Identification of Interparticle Contacts in Granular Media Using Mechanoluminescent Material
Mechanoluminescent powders are new materials that can be considered as intelligent, active or responsive because they have the property of emitting light when they are mechanically deformed. They open perspectives for the measurement of stresses in mechanical parts. The present study focused on the stress concentrations in granular materials. Granular systems are defined as a collection of particles whose macroscopic behavior depends on the contact forces at the local scale. Some techniques are available for measurements in the bulk, such as X-ray tomography combined with volumetric digital image correlation. An extensive literature also deals with two-dimensional approaches: optical photography combined with digital image correlation, photoelasticimetry, infrared thermography. Mechanoluminescent materials offer new possibilities for revealing contact force networks in granular materials. Epoxy resin and mechanoluminescent powder were mixed to prepare dumbbell-like specimens and cylinders. Dumbbell-like specimens were used for preliminary uniaxial tensile tests. Cylinders were used to prepare granular systems for confined compression tests. Homogeneous light emission was obtained in the former case, while light concentrations were evidenced in the latter case.
KeywordsMechanoluminescence Luminescence Granular material Interparticle contact
The authors gratefully acknowledge the Ministère de l’Europe et des Affaires Etrangères (MEAE) and the Ministère de l’Enseignement supérieur, de la Recherche et de l’Innovation (MESRI) in France, as well as the Office of the Higher Education Commission (OHEC) of the Ministry of Education in Thailand. The authors also gratefully thank the French Embassy in Thailand and Campus France for their support during this research (PHC SIAM 2018, Project 40710SE). The authors would also like to acknowledge the financial support through the Research Grant for New Scholar (MRG6080251) from the Thailand Research Fund (TRF) and Thailand’s Office of the Higher Education Commission (OHEC). Finally, the authors gratefully thank Mr. Maël Tissier, Sigma-Clermont Engineering School, for the elaboration of mechanoluminescent materials, as well as Mr. Clément Weigel and Mr. Alexis Gravier, Sigma-Clermont Engineering School, for the manufacturing of the testing device and the molds.
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