Prof. Mark Spearing, Pro Vice Chancellor, University of Southampton

High resolution tomography studies of composites: The data rich mechanics opportunity
When Apr 29, 2013
from 02:00 PM to 03:00 PM
Where LR8
Contact Name
Contact Phone 01865 283302
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High resolution X-ray tomography has been used to observe and quantify damage mechanisms in composite materials under load.  Using synchrotron and micro-focus X-ray sources resolutions of less than 2 µm have been routinely achieved.  This enables individual broken fibres to be observed and crack opening and shear displacements for delaminations and intra-laminar cracks to be measured.  Examples of the application of these techniques to transverse ply cracking, notch-tip splitting (see figure 1), delamination initiation and growth (see figure 2) and fibre fracture accumulation will be presented.  Quantitative data will be compared to model predictions.  The overall implications for using such high-resolution 3-D measurements to inform a “data-rich mechanics” approach to materials evaluation and modeling will be discussed.

Mark Spearing 
Fig. 1. An example of imaging with in situ loading of a split emanating from a notch tip (top left).  The left hand image is unloaded and the right hand loaded.




Mark SpearingFig. 2. A three-dimensional rendering of an early stage delamination, showing initial damage consisting of fibre-matrix debonding and subsequent coalescence