The effect of titanium insert repairs on the static strength of CFRP coupons and joints

The effect of titanium insert repairs on the static strength of CFRP coupons and joints In engineering industry, the panels manufacturing implicates the risk of having defects or damages due to deviations in the assembly and machining processes. A hole’s repair solution adopts the installation of titanium insert(s), avoiding the use of bigger fasteners. The fundamental requirement is to continue to guarantee high performances and efficiency of the jointed panels of the aircraft. Although this technique is diffused in metallic structures, its use is far from being completely understood in the case of composites (CFRP). In addition, differently from metals, the failure mechanisms of a composite joint are more complicated, since they vary with material properties, geometrical parameters and stress concentrations.For the above reasons, static tests are performed on different types of coupons and joints, manufactured from a carbon fiber/epoxy material and joined by countersunk fasteners. Coupons with nominal fasteners are taken as reference, while, in the remaining samples, selected holes are repaired using different inserting principles.All the tests are carried out until the final failure, in order to obtain results of the ultimate strength, especially related to the influence on the occurred failure mode(s). It is also highlighted that the assessment of the load transfer between the joint parts, and the stress distribution depend on the chosen inserting principle (countersunk/cylindrical and symmetrical/asymmetrical), on the size and on the location of repair inserts. Extensometers are used to measure relative displacements between the composite plates. Strain gauge measurements are performed on one family of coupons, in order to analyze the strain distribution in the area nearest to the hole in case of insert installed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Composite Structures Elsevier

The effect of titanium insert repairs on the static strength of CFRP coupons and joints

Loading next page...
 
/lp/elsevier/the-effect-of-titanium-insert-repairs-on-the-static-strength-of-cfrp-uEEdI3eDHD
Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier Ltd
ISSN
0263-8223
eISSN
1879-1085
D.O.I.
10.1016/j.compstruct.2015.08.042
Publisher site
See Article on Publisher Site

Abstract

In engineering industry, the panels manufacturing implicates the risk of having defects or damages due to deviations in the assembly and machining processes. A hole’s repair solution adopts the installation of titanium insert(s), avoiding the use of bigger fasteners. The fundamental requirement is to continue to guarantee high performances and efficiency of the jointed panels of the aircraft. Although this technique is diffused in metallic structures, its use is far from being completely understood in the case of composites (CFRP). In addition, differently from metals, the failure mechanisms of a composite joint are more complicated, since they vary with material properties, geometrical parameters and stress concentrations.For the above reasons, static tests are performed on different types of coupons and joints, manufactured from a carbon fiber/epoxy material and joined by countersunk fasteners. Coupons with nominal fasteners are taken as reference, while, in the remaining samples, selected holes are repaired using different inserting principles.All the tests are carried out until the final failure, in order to obtain results of the ultimate strength, especially related to the influence on the occurred failure mode(s). It is also highlighted that the assessment of the load transfer between the joint parts, and the stress distribution depend on the chosen inserting principle (countersunk/cylindrical and symmetrical/asymmetrical), on the size and on the location of repair inserts. Extensometers are used to measure relative displacements between the composite plates. Strain gauge measurements are performed on one family of coupons, in order to analyze the strain distribution in the area nearest to the hole in case of insert installed.

Journal

Composite StructuresElsevier

Published: Dec 15, 2015

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches

$49/month

Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.

$588

$360/year

billed annually
Start Free Trial

14-day Free Trial