A key aspect in the successful development of advanced high-performance materials and structures is to ensure their integrity and operational health status. To this end, advanced Non-Destructive Testing (NDT) and Structural Health Monitoring (SHM) techniques have been under development. Among the various techniques, those which identify a defect based on its vibro-acoustic signature have shown great success. The initiation or growth of a defect may be passively detected from the energy released from it in the form of elastic/acoustic waves, so-called Acoustic Emission. Furthermore, a defect may be actively detected and characterized based on its linear/nonlinear interaction with elastic/acoustic waves injected into the product.
Despite the promising performance of vibro-acoustic NDT and SHM techniques, their performance is highly dependent on:
• Efficient excitation and delivery of wave’s energy from actuation point into the defect region
• Efficient transmission of wave’s energy from the defect to the measurement point(s)
• Reliable realization of the generally weak deviations of response induced by the defect from the disturbing background noises
• Localization and characterization of a defect from a wave field distorted by diffraction and boundary reflections.
Acoustic Metamaterials (AMs) are artificially engineered materials which exhibit extraordinary wave manipulation characteristics e.g. frequency stop bands and negative refraction index, which has made them an ideal candidate for addressing these challenges. AMs may be utilized as parts of the inspection system for enhanced performance, or may be integrated into the product’s design for enabling advanced NDT and SHM techniques.
This Research Topic invites Original Research papers and Reviews from researchers around the world on the recent advances in the design and application of Acoustic Metamaterials for shaping the NDT and SHM techniques of the future, including but not limited to the following areas:
• Designing high-performance actuators and transducers with built-in noise cancellation, wave amplification and purification functionalities.
• Designing smart materials with built-in vibro-acoustic functionalities e.g. wave mode selection, beam forming and steering.
• Designing energy harvesters for maximized signal-to-noise ratio at reception and/or powering autonomous SHM systems.
• Development of specialized AM-based methodologies for inspection of defect clusters, materials and structures with (quasi-)periodic configuration.
• Capturing evanescent wave modes and enabling sub-wavelength defect reconstruction beyond diffraction limit.
• Design optimization of AMs for tunable broadband functionality.
Keywords:
Acoustic Metamaterials, Non-Destructive Testing, Structural Health Monitoring, NDT, SHM, Vibration, Wave Propagation
Important Note:
All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.
A key aspect in the successful development of advanced high-performance materials and structures is to ensure their integrity and operational health status. To this end, advanced Non-Destructive Testing (NDT) and Structural Health Monitoring (SHM) techniques have been under development. Among the various techniques, those which identify a defect based on its vibro-acoustic signature have shown great success. The initiation or growth of a defect may be passively detected from the energy released from it in the form of elastic/acoustic waves, so-called Acoustic Emission. Furthermore, a defect may be actively detected and characterized based on its linear/nonlinear interaction with elastic/acoustic waves injected into the product.
Despite the promising performance of vibro-acoustic NDT and SHM techniques, their performance is highly dependent on:
• Efficient excitation and delivery of wave’s energy from actuation point into the defect region
• Efficient transmission of wave’s energy from the defect to the measurement point(s)
• Reliable realization of the generally weak deviations of response induced by the defect from the disturbing background noises
• Localization and characterization of a defect from a wave field distorted by diffraction and boundary reflections.
Acoustic Metamaterials (AMs) are artificially engineered materials which exhibit extraordinary wave manipulation characteristics e.g. frequency stop bands and negative refraction index, which has made them an ideal candidate for addressing these challenges. AMs may be utilized as parts of the inspection system for enhanced performance, or may be integrated into the product’s design for enabling advanced NDT and SHM techniques.
This Research Topic invites Original Research papers and Reviews from researchers around the world on the recent advances in the design and application of Acoustic Metamaterials for shaping the NDT and SHM techniques of the future, including but not limited to the following areas:
• Designing high-performance actuators and transducers with built-in noise cancellation, wave amplification and purification functionalities.
• Designing smart materials with built-in vibro-acoustic functionalities e.g. wave mode selection, beam forming and steering.
• Designing energy harvesters for maximized signal-to-noise ratio at reception and/or powering autonomous SHM systems.
• Development of specialized AM-based methodologies for inspection of defect clusters, materials and structures with (quasi-)periodic configuration.
• Capturing evanescent wave modes and enabling sub-wavelength defect reconstruction beyond diffraction limit.
• Design optimization of AMs for tunable broadband functionality.
Keywords:
Acoustic Metamaterials, Non-Destructive Testing, Structural Health Monitoring, NDT, SHM, Vibration, Wave Propagation
Important Note:
All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.