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Grant number: 12/01047-8
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2012
Effective date (End): January 31, 2016
Field of knowledge:Engineering - Aerospace Engineering - Aerospace Structures
Principal researcher:Volnei Tita
Grantee:Ricardo de Medeiros
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


Structural health monitoring is an area of growing interest using innovative approaches. Other hand, the maintenance and repair tasks represent about one quarter of the operating costs of commercial aircraft. Therefore, SHM system installed in the structure not only provides greater airworthiness, but also maximizing the numbers of suitable inspection periods for airplanes. Thus, SHM system can replace the traditional maintenance plan, reducing the airplane operational costs and preventing needless maintenances. The SHM system should inform, all the time, during the structure life, a diagnostic of the material state as well as the structure condition, which should be in agreement with specified by the initial structural project. However, the material state and the structure condition modify in function of the time due to aging, environment effects and loadings in service. Based on the complete history occurred, the SHM system can also perform a prognostic of the structure, for example, a prediction of residual strength. Considering this scenario, the main objective of this work consists on developing residual strength criterion for composite structures damaged by impact loading. For the development of the criterion, it will be necessary: to identify and to localize damage, as well as to calculate the severity of the damage and to estimate the residual strength of the composite structure. To achieve these goals, it is used to research Methodology based on three main groups of activities: (1) Before Impact Test; (2) During Impact Test (real-time) and (3) After Impact Test. In the first group (Before Impact Test), consists of literature reviews related to mathematical model used for SHM systems, which use sensors/actuators piezoelectric. Then, theoretical dynamic analyses of composite structure will be carried out by program ABAQUS, aided by "macro" in Python language. Piezoelectric sensors/actuators are attached on suitable positions of intact composite plates. After that, experimental analyses (modal tests) will be performed in intact composite specimens with attached piezoelectric sensors/actuators. The consistency of the computational models is evaluated comparing numerical results with experimental results for intact structures. If the consistency is acceptable, then move into the second group of activities. In this group (During Impact Test), finite element analyses of composite structures under low velocity impact will be carried out, using program ABAQUS and UMAT and/or VUMAT subroutines in Fortran language. After that, composite plates with attached piezoelectric sensors/actuators will be impacted under low velocity. In the third group (After Impact), there will be a comparison between numerical and experimental results in order to verify the consistency of the computational models for damaged structures. Thus, a method to localize and to evaluate damage severity will be proposed, using experimental and numerical results from intact and damaged composite structures. Finally, the results provided by the proposed method will be used to evaluate the residual strength of damaged composite structures. This criterion consists on determining the 4-point bending maximum loading, which will be supported by damaged plate by impact test.

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Scientific publications (10)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE MEDEIROS, RICARDO; SARTORATO, MURILO; VANDEPITTE, DIRK; TITA, VOLNEI. A comparative assessment of different frequency based damage detection in unidirectional composite plates using MFC sensors. Journal of Sound and Vibration, v. 383, p. 171-190, . (12/01047-8, 10/13596-0)
FLOR, FELIPE RENDEIRO; DE MEDEIROS, RICARDO; TITA, VOLNEI. Numerical and Experimental Damage Identification in Metal-Composite Bonded Joint. JOURNAL OF ADHESION, v. 91, n. 10-11, SI, p. 863-882, . (12/01047-8, 12/03645-0)
BRITO-SANTANA, HUMBERTO; DE MEDEIROS, RICARDO; RODRIGUEZ-RAMOS, REINALDO; TITA, VOLNEI. Different interface models for calculating the effective properties in piezoelectric composite materials with imperfect fiber-matrix adhesion. COMPOSITE STRUCTURES, v. 151, p. 70-80, . (12/01047-8)
DE MEDEIROS, RICARDO; RODRIGUEZ-RAMOS, REINALDO; GUINOVART-DIAZ, RAUL; BRAVO-CASTILLERO, JULIAN; OTERO, JOSE A.; TITA, VOLNEI. Numerical and analytical analyses for active fiber composite piezoelectric composite materials. Journal of Intelligent Material Systems and Structures, v. 26, n. 1, p. 101-118, . (12/01047-8, 12/03645-0)
DE MENEZES, VANESSA G. S.; SOUZA, GABRIEL S. C.; VANDEPITTE, DIRK; TITA, VOLNEI; DE MEDEIROS, RICARDO. Defect and damage detection in filament wound carbon composite cylinders: A new numerical-experimental methodology based on vibrational analyses. COMPOSITE STRUCTURES, v. 276, . (19/15179-2, 15/15221-8, 12/01047-8)
TITA, VOLNEI; DE MEDEIROS, RICARDO; MARQUES, FLAVIO D.; MORENO, MARIANO E.. Effective properties evaluation for smart composite materials with imperfect fiber-matrix adhesion. JOURNAL OF COMPOSITE MATERIALS, v. 49, n. 29, p. 3683-3701, . (12/01047-8, 12/03645-0)
DOS SANTOS SOUZA, LUIZ FERNANDO; VANDEPITTE, DIRK; TITA, VOLNEI; DE MEDEIROS, RICARDO. Dynamic response of laminated composites using design of experiments: An experimental and numerical study. MECHANICAL SYSTEMS AND SIGNAL PROCESSING, v. 115, p. 82-101, . (15/15221-8, 12/01047-8)
SARTORATO, MURILO; DE MEDEIROS, RICARDO; TITA, VOLNEI. A finite element formulation for smart piezoelectric composite shells: Mathematical formulation, computational analysis and experimental evaluation. COMPOSITE STRUCTURES, v. 127, p. 185-198, . (12/01047-8, 10/13596-0)
DE MEDEIROS, RICARDO; VANDEPITTE, DIRK; TITA, VOLNEI. Structural health monitoring for impact damaged composite: a new methodology based on a combination of techniques. STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL, v. 17, n. 2, p. 185-200, . (15/15221-8, 12/01047-8)
DA COSTA, ROMEU R. C.; SATO, EDUARDO S.; RIBEIRO, MARCELO L.; DE MEDEIROS, RICARDO; VIEIRA, ANDRE F. C.; GUEDES, RUI M.; TITA, VOLNEI. Polyurethane derived from castor oil reinforced with long cotton fibers: Static and dynamic testing of a novel eco-friendly composite material. JOURNAL OF COMPOSITE MATERIALS, v. 54, n. 22, . (12/01047-8, 15/13844-8)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
MEDEIROS, Ricardo de. Development of a criterion for predicting residual strength of composite structures damaged by impact loading. 2016. Doctoral Thesis - Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) São Carlos.

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