Mechanics and Failure of Structured Interfaces

Publikation: Bog/antologi/afhandling/rapportPh.d.-afhandling

DOI

This dissertation concerns heterogeneous, structured interfaces’ mechanics
and failure, in particular the load response, critical fracture energy and
crack kinetics. During the project eight manuscripts have been prepared
and submitted to scientific journals. Five of these are included here forming
the main body of the dissertation. The topics of these include development
and test of a new nano-adhesive based on polymer brushes to
bond rubber and metal, a novel peel test specimen comprising a heterogeneous
geometry, consequences of zones of weak adhesion, bridging of
a support carrier in the bondline, and, macro- and micromechanical behavior
of pillar-structured interfaces. Analytical modeling and numerical
simulations backed up by experimental testing were used to study these,
among others.
The following results and conclusions are drawn from the project.

- The nano-adhesive offers similar adhesion strength and quality as
a common commercial binder-and-primer solution while having a
bondline three orders of magnitude thinner.

- An additional length scale parameter (the elastic process zone size)
have been introduced and its role in effective critical fracture energy
has been recognized.

- Introducing zones of weak adhesion reduces joint performance. However,
if a zone of strong adhesion at least the size of the elastic process
zone exists, the joint recovers it full strength. The effective critical
fracture energy can be calculated as the weighted sum of strong and
weak adhesion zones within the elastic process zone.

- Rate effects from loading rate and crack velocity play a vital role
when determining the energy release rate and might result in a conservative
critical fracture energy.

- Pillar structured interfaces enhance critical fracture load and damage
tolerance while slightly increasing the joint compliance.
OriginalsprogEngelsk
ForlagAarhus Universitet
Antal sider174
ISBN (Elektronisk)978-87-7507-458-7
DOI
StatusUdgivet - sep. 2019

    Forskningsområder

  • Interfacers, Fracture mechanics, Adhesive bond failure

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