team:gdeliege:shearo
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team:gdeliege:shearo [2015/08/11 15:53] – geoffrey | team:gdeliege:shearo [2015/08/13 17:15] – geoffrey | ||
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- | ==== Shearography ==== | + | ===== Shearography |
- | == Introduction == | + | === Introduction |
- | I am really | + | I am no shearography |
// | // | ||
and itself laterally displaced through an optical shearing device. | and itself laterally displaced through an optical shearing device. | ||
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and Arthur Lismonde [3] made finite element simulations of the experiment. | and Arthur Lismonde [3] made finite element simulations of the experiment. | ||
Arthur used ANSYS, which was available at the university where he went on Erasmus. | Arthur used ANSYS, which was available at the university where he went on Erasmus. | ||
- | However, we wanted to make a test requiring a particular post-processing of the results, | + | However, we wanted to make a test requiring a particular post-processing of the finite element |
- | so I made simulations on my own with my personal | + | so I made simulations on my own with my code. |
- | == Problem description == | + | === Problem description |
Several composite plates (18cm*15cm*4.4mm) were made of epoxy resin reinforced with carbon fabric. | Several composite plates (18cm*15cm*4.4mm) were made of epoxy resin reinforced with carbon fabric. | ||
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{{ : | {{ : | ||
- | //Figure 1. Results obtained with my personal | + | //Figure 1. Results obtained with my own code (mesh and visualization |
One can see in Fig. 1 the finite element results obtained when the plate is heated up with a flash, which is represented by a constant heat flux applied for a few microseconds. | One can see in Fig. 1 the finite element results obtained when the plate is heated up with a flash, which is represented by a constant heat flux applied for a few microseconds. | ||
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and to apply a Fourier transform to the sequence of shearograms that are recorded over a period of time. | and to apply a Fourier transform to the sequence of shearograms that are recorded over a period of time. | ||
- | I made simulations with Teflon inserts at different positions, either close to the surface (1 mm) or deeper in the laminate (3 mm). I applied a sinusoidal heat flux at different frequencies, | + | I made simulations with Teflon inserts at different positions, either close to the surface (1 mm) or deeper in the laminate (3 mm). I applied a sinusoidal heat flux at different frequencies, |
{{ : | {{ : | ||
- | //Figure 2. Phase offset of the Fourier transform of shearograms obtained with my personal | + | //Figure 2. Phase offset of the Fourier transform of shearograms obtained with my own code. The defect is a Teflon insert and the heat flux is a sinusoidal |
- | == References == | + | === References |
[1] [[http:// | [1] [[http:// | ||
[2] G. Crabus. //Contrôle non-destructif par shearographie : développements expérimentaux de méthodes de stimulation thermique.// | [2] G. Crabus. //Contrôle non-destructif par shearographie : développements expérimentaux de méthodes de stimulation thermique.// | ||
[3] A. Lismonde. //Contrôle non-destructif par shearographie : simulations thermomécaniques de composites à renforts tissés.// Master thesis, Université de Liège, 2014 \\ | [3] A. Lismonde. //Contrôle non-destructif par shearographie : simulations thermomécaniques de composites à renforts tissés.// Master thesis, Université de Liège, 2014 \\ | ||
+ | \\ | ||
+ | [[team: | ||
team/gdeliege/shearo.txt · Last modified: 2016/03/30 15:23 by 127.0.0.1