Log in to use our free company, program and sector update tracker feature.
 

September 2006 edition

Quantifying methods for the evaluation of carbon-based composite surfaces for subsequent adhesive bonding

By Wichita State University experts William T.K. Stevenson, Irish Alcalen, Lamia Sa

The production of fibre-reinforced composite parts has revolutionised the aviation industry due to properties such as high specific stiffness and resistance to environmental deterioration, but composite parts can potentially be damaged both during fabrication and during use, and composite repair is still an expensive and delicate process.

If a defect is found after cure and during assembly, or if a defect is introduced through wear and tear, the defect must be cut out, replaced with prepreg and cured and bonded in place. In order for a repair to be effective, the prepreg must form a strong bond with the precured composite surface. This type of composite repair is both labour-intensive and expensive and directly impacts manufacturing and maintenance costs.

Fibre-reinforced composites absorb water into the resin phase, mostly during use or in storage under a humid atmosphere. Before a strong bond can be formed, the composite must be thoroughly dried. This can take hours of heating and vacuum pumping the composite before the bond is formed with new prepreg. There is a need for a simple nondestructive test that can be used to identify whether the composite is wet or dry, both on the shop floor and in the field.

Water dissolved in plastic produces a unique and reproducible signature in the near Infrared (IR) spectrum. Transmission near IR spectroscopy can be used to look into and anal....

Full report (946 words) is available by subscription:  

Tell a friend/colleague about this story:

 

 

 Contact details from our directory:
National Institute for Aviation Research Certification Services, Fatigue Testing, Computer-aided Testing, Prototyping, Aerodynamic Test Services, Composite Testing Services, Corrosion Testing Services, Fracture Testing Services, Non-Destructive Testing, Inspection Service, Electromagnetic Test Services, Environmental Testing Services, Stress Analysis, Computer-aided Design, Additive Manufacturing
Thermo Fisher Scientific Non-Destructive Test Equipment, X-Ray Equipment, Chemical Analysers

Subscribers are able to access the full text of articles on this web site, and in a downloadable PDF newsletter. If you have a subscription already then please log in, otherwise see our latest subscription offers.

Enhanced listings:


AC Products, Inc.
Full line of peelable maskants for chemical milling, etching, anodizing, acid stripping, plating and more.

EWI
The leading engineering technology organization in North America dedicated to developing, testing and implementing manufacturing technologies for industry.

ESPEC North America Inc. | Qualmark
Qualmark is your industry leading manufacturer and partner for accelerated reliability testing, HALT and HASS, for all commercial and defense avionics.

Interface Force Measurements Ltd
Accurate & reliable torque, force & pressure sensors, pressure mapping systems & calibration systems.

Oerlikon Balzers AG
Oerlikon Balzers is one of the world’s leading suppliers of surface technologies

See our advertising tariff.

 

8
data pages remaining in monthly quota for non-subscribers

© Airframer Limited, operated under licence by Stansted News Limited 2018. Terms & Conditions of reading. Privacy policy