and published in academic journals.
Prediction and characterisation of impact
damage: experimental setup and finite element model – SM(AG28)
SM(AG29) ‘Interchangeability
of composite materials’ aims to reduce the high qualification costs for
interchanging composite materials through the development of a probabilistic
methodology that permits the assessment of the interchangeability
of composite materials. The probabilistic methodology permits rapid
predictions of stochastic material properties. Structural reliability is then
predicted from the strength distribution and actual loading data.
In this manner the significance of batch-to-batch and
manufacturer’s variability effects on laminate strength variability are
being established. Also, the suitability of using simplified strength
predictive models for probabilistic analysis is evaluated.
The reliability of deterministically designed structures
is established, and the potential gains of the probabilistically designed
equivalent are investigated.
SM(AG30) ‘High velocity
impact’ focuses mainly on birdstrike-related issues
will but effort is also devoted to modelling the impacted structure, and in
particular consideration is given to novel materials, e.g. composites, and to
the impact on complex structures, particularly pre-stressed components. To
develop design and certification tools for the aircraft industry, especially
for structures under severe loads, additional validation of composites
failure modelling through careful testing of idealised structures coupled to
materials test programmes and simulation studies is necessary. However, such
a comprehensive programme would be far too costly, so the aim is to exchange
materials and test data freely amongst partners, as has been the case so far.
In addition, other impact-related phenomena are investigated,
specifically ice/hail impacts and rubber impacts from tyres.
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