New non-destructive testing techniques based on mechanical waves: development and application to damage characterization on non-homogeneus materials

• Autores: Vicente Genovés
• Directores de la Tesis: Jordi Payá Bernabeu (dir. tes.), Jorge Gosálbez Castillo (dir. tes.)
• Lectura: En la Universitat Politècnica de València ( España ) en 2018
• Idioma: español
• Tribunal Calificador de la Tesis: Tomás Enrique Gómez Álvarez-Arenas (presid.), Manuel Luis Romero García (secret.), Cédric Payan (voc.)
• Programa de doctorado: Programa de Doctorado en Ingeniería de la Construcción por la Universitat Politècnica de València
• Materias:
  • Física
    • Acústica
      • Propiedades acústicas de los sólidos
  • Ciencias tecnológicas
    • Tecnología de la construcción
      • Tecnología del hormigón
• Enlaces
  • Tesis en acceso abierto en: RiuNet
• Resumen

  • This doctoral thesis is developed in materials, Non-Destructive Testing (NDT) and signal processing fields. Its purpose is to make a contribution in new non destructive techniques focusing in its development and application to real systems.

    Durability and damage evaluation in non-homogeneous materials is the keystone of this document, assembling the structure in two main chapters. In the first instance the behaviour of Glass-fiber Reinforced Cement under bending test is evaluated. Multiple ultrasonic signals during the deformation process of the specimens were acquired, implementing a new multi-frequency acquisition technique.

    After the acquisition stage, linear and non-linear parameters were calculated from the pulsed ultrasonic signals correlating those parameters with the stress strain curve described during the test. In the third chapter, the impact spectroscopy analysis applied to chemical and thermal damaged mortar samples is exposed.

    The non-linear histeretic behaviour of the mortar specimens was studied more in depth. The analysis of the dynamic modulus softening with increment of the excitation amplitude is a hot spot at this moment for damage evaluation, being the current technique depending on the multiple signals acquisition. In this context, a new technique is proposed which allows a non-linear parameters extraction from a single reverberation signal.