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A minimal model to understand the discrepancies between acoustic and electromagnetic emissions in fracturing processes

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Clavijo Ramírez, Jorge Enrique
Salas, Yecid
Sánchez, Sandra Esperanza
Abstract (Spanish)
A pesar de su origen común, los experimentos demuestran que las emisiones acústicas y electromagnéticas evolucionan de forma diferente durante los procesos de fractura de materiales frágiles. Es frecuente encontrar picos de actividad acústica sin presencia de emisiones electromagnéticas y viceversa, es posible encontrar una elevada radiación electromagnética sin actividad acústica significativa. Hasta donde sabemos, actualmente no existen modelos que expliquen estas discrepancias de forma sencilla. En este trabajo proponemos un modelo mínimo que es capaz de generar las discrepancias frecuentemente observadas entre las emisiones acústicas y electromagnéticas durante los procesos de fractura de materiales frágiles. El modelo es una versión eléctrica del modelo de haces de fibras en el que las fibras se sustituyen por fusibles en una resistencia. Las resistencias se colocan en un puente de Wheatstone sometido a una tensión que aumenta gradualmente. Se añade un condensador para generar procesos de carga y descarga que generarán las emisiones electromagnéticas, mientras que la rotura de los fusibles generará las emisiones acústicas. El modelo permite seguir la evolución de las actividades acústica y electromagnética y muestra que, a pesar de su origen común, los dos fenómenos evolucionan de forma diferente.
Abstract (English)
Despite their common origin, experiments show that acoustic and electromagnetic emissions evolve in different ways during the fracture processes of brittle materials. It is common to find peaks of acoustic activity without the presence of electromagnetic emissions and vice versa, it is possible to find high electromagnetic radiation without significant acoustic activity. As far as we know, there are currently no models that explain these discrepancies in a simple way. In this work we propose a minimal model that is able to generate the frequently observed discrepancies between acoustic and electromagnetic emissions during fracture processes of brittle materials. The model is an electrical version of the fiber bundle model where the fibers are replaced by fuses in a resistor. The resistors are placed on a Wheatstone bridge subjected to a gradually increasing voltage. A capacitor is added to generate charge and discharge processes that will generate the electromagnetic emissions, while the breaking of the fuses will generate the acoustic emissions. The model allows to follow the evolution of acoustic and electromagnetic activities and shows that, despite their common origin, the two phenomena evolve differently.
Extent
5 páginas
URI: https://repositorio.escuelaing.edu.co/handle/001/2398
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AM - Grupo de Investigación en Estructuras y Materiales
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