Usage de la 3DExperience appliqué à la recherche et à la pédagogie

Study of plagioclase crystals
in a synthetic basalt. 3DEXPERIENCE applied to
research and education LaSalle Beauvais is an engineering school with a department dedicated to geology. During their studies,
students are required to carry out a research thesis. This year, two groups of third-year students worked on the in-situ observation of volcanic rock. Students Anne, Emeric, Clement
and Valentine resumed the research I have been
conducting for 12 years and which began at the Petrographic
and Geochemical Research Center in Nancy. Synthetic samples were created from an oxide powder whose composition
is that of basalt. The experiments were designed to correlate the thermal history of this rock
with its textures. In 2008 samples were x-rayed at Spring 8 synchrotron in Japan
at a scientific program for the Japanese Society for
the Promotion of Science. The results obtained from
the micro X-ray tomography allow us to see pictures from inside
the rock without being destructive. Therefore, we have more than 300 shots for samples whose diameter
is less than 2mm. Since 2011, students from LaSalle Beauvais
have succeeded in analyzing images of this basalt. This analysis is very difficult because of the large number of crystals
and their connectivity. The previous software did not enable us
to obtain these measurements or satisfactory results. 4. In 2014, we launched a dissertation
aimed to recreate a 3D model using these sample
successive images. The aim is to measure
the dimensions of the crystals as well as view
the texture of this basalt. Dassault Systèmes collaborated with the geology department of LaSalle Beauvais on not only a scientific level
but also academically. The main goal was to make
teaching more progressive and to implement new scientific methods to enable researchers to draw more precise conclusions from observations. One of the strengths of the 3DEXPERIENCE
is the ability to work simultaneously
and remotely on the same 3D model. It manages a large amount of heterogeneous data
for the same project. The 3DEXPERIENCE brought us
the ability to design and perform measurements
manually on all of the crystals. This allowed us to critically
examine their form and possibly change their morphology
according to our own judgment. With this freedom of manipulation, we could easily test different
design strategies. At first, we considered
the different possibilities of transforming our two-dimensional images into one three-dimensional model. To do so,
we participated in several meetings with former teachers
and Dassault Systèmes. We had the delicate task of interpreting the position of the plagioclase crystals in the space. With the 3DEXPERIENCE we can
create volumes in 3 dimensions as we like, and also test and modify
different modeling strategies. This solution allows you to manage a large
amount of heterogeneous data in one project and work in real time with different
actors and in remote locations. Once the model is realized, it is particularly interesting to exploit and obtain data directly
with the 3DEXPERIENCE. We also modeled in 3 dimensions
a scale 100 replica of the volcanic rock with the plagioclase represented in white and the connectors in black. Once the ball is modeled, it becomes possible to observe
direct relations between crystals both on the numerical model and also the physical model
using 3D printing. In addition, the software can make in-situ measurements of the crystals and these individual results
show that the observed crystals have a tabular form as
described in the literature. The crystals’ measurements can be compared to that obtained in the 2D tracking mathematical
correction observation. With this information, we were able to
compare the size distributions of the crystals and demonstrate that the
corrective methods were quite close to reality. The scientific results provided by
this study will not only help in better understanding the practical relations and
properties of magmas but also the evolution of
crystal growth in the magma. The contribution of the 3DEXPERIENCE
will allow students to directly visualize some of
the parameters that were previously only
discussed theoretically.

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