STRUCTURAL HEALTH MONITORING OF SANDWICH STRUCTURES BASED ON DYNAMIC ANALYSIS

Authors

  • DENYS MARQUES DEPARTMENT OF AERONAUTICAL ENGINEERING, SÃO CARLOS SCHOOL OF ENGINEERING, UNIVERSITY OF SÃO PAULO, AV. JOÃO DAGNONE, 1100, 13573-120, SÃO CARLOS, SP, BRAZIL
  • FELIPE FLOR DEPARTMENT OF AERONAUTICAL ENGINEERING, SÃO CARLOS SCHOOL OF ENGINEERING, UNIVERSITY OF SÃO PAULO, AV. JOÃO DAGNONE, 1100, 13573-120, SÃO CARLOS, SP, BRAZIL
  • RICARDO MEDEIROS DEPARTMENT OF MECHANICAL ENGINEERING, COLLEGE OF TECHNOLOGICAL SCIENCES, SANTA CATARINA STATE UNIVERSITY-UDESC, RUA PAULO MALSCHITZKI 200, 89219-710, JOINVILLE, SC, BRAZIL
  • CARLOS PAGANI JR SÃO PAULO STATE UNIVERSITY (UNESP), CAMPUS OF SÃO JOÃO DA BOA VISTA, AV. PROF. ISETTE CORREA FONTÃO, 505, 13876-750,SÃO JOÃO DA BOA VISTA,SP, BRAZIL
  • VOLNEI TITA DEPARTMENT OF AERONAUTICAL ENGINEERING, SÃO CARLOS SCHOOL OF ENGINEERING, UNIVERSITY OF SÃO PAULO, AV. JOÃO DAGNONE, 1100, 13573-120, SÃO CARLOS, SP, BRAZIL

Abstract

THIS WORK AIMS TO CONTRIBUTE FOR THE DEVELOPMENT OF SHM SYS-TEMS BASED ON VIBRATION METHODS TO BE APPLIED ON SANDWICH STRUCTURES. THE MAIN OBJECTIVE IS FOCUSED ON EXPERIMENTAL DAM-AGE IDENTIFICATION VIA CHANGES IN THE FREQUENCY RESPONSE FUNC-TION (FRF) WITH THE USAGE OF DAMAGE METRICS. SPECIMENS OF SANDWICH STRUCTURES MADE FROM SKINS IN EPOXY RESIN REINFORCED BY GLASS FIBER AND A CORE OF PVC FOAM ARE MANUFACTURED. FIRST, PRELIMINARY NON-DAMPED FINITE ELEMENT (FE) MODELS ARE PER-FORMED, AND RESULTS OBTAINED ARE USED TO DEFINE THE FREQUENCY RANGE OF INTEREST FOR THE EXPERIMENTAL PROCEDURE. AFTER THAT, VI-BRATION EXPERIMENTAL ANALYSES ARE CARRIED OUT ON UNDAMAGED SPECIMENS. THE NATURAL FREQUENCIES ARE COMPARED TO THE PRELIMI-NARY FE RESULTS. SECOND, EXPERIMENTAL ANALYSES ARE PERFORMED ON DAMAGED SPECIMENS WITH PIEZOELECTRIC SENSORS OR NOT. THEN, DAMAGE METRIC VALUES ARE CALCULATED BASED ON FRFS FOR DAM-AGED AND UNDAMAGED STRUCTURES, WHICH WERE OBTAINED FROM EX-PERIMENTAL AND FE ANALYSES (WITH DAMPING EFFECTS). IN ADDITION, A NEW PROCEDURE IS PROPOSED TO IMPROVE THE QUALITY OF RESULTS PROVIDED BY THE DAMAGE METRIC. IT IS SHOWN THAT THE NEW PROCE-DURE IS VERY EFFECTIVE TO IDENTIFY THE DAMAGE USING BOTH AMPLI-TUDE AND PHASE FROM FRFS. LASTLY, IT IS DISCUSSED THE POTENTIALI-TIES AND LIMITATIONS OF THE FE MODEL TO PREDICT DAMAGE METRIC VALUES, COMPARING TO EXPERIMENTAL DATA.

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Published

2018-03-19

Issue

Vol 15 No 11 (2018) - MecSol 2017 Joinville

Section

MecSol 2017 Joinville

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