Accession Number:

ADA470720

Title:

Enhancing the Interfacial and Dynamic Failure Behavior of Advanced Hybrid Structures Using Nanocomposite Materials

Descriptive Note:

Final rept. 1 Jun 2003-31 May 2007

Corporate Author:

VANDERBILT UNIV NASHVILLE TN DIV OF SPONSORED RESEARCH

Personal Author(s):

Report Date:

2007-08-08

Pagination or Media Count:

16.0

Abstract:

A novel interfacial joint was developed for reducing the interfacial stress levels. The proposed design, inspired by the shape and mechanics of trees, effectively removed the stress singularity at the interfacial joint for most engineering materials through an integrated theoretical and experimental investigation. Significant tensile loading capacity increase was obtained up to 81 using this new joint, while the material volume of the new joint actually was reduced. Dynamic tension experiments showed that the new convex joint yielded an increase in final failure strength 22. This new joint can be employed to accurately evaluate the interfacial strength improvement of dissimilar material joints. Nanofiber-reinforced epoxy bonding with linker molecules was synthesized and tested for metalmetal and polymerpolymer joints. Mechanical properties including tension and shear bonding strengths showed very low increase or even decrease of nanocomposite bonding over that of pure epoxy bonding.

Subject Categories:

  • Electrical and Electronic Equipment
  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE