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Sensibilidad de la tasa dependiente de la gravedad en la intrusión granular: experimentos y simulaciones en

Meiying Hou1, Xiaohui Cheng2, Sen Yang3

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La gravedad impacta significativamente la intrusión de material granular. En microgravedad (0g), las fuerzas resistivas aumentan drásticamente con la velocidad, a diferencia de la gravedad normal (1g), debido a la fricción sensible a la presión.

Palabras clave:
microgravedadgravedadfuerzas de arrastreintrusión granularfricciónexploración planetariaingeniería geológica

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Área de la Ciencia:

  • Geofísica
  • Ciencia de Materiales
  • Dinámica de Fluidos

Sus antecedentes:

  • Comprender el comportamiento de los materiales granulares bajo gravedad variable es vital para la exploración planetaria y la ingeniería de terremotos submarinos.
  • Es crucial investigar el efecto de la gravedad en las fuerzas de arrastre durante la intrusión de objetos en medios granulares.

Objetivo del estudio:

  • Cuantificar experimentalmente la influencia de la gravedad en las fuerzas de arrastre resistivas experimentadas por un cilindro que se introduce en materiales granulares.
  • Comparar la dinámica de intrusión granular en gravedad normal (1g) y microgravedad (0g).

Principales métodos:

  • Los experimentos se realizaron en 1g y microgravedad (0g) utilizando la Torre de Caída de Beijing.
  • Se midieron las fuerzas resistivas sobre un cilindro que se movía a velocidad constante a través de un lecho granular.
  • Se emplearon simulaciones de elementos finitos lagrangianos acoplados (CEL) para respaldar los hallazgos experimentales.

Principales resultados:

  • Las fuerzas resistivas aumentaron significativamente con la velocidad del cilindro en microgravedad (0g).
  • En gravedad normal (1g), las fuerzas resistivas aumentaron mucho más lentamente con la velocidad del cilindro.
  • Las diferencias observadas se atribuyeron a que las fuerzas de fricción sensibles a la presión se volvieron dominantes en microgravedad.

Conclusiones:

  • La gravedad juega un papel importante en el comportamiento reológico de los materiales granulares durante la intrusión.
  • Los modelos constitutivos para el flujo granular en microgravedad deben diferir sustancialmente de los utilizados para condiciones de 1g.
  • Los hallazgos tienen implicaciones para la exploración extraterrestre y la evaluación de peligros geológicos submarinos.