By A.A. Baker Ph.D., L.R.F. Rose, Rhys Jones Ph.D.

The provision of effective and good value applied sciences to fix or expand the lifetime of getting older army airframes is changing into a serious requirement in so much nations worldwide, as new plane changing into prohibitively dear and defence budgets reduce. To a lesser quantity the same state of affairs is coming up with civil airplane, with falling sales and the excessive expense of alternative aircraft.

This booklet appears to be like at repair/reinforcement expertise, that is in keeping with using adhesively bonded fibre composite patches or doublers and will supply within your means existence extension in lots of occasions. From the medical and engineering point of view, when basic in proposal, this know-how could be very tough rather while used to fix fundamental constitution. this is often because of it being according to interrelated inputs from the fields of plane layout, good mechanics, fibre composites, structural adhesive bonding, fracture mechanics and steel fatigue. The applied sciences of non-destructive inspection (NDI) and, extra lately shrewdpermanent fabrics, also are integrated. Operational matters are both severe, together with airworthiness certification, software know-how (including future health and security issues), and training.

Including contributions from top specialists in Canada, united kingdom, united states and Australia, this publication discusses every one of these matters and the newest advancements. most significantly, it comprises genuine histories of program of this know-how to either army and civil aircraft.

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Additional info for Advances in the Bonded Composite Repair of Metallic Aircraft Structure, 2 Volume Set

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7. The reinforcing patch length ( L ) is 77mm. In all cases the addition of the highly-damped patch configuration resulted in a reduction of frequency. The resonant frequency increases by 5%, 10% and 13% for vibration modes 1, 2 and 3, respectively, when the patch width increased from 80 to 126mm. A. 20. 6 Frequencies for original uncracked un-repaired plate. Mode Resonant frequency (Hz) 1 218 314 506 2 3 ooz EOP 80E E61 ase3 ,08/0'Z ase3 LIP 61E ,9ZI/O'Z 19P ZPP E IPE SEE Z 91Z 802 1 (ZH)K ~ u a n b q$ueuosa~ apon *9ZI/O'I ase3 ,08/0'1 ase3 Chapter 19.

0x10-6 1E-12 8 . 0 1E-1 5 100 1000 10000 Frequency ( H r ) Fig. 21. O mm thick damping layer with [0/90] boron/epoxy constraining layer and an 80 mm wide by 77 mm long boron/epoxy reinforcement. constraining layer and a 80 mm wide by 77 mm long boron/epoxy patch. This figure shows that vibration mode 1 contributes up to 99% of the overall stress intensity ( K I ) ~Similar ~ ~ . results were found for all the other highly damped repair configurations investigated. 3. Stress intensity Juctor Stress intensity factors are computed at the inside and outer surfaces of the skin.

A two ply [0/90] laminate and a four ply [0/90],,, laminate. 5, show a significant increase in modal loss factor as the VEM thickness is increased. 125mm thick aluminium constraining layer applied to the reinforcement only. 5 Loss factor of aluminium panel (with no crack) reinforced with a unidirectional boron/epoxy patch of dimensions 77 mm ( L ) x 125 mm (W) with the constrained layer damping treatment applied to whole panel. 0 mm, respectively. With the increase in thickness of the VEM there is also a corresponding drop in damped natural frequency which is mainly due to the increase in mass.

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