Strain Measurement in Aluminium Alloy during the Solidification Process Using Embedded Fibre Bragg Gratings.
In recent years, the observation of the behaviour of components during the production process and over their life cycle is of increasing importance. Structural health monitoring, for example of carbon composites, is state-of-the-art research. The usage of Fibre Bragg Gratings (FBGs) in this field is of major advantage. Another possible area of application is in foundries. The internal state of melts during the solidification process is of particular interest. By using embedded FBGs, temperature and stress can be monitored during the process. In this work, FBGs were embedded in aluminium alloys in order to observe the occurring strain. Two different FBG positions were chosen in the mould in order to compare its dependence. It was shown that FBGs can withstand the solidification process, although a compression in the range of one percent was measured, which is in agreement with the literature value. Furthermore, different lengths of the gratings were applied, and it was shown that shorter gratings result in more accurate measurements. The obtained results prove that FBGs are applicable as sensors for temperatures up to 740 °C.
Institute for Measurement Systems and Sensor Technology, Technical University of Munich, 80333 Munich, Germany. k.weraneck@tum.de.
Klaus
K
Weraneck
Chair of Metal Forming and Casting, Technical University of Munich, 85748 Garching, Germany. florian.heilmeier@tum.de.
Florian
F
Heilmeier
Photonics Laboratory, Munich University of Applied Sciences, 80335 Munich, Germany. markus.lindner@hm.edu.
Markus
M
Lindner
Institute for Measurement Systems and Sensor Technology, Technical University of Munich, 80333 Munich, Germany. m.graf@tum.de.
Moritz
M
Graf
Institute for Measurement Systems and Sensor Technology, Technical University of Munich, 80333 Munich, Germany. m.jakobi@tum.de.
Martin
M
Jakobi
Chair of Metal Forming and Casting, Technical University of Munich, 85748 Garching, Germany. wolfram.volk@utg.de.
Wolfram
W
Volk
Photonics Laboratory, Munich University of Applied Sciences, 80335 Munich, Germany. roths@hm.edu.
Johannes
J
Roths
Institute for Measurement Systems and Sensor Technology, Technical University of Munich, 80333 Munich, Germany. a.w.koch@tum.de.
Alexander W
AW
Koch
aluminium alloy; fibre bragg grating; solidification process