Adhesive bonding is a promising joining method for composite materials. This article focuses on the use of modal content-based damage indicators to improve the sensitivity of guided waves to disbonds in the adhesive. Wave-defect interaction is modeled using frequency-domain finite element analysis in order to identify modes sensitive to adhesive degradation in joints between carbon fiber–reinforced polymer laminates. Phased array transducers and multielement array sensors designed for structural health monitoring are employed to enable preferential mode excitation and modal content extraction, respectively. The domains in dispersion curve space predicted to have good, intermediate, and no sensitivity to disbond were experimentally found to have good, intermediate, and limited sensitivity using a feature of the received signals associated with the modal amplitude or a modal amplitude ratio. Furthermore, the modal amplitude was found to decrease monotonically with increasing disbond size, demonstrating that it has potential to quantitatively size disbonds.
DeoRBStarnesJHHolzwarthRC. Low-cost composite materials and structures for aircraft applications. In: NATO RTO AVT Panel spring symposium and specialists’ meeting, Loen, 2001. The conference is held in Loen, Norway, 7–11 May 2001.
5.
SullivanM.Defense acquisitions: CH-53K Helicopter Program has addressed early difficulties and adopted strategies to address future risks. Collingdale, PA: DIANE Publishing, 2011.
6.
HigginsA.Adhesive bonding of aircraft structures. Int J Adhes Adhes2000; 20(5): 367–376.
7.
PetrieEM.Adhesives for the assembly of aircraft structures and components: decades of performance improvement, with the new applications of the horizon. Met Finish2008; 106(2): 26–31.
8.
StaszewskiWBollerCTomlinsonGR.Health monitoring of aerospace structures: smart sensor technologies and signal processing. Chichester: Wiley, 2004.
9.
BollerC.Next generation structural health monitoring and its integration into aircraft design. Int J Syst Sci2000; 31(11): 1333–1349.
10.
RoseJL.Ultrasonic guided waves in solid media. Cambridge; New York: Cambridge University Press, 2014.
11.
RokhlinSIHefetsMRosenM.An ultrasonic interface-wave method for predicting the strength of adhesive bonds. J Appl Phys1981; 52(4): 2847–2851.
12.
RokhlinSI.Lamb wave interaction with lap-shear adhesive joints: theory and experiment. J Acoust Soc Am1991; 89: 2758–2765.
13.
RoseJLDitriJJ.Pulse-echo and through transmission lamb wave techniques for adhesive bond inspection. Brit J Nondestr Test1992; 34: 591–594.
14.
LoweMJSCawleyP. The applicability of plate wave techniques for the inspection of adhesive and diffusion bonded joints. J Nondestruct Eval1994; 13(4): 185–200.
15.
KunduTMaslovK.Material interface inspection by lamb waves. Int J Solids Struct1997; 34(29): 3885–3901.
16.
Lanza di ScaleaFRizzoPMarzaniA.Propagation of ultrasonic guided waves in lap-shear adhesive joints: case of incident a0 Lamb wave. J Acoust Soc Am2004; 115: 146–156.
17.
PuthillathPKKannajosyulaHLissendenCJ. Ultrasonic guided wave inspection of adhesive joints: a parametric study for a step-lap joint. AIP Conf Proc2009; 1096(1): 1127–1133.
18.
KannajosyulaHLissendenCJRoseJL.Inhomogeneous interface waves in a thin layer between half spaces and their relationship to lamb waves. AIP Conf Proc2010; 1211(1): 104–110.
PuthillathPRoseJL.Ultrasonic guided wave inspection of a titanium repair patch bonded to an aluminum aircraft skin. Int J Adhes Adhes2010; 30(7): 566–573.
21.
BostronJHRoseJLMooseCA.Ultrasonic guided interface waves at a soft-stiff boundary. J Acoust Soc Am2013; 134(6): 4351–4359.
22.
PhiltronJHRoseJL.Mode perturbation method for optimal guided wave mode and frequency selection. Ultrasonics2014; 54: 1817–1824.
23.
MattHBartoliILanza di ScaleaF.Ultrasonic guided wave monitoring of composite wing skin-to-spar bonded joints in aerospace structures. J Acoust Soc Am2005; 118(4): 2240–2252.
24.
QuaegebeurNMicheauPMassonP. Methodology for optimal configuration in structural health monitoring of composite bonded joints. Smart Mater Struct2012; 21(10): 105001.
25.
RenBLissendenCJ.Ultrasonic guided wave inspection of adhesive bonds between composite laminates. Int J Adhes Adhes2013; 45: 59–68.
26.
GardnerMDRoseJLMooseCA.Ultrasonic guided wave inspection of an interface between an anisotropic layer and a metallic half space. AIP Conf Proc2013; 1511(1): 207–214.
27.
FeihSShercliffHR.Composite failure prediction of single-L joint structures under bending. Compos Part A: Appl S2005; 36(3): 381–395.
28.
AndrewsJRPenadoFEBroomeSC. Characterization of the lightweight telescope developed for the NPOI. Proc SPIE2006; 6267: 62673Q.
29.
HayashiTSongW-JRoseJL.Guided wave dispersion curves for a bar with an arbitrary cross-section, a rod and rail example. Ultrasonics2003; 41(3): 175–183.
30.
ChillaraVKRenBLissendenCJ.Guided wave mode selection for inhomogeneous elastic waveguides using frequency domain finite element approach. Ultrasonics2016; 67: 199–211.
31.
RenBLissendenCJ.Phased array transducers for ultrasonic guided wave mode control and identification for aircraft structural health monitoring. Mater Eval2015; 73(8): 1089–1100.
32.
RenBLissendenCJ.PVDF multielement Lamb wave sensor for structural health monitoring. IEEE T Ultrason Ferr2016; 63(1): 178–185.
33.
AlleyneDCawleyP.A two-dimensional Fourier transform method for the measurement of propagating multimode signals. J Acoust Soc Am1991; 89(3): 1159–1168.
