The measurement of damage initiation, particle adhesion and cohesive strength from traction displacement curves of a nano-toughened epoxy

Published Date
October 2016, Vol.70:62–73, doi:10.1016/j.ijadhadh.2016.04.014

Author 

D. Mc Auliffe ^a

A. Karac ^b

N. Murphy ^a

A. Ivankovic ^a,

aSchool of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland

• bMasinski fakultet u Zenici, Fakultetska 1, 72000 Zenica, Bosnia and Herzegovina

Accepted 26 April 2016. Available online 17 May 2016. 

Abstract

In this work the deformation behaviour of a nano-toughened epoxy adhesive is measured at different levels of stress triaxiality. The test method consists of a notched axisymmetric adhesive layer loaded in tension. The recorded traction displacement curves were analysed numerically and it was found that the measured peak stress corresponds to the intrinsic cohesive strength, σ_max of the material. This method allows experimental measurement of σ_max for use in cohesive zone models of fracture. Additional features of the traction displacement curves include a kink that corresponds to particle debonding at a critical hydrostatic stress. By application of the Mori–Tanaka model, the relationship between the experimental measurements and particle/matrix adhesion is described.

Keywords

Nano-particles

Adhesive joints

Toughening mechanisms

Cohesive strength

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• ⁎ 
  Corresponding author.
  
  

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