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dc.contributor.advisorShafiq, Basir
dc.contributor.authorJover-Vega, Nannette
dc.description.abstractThis thesis achieves a reasonable advance in understanding how balsa core sandwich composites with thin carbon fiber skins behave under impact loads through the empirical analysis of single and multiple impacts. It was found that the ballistic limit for this material is 96 m•s-1. This indicates that it is capable of withstanding impacts from small projectiles at intermediate velocities (10-100 m•s-1 ), i.e., secondary debris from blast, hurricane and tornado debris, and foreign object debris on roads and runways. The work principally examined the role of balsa wood as a core material. The visual inspection and non-destructive evaluation (NDE) tests showed that the damage propagation is relatively localized and that impacts that span out more than an inch from one another have minimal effects on the structure’s impact resistance. Further research may match these results to develop computer or mathematical models to understand parameters such as the stresses in the facesheets and the deformations during the impact event.
dc.description.abstractEsta tesis se compone de un análisis empírico de impactos, individuales y múltiples, en compuesto de tipo sándwich con láminas de fibra de carbón y un centro de madera balsa. Principalmente se examinó el papel de la madera balsa como material de núcleo con el objetivo específico de adquirir conocimiento sobre los mecanismos y la propagación de daños. Se encontró que el límite balístico del material es 96 m•s-1, tal que puede resistir impactos de pequeños proyectiles a velocidades intermedias (10-100 m•s-1 ), es decir, fragmentos secundarios de explosión, escombros de huracán o tornado, y residuos en las carreteras y pistas de aterrizaje. Las evaluaciones no destructivas mostraron que la propagación de daños es relativamente localizada. Los resultados son un avance razonable en la comprensión de los mecanismos de daño en materiales compuestos tipo sándwich con centro de madera de balsa y puede servir como base para el desarrollo futuro de modelos analíticos o numéricos para dicho material.
dc.description.sponsorshipThe Office of Naval Research under grant N000141110101.en_US
dc.subjectSandwich compositeen_US
dc.subject.lcshSandwich constructionen_US
dc.subject.lcshComposite materialsen_US
dc.subject.lcshBalsa wooden_US
dc.titleBallistic impact analysis of balsa core sandwich compositesen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2013 Nannette Jover Vegaen_US
dc.contributor.committeeSuárez, Luis
dc.contributor.committeeLópez Rodriguez, Ricardo R.
dc.contributor.representativeSantos, Hernán Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Civil Engineeringen_US

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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a graduate degree at UPR-Mayagüez.

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