team:gdeliege:shearo
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
team:gdeliege:shearo [2015/08/11 15:40] – geoffrey | team:gdeliege:shearo [2016/03/30 15:23] (current) – external edit 127.0.0.1 | ||
---|---|---|---|
Line 1: | Line 1: | ||
- | ==== 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. | ||
Line 28: | Line 28: | ||
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 (10cm*15cm) 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. |
In practice, one or several holes were drilled in the back of the plates to simulate defects. | In practice, one or several holes were drilled in the back of the plates to simulate defects. | ||
In the numerical models, two kinds of defects were considered: either one circular hole | In the numerical models, two kinds of defects were considered: either one circular hole | ||
Line 42: | Line 42: | ||
{{ : | {{ : | ||
- | //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. | ||
Line 49: | Line 49: | ||
One possibility is to use a time-varying heat source instead of a flash | One possibility is to use a time-varying heat source instead of a flash | ||
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, | ||
{{ : | {{ : | ||
- | //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.1439300418.txt.gz · Last modified: 2016/03/30 15:22 (external edit)