dc.contributor.author | Tu, Wei | |
dc.date.accessioned | 2012-02-29T17:06:33Z | |
dc.date.available | 2012-02-29T17:06:33Z | |
dc.date.issued | 2011 | |
dc.identifier.uri | http://qmro.qmul.ac.uk/xmlui/handle/123456789/2449 | |
dc.description | PhD | en_US |
dc.description.abstract | Current and future structural applications for composite laminates frequently involve
design solutions combining composite laminates and metal; the materials must be
joined. Two conventional means of joining are available: mechanical joining and
adhesive bonding. Both methods have critical disadvantages.
A novel surface treatment for metals developed at TWI, Surfi-Sculpt TM leads to the
formation of surface protrusions on metal surfaces. These protrusions are typically
1.0 mm high and 0.6 mm diameter. The surface modified metal can be bonded with
composite laminates to form a Comeld TM joint. These joints can be described as a
combination of mechanical fastening and adhesive bonding. There are many possible
variables which could be applied to the metal surface. The variables include the
shape, height, orientation and distribution (distribution pattern and density) of the
protrusions.
The aim of this work was to optimise the protrusions with respect to their geometry
and distribution using the finite element modelling method for the Comeld TM joint
under tensile loading with titanium alloy and cross-ply carbon prepreg composites.
The simulations require multi-scale modelling techniques to transfer results between
the global model, which is the reflection of the whole joint, and the unit cell models
containing a protrusion. The two-dimensional simulations focused on the protrusion
geometric parameters whereas the three-dimensional simulations focused on the
protrusion spatial arrangement including the distribution pattern and density.
Modelling of the entire joint geometry with two and three-dimensional global models
was carried out using smeared properties for the adhesive layer which includes the
protrusions.
These models yield results for both quasi-static properties and stress distributions for
these joints. Results from the simulations show critical effects on stress distributions
arising from changing protrusion geometry. These joints show significant advantages
over conventional joining technologies and their application would allow improved
performance for combinations of metal and composite laminates. | en_US |
dc.language.iso | en | en_US |
dc.publisher | Queen Mary University of London | |
dc.subject | Geography | en_US |
dc.title | Comeld TM joints: optimisation of geometric parameters of the protrusions. | en_US |
dc.type | Thesis | en_US |
dc.rights.holder | The copyright of this thesis rests with the author and no quotation from it or information derived from it may be published without the prior written consent of the author | |