This paper presents a new non-destructive techniques method based on modal flexibility curvature matrix to detect the delamination in composite structures. The natural frequencies and the mode shapes of the composite beams are obtained using the experimental and finite element modal analysis. It has been found that the calculated modal flexibility curvature matrix can precisely identify the location and size of the delaminations in composite beam. Simultaneously, a new identification theory of delaminated composite plate is discussed, based on flexibility curvature matrix. However, Finite element analysis shows that flexibility curvature matrix, Fc can accurately identify the location and size of either single or multiple delaminations in composite plate.
CawleyP. The rapid non-destructive inspection of large composite structures. Composites1994; 25: 351–357.
2.
CastaingsMCawleyPFarlowR. Single sided inspection of composite materials using air coupled ultrasound. J Nondestruct Eval1998; 17: 37–45.
3.
SmithICHoaSV. Utilization of PVDF sensors to determine impact damage in graphite/epoxy plates by acousto-ultrasonic technique. J Reinf Plast Compos1994; 13: 111–127.
4.
ScarponiCBriottiG. Ultrasonic detection of delaminations on composite materials. J Reinf Plast Compos1997; 16: 768–790.
5.
LiuZHYuHTHeCF. Delamination damage detection of laminated composite beams using air-coupled ultrasonic transducers. Sci China Phys, Mech Astron2013; 56: 1269–1279.
6.
HentschelMPHarbichKWLangeA. Nondestructive evaluation of single fibre debonding in composites by X-ray refraction. NDT & E Int1994; 27: 275–280.
7.
HarbichKWHentschelMPSchorsJ. X-ray refraction characterization of non-metallic materials. NDT & E Int2001; 34: 297–302.
8.
LambrineasPDavisJRSuendermannB. X-ray computed tomography examination of inshore minehunter hull composite material. NDT & E Int1991; 24: 207–213.
9.
Lawrence WG, Thacker S, Palamakumbura S, et al. Quantum dot − organic polymer composite materials for X-ray detection and imaging. In:Nuclear science symposium conference record (NSS/MIC), 2010, IEEE, pp. 246–252.
10.
Sembach J, Wu D and Salerno A. Nondestructive evaluation of delaminations in laminated wood-based panels by thermographical inspection tools. In:Proceedings of workshop on non-destructive testing of panel products, 1997, pp. 41–48.
11.
BerglindHDillenzA. Detecting glue deficiency in laminated wood − a thermography method comparison. NDT & E Int2003; 36: 395–399.
12.
Srinivas K, Siddiqui AO and Lahiri J. Thermographic inspection of composite materials. In: Proc. National Seminar on Non-Destructive Evaluation. 2006, sn, Vol. 12, pp. 7–9.
13.
ShippenNCAdamsDF. Acoustic emission monitoring of damage progression in graphite/epoxy laminates. J Reinf Plast Compos1985; 4: 242–261.
14.
ZhuangXYanX. Investigation of damage mechanisms in self-reinforced polyethylene composites by acoustic emission. Compos Sci Technol2006; 66: 444–449.
15.
AzmiAIPrustyBG. Acoustic emission techniques for failure characterisation in composite top-hat stiffeners. J Reinf Plast Compos2012; 31: 495–516.
16.
RaghavendracharMAktanAE. Flexibility by multireference impact testing for bridge diagnostics. J Struct Eng1992; 118: 2186–2203.
17.
ZhaoJDeWolfJT. Sensitivity study for vibrational parameters used in damage detection. J Struct Eng1999; 125: 410–416.
18.
ZouYTongLStevenGP. Vibration-based model-dependent damage (delamination) identification and health monitoring for composite structures − a review. J Sound Vib2000; 230: 357–378.
19.
LestariWQiaoPHanagudS. Curvature mode shape-based damage assessment of carbon/epoxy composite beams. J Intell Mater Syst Struct2007; 18: 189–208.
20.
WuDLawSS. Damage localization in plate structures from uniform load surface curvature. J Sound Vib2004; 276: 227–244.
21.
LuK. Dynamics based damage detection of plate-type structures, Akron, OH: The University of Akron, 2005.
22.
QiaoPLestariWShahMG. Dynamics-based damage detection of composite laminated beams using contact and noncontact measurement systems. J Compos Mater2007; 41: 1217–1252.
23.
VaidyaASVaidyaUKUddinN. Impact response of three-dimensional multifunctional sandwich composite. J Mater sci Eng2008; 472: 52–58.
24.
PandeyAKBiswasMSammanMM. Damage detection from changes in curvature mode shapes. J Sound Vib1991; 145: 321–332.
25.
HuYChenMZQShuZ. Analysis and optimisation for inerter-based isolators via fixed-point theory and algebraic solution. J Sound Vib2015; 346: 17–36.
