{"id":{"repo_id":"unm","oai_identifier":"oai:digitalrepository.unm.edu:ce_etds-1051"},"canonical_url":"https://search.dev.ndltd.org/etd/unm/oai:digitalrepository.unm.edu:ce_etds-1051","repository":{"repo_id":"unm","name":"University of New Mexico","base_url":"https://digitalrepository.unm.edu/do/oai/"},"display":{"title":"Acoustic bandgap sensors for hot-spot damage monitoring","abstract":"This research presents a novel, mechanically tunable sensor that utilizes the acoustic response of a polymer based acoustic bandgap (ABG) material to identify and quantify damage in material substrates. Acoustic bandgap (ABG) sensors are the mechanical analogues of semi-conductors by which a periodic array of differing acoustic impedances causes an acoustic bandgap. This is comparable to the periodic array of electronic potentials that cause an electronic bandgap in semi-conductors. An ABG sensor is composed of a host matrix material with a periodic array of inclusions/scatterers made of a material with dissimilar acoustic impedance. ABG sensors offer advantages to structural health monitoring (SHM) applications. Such advantages include sensor scalability which enables macro to sub-micron damage detection and the non-intrusive attachment of the sensor to substrates. The specific use of ABG sensors is proposed for areas of known damage already initiated (hot-spots) in critical components of a structure. This thesis examines the proposed use of ABG materials as sensors by showing experimentally and analytically how ABG can be used to detect and quantify change in the strain field of the substrate underneath. A parametric experimental study examines specimens composed of two host materials of low and medium elasticity, one viscoelastic and one elastic respectively. Four volume fractions are also considered for both host material types. A finite element simulation is employed to verify the experimental observations of the acoustic bandgap sensors and to demonstrate the functionality of the sensor.","abstract_html":"This research presents a novel, mechanically tunable sensor that utilizes the acoustic response of a polymer based acoustic bandgap (ABG) material to identify and quantify damage in material substrates. Acoustic bandgap (ABG) sensors are the mechanical analogues of semi-conductors by which a periodic array of differing acoustic impedances causes an acoustic bandgap. This is comparable to the periodic array of electronic potentials that cause an electronic bandgap in semi-conductors. An ABG sensor is composed of a host matrix material with a periodic array of inclusions/scatterers made of a material with dissimilar acoustic impedance. ABG sensors offer advantages to structural health monitoring (SHM) applications. Such advantages include sensor scalability which enables macro to sub-micron damage detection and the non-intrusive attachment of the sensor to substrates. The specific use of ABG sensors is proposed for areas of known damage already initiated (hot-spots) in critical components of a structure. This thesis examines the proposed use of ABG materials as sensors by showing experimentally and analytically how ABG can be used to detect and quantify change in the strain field of the substrate underneath. A parametric experimental study examines specimens composed of two host materials of low and medium elasticity, one viscoelastic and one elastic respectively. Four volume fractions are also considered for both host material types. A finite element simulation is employed to verify the experimental observations of the acoustic bandgap sensors and to demonstrate the functionality of the sensor.","abstract_has_math":false,"creators":["Schnalzer, Ryan"],"institution":null,"degree_name":"Civil Engineering","degree_level":"Thesis","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Taha, Mahmoud","Walter, Gerstle","Timothy, Ross"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-08-30T07:00:00Z","date_published":"2011-08-30T07:00:00Z","updated_at":"2026-07-24T05:26:55Z","subjects":["Structural health monitoring","Detectors."],"languages":["English"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalrepository.unm.edu/ce_etds/50"],"render_values":[{"text":"https://digitalrepository.unm.edu/ce_etds/50","href":"https://digitalrepository.unm.edu/ce_etds/50","code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/1928/13109","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Taha, Mahmoud","Walter, Gerstle","Timothy, Ross"]},{"key":"dc:creator","label":"Author","values":["Schnalzer, Ryan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis","Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Civil Engineering"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Structural health monitoring","Detectors."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/1928/13109","https://digitalrepository.unm.edu/ce_etds/50"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This research presents a novel, mechanically tunable sensor that utilizes the acoustic response of a polymer based acoustic bandgap (ABG) material to identify and quantify damage in material substrates. Acoustic bandgap (ABG) sensors are the mechanical analogues of semi-conductors by which a periodic array of differing acoustic impedances causes an acoustic bandgap. This is comparable to the periodic array of electronic potentials that cause an electronic bandgap in semi-conductors. An ABG sensor is composed of a host matrix material with a periodic array of inclusions/scatterers made of a material with dissimilar acoustic impedance. ABG sensors offer advantages to structural health monitoring (SHM) applications. Such advantages include sensor scalability which enables macro to sub-micron damage detection and the non-intrusive attachment of the sensor to substrates. The specific use of ABG sensors is proposed for areas of known damage already initiated (hot-spots) in critical components of a structure. This thesis examines the proposed use of ABG materials as sensors by showing experimentally and analytically how ABG can be used to detect and quantify change in the strain field of the substrate underneath. A parametric experimental study examines specimens composed of two host materials of low and medium elasticity, one viscoelastic and one elastic respectively. Four volume fractions are also considered for both host material types. A finite element simulation is employed to verify the experimental observations of the acoustic bandgap sensors and to demonstrate the functionality of the sensor."]},{"key":"dc:title","label":"Title","values":["Acoustic bandgap sensors for hot-spot damage monitoring"]}]}],"canonical_facts":{"dc:contributor":["Taha, Mahmoud","Walter, Gerstle","Timothy, Ross"],"dc:creator":["Schnalzer, Ryan"],"dc:description.abstract":["This research presents a novel, mechanically tunable sensor that utilizes the acoustic response of a polymer based acoustic bandgap (ABG) material to identify and quantify damage in material substrates. Acoustic bandgap (ABG) sensors are the mechanical analogues of semi-conductors by which a periodic array of differing acoustic impedances causes an acoustic bandgap. This is comparable to the periodic array of electronic potentials that cause an electronic bandgap in semi-conductors. An ABG sensor is composed of a host matrix material with a periodic array of inclusions/scatterers made of a material with dissimilar acoustic impedance. ABG sensors offer advantages to structural health monitoring (SHM) applications. Such advantages include sensor scalability which enables macro to sub-micron damage detection and the non-intrusive attachment of the sensor to substrates. The specific use of ABG sensors is proposed for areas of known damage already initiated (hot-spots) in critical components of a structure. This thesis examines the proposed use of ABG materials as sensors by showing experimentally and analytically how ABG can be used to detect and quantify change in the strain field of the substrate underneath. A parametric experimental study examines specimens composed of two host materials of low and medium elasticity, one viscoelastic and one elastic respectively. Four volume fractions are also considered for both host material types. 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