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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
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Método multimodal de microscopía óptica para la detección de defectos en arreglos de topes de indio basado en la

Yifei Li1, Ziyi Wang1, Yong Li2,3

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Este estudio presenta un nuevo método para detectar defectos en arreglos de planos focales infrarrojos (IRFPA) mediante el análisis de campos de deformación. La técnica mejora la precisión y reduce los falsos positivos en la imagen microscópica para la inspección industrial.

Palabras clave:
diferencia de campo de deformación de Demonsdetección de defectosarreglo de plano focal infrarrojomicroscopía óptica

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Área de la Ciencia:

  • Ciencia e Ingeniería de Materiales; Ingeniería Óptica; Fabricación de Semiconductores

Sus antecedentes:

  • La detección de defectos en topes de indio en arreglos de planos focales infrarrojos (IRFPA) enfrenta desafíos con baja precisión y altos falsos positivos.
  • Las deformaciones sutiles, las distorsiones de imagen y las variaciones de escala en las imágenes microscópicas complican la identificación fiable de defectos.

Objetivo del estudio:

  • Desarrollar un método robusto de detección de defectos para IRFPA que aborde las limitaciones de las técnicas actuales.
  • Mejorar la precisión y reducir los falsos positivos en la identificación de defectos sutiles en imágenes microscópicas.

Principales métodos:

  • Se propuso un método de detección de defectos que utiliza la diferencia del campo de deformación de Demons multiescala.
  • Se implementó un flujo de trabajo que incluye registro global grueso, optimización del campo de deformación local y segmentación adaptativa de defectos.
  • Se empleó un modelo de Demons regularizado por Variación Total Bilateral (BTV) multiescala para el cálculo jerárquico del campo de deformación.

Principales resultados:

  • El método propuesto demostró una mayor robustez frente a la deformación, el ruido y las variaciones de escala en comparación con los algoritmos convencionales de coincidencia de plantillas.
  • El enfoque suprimió eficazmente las distorsiones inducidas por el ruido y al mismo tiempo preservó las transiciones críticas de la señal de defecto.
  • Se mejoró la prominencia de las señales de defecto locales para una identificación precisa.

Conclusiones:

  • El método de diferencia del campo de deformación de Demons multiescala ofrece un avance significativo en la detección de defectos de IRFPA.
  • La técnica cumple con los requisitos de inspección industrial, proporcionando un marco para la extracción de características débiles y la identificación precisa de defectos.
  • Aplicable en diversas modalidades de microscopía, incluyendo microscopía confocal de campo amplio, de campo claro y de campo oscuro.