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--- team:gdeliege:shearo [2015/08/12 14:26] – 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 no expert in shearography, so I will quote J.-F. Vandenrijt [1] for a proper definition:
+I am no shearography expert, so I will quote J.-F. Vandenrijt [1] for a proper definition:
 //Shearography records the interference pattern between a speckle object wavefront
 and itself laterally displaced through an optical shearing device.
@@ Line 28: / Line 28: @@
 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.
-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 results,
-so I made simulations on my own with my own code.
+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.
@@ Line 42: / Line 42: @@
 {{ :team:gdeliege:sheaor01.png?direct |}}
-//Figure 1. Results obtained with my own code, visualized with [[http://www.geuz.org/gmsh|Gmsh]]: (1) geometry of the plate with a circular hole, (2) vertical displacement of the upper face, (3) derivative  of the vertical displacement, (4) shearogram.//
+//Figure 1. Results obtained with my own code (mesh and visualization with [[http://www.geuz.org/gmsh|Gmsh]]) : (1) geometry of the plate with a circular hole, (2) vertical displacement of the upper face, (3) derivative  of the vertical displacement, (4) shearogram.//
 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 55: / Line 55: @@
 //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 function of time: (left) shallow insert (1mm), excitation 1Hz; (center) deep insert (3mm), excitation 1Hz; (right) deep insert (3mm), excitation 0.1Hz.//
-== References ==
+=== References ===
 [1] [[http://orbi.ulg.ac.be//handle/2268/169198|J.-F. Vandenrijt, N. Lièvre, M. Georges. Improvement of defect detection in shearography by using Principal Component Analysis. Proceedings of Conference on Interferometry XVII: Techniques and Analysis, 2014]] \\
 [2] G. Crabus. //Contrôle non-destructif par shearographie : développements expérimentaux de méthodes de stimulation thermique.// 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:gdeliege|Back to main page]]