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will take place. The global methods are
aimed at immediate exploitation, and as
such will be implemented into the
industrial partners’ codes of choice and
assessed by those partners. The detailed
methods will be assessed for their
exploitation potential and a path
towards implementation will be drawn
up. Overall, the results from the tests
and analyses will be used to form
design guidelines for composite bolted
joints.
Current status
In the first year of the project, all the
benchmark structures have been designed
and predictions have been made
regarding load distributions and failure
loads. Fabrication has begun and tests
will be complete by the mid-term
assessment. The specimen tests in WP 5
are under way and will also be complete
by mid-term. Modelling of the benchmark
structures with global methods
has been performed, and initial globallocal
models will shortly be ready for
comparison. Interim reports on the
detailed models of the specimen tests
will be supplied at the end of Month 12.
Conclusions
BOJCAS is focused on an enabling technology
for the increased use of composites
in aircraft structural components.
Since joints have such a critical effect on
the safety and efficiency of aircraft
structures, it is vital that the most
advanced design methods are used. A
high potential exists to reduce development
costs, maximise weight savings,
increase manufacturer and operator
confidence in composites, and ensure
safety of future primary composite
structures. The spin-off potential of the
developed technology is very high in
several other fields such as shipbuilding,
space, nuclear, chemical, offshore,
automotive, rail and civil engineering.
Several of the partners in BOJCAS have
been involved for many years in national
programmes on composite bolted
joints. BOJCAS will pool this collective
expertise and provide a European perspective
on this important topic. 
BOJCAS
About the authors:
Michael McCarthy is Director, Composites
Research Centre; and Lecturer,
Department of Mechanical
and Aeronautical Engineering, University
of Limerick, Ireland.
Michael.McCarthy@ul.ie
Figure 5. Analysis of damage progression using microscopy (FOI).
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