Nondestructive detection of weak joints in adhesively bonded composite structures

“…One key benefit of adhesive bonding over traditional methods, such as the use of rivets, is that adhesive bonds lead to more uniform stress distributions [11]. Yet, the use of adhesive bonds also makes a component susceptible to damage/flaws that are difficult to detect.…”

Section: Wave Interaction With Weak Bondsmentioning

confidence: 99%

“…Previous work in the field of modeling weak bonds has involved approaches such as transitioning from welded to slip boundary conditions at the interface using spring boundaries [16][17][18]. Contact-friction interfaces and periodic air or water filled voids are also approaches that have been used to model weak bonds [11]. Incorporating a simple change of boundary conditions into the EFIT code is a straight-forward task, making the technique ideal for incorporating weak bond models.…”

Section: Wave Interaction With Weak Bondsmentioning

confidence: 99%

3D modeling of ultrasonic wave interaction with disbonds and weak bonds

Leckey

Hinders

2012

AIP Conference Proceedings

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ABSTRACT. Ultrasonic techniques, such as the use of guided waves, can be ideal for finding damage in the plate and pipe-like structures used in aerospace applications. However, the interaction of waves with real flaw types and geometries can lead to experimental signals that are difficult to interpret. 3-dimensional (3D) elastic wave simulations can be a powerful tool in understanding the complicated wave scattering involved in flaw detection and for optimizing experimental techniques. We have developed and implemented parallel 3D elastodynamic finite integration technique (3D EFIT) code to investigate Lamb wave scattering from realistic flaws. This paper discusses simulation results for an aluminum-aluminum diffusion disbond and an aluminum-epoxy disbond and compares results from the disbond case to the common artificial flaw type of a flat-bottom hole. The paper also discusses the potential for extending the 3D EFIT equations to incorporate physics-based weak bond models for simulating wave scattering from weak adhesive bonds.

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“…The defect regions could be indicated by the interferogram fringe patterns. Yang et al [12] implemented a nondestructive detection that was vibration damping and frequency measurement to evaluate the defects in composite joints. Llopart et al [13] also carried out a nondestructive test on the bonded specimens by means of ultrasonic C-scan and X-ray imaging, for a purpose of assuring that the adhesive had spread out to the full bonding surface.…”

Section: Introductionmentioning

confidence: 99%

Strength analysis of metallic bonded joints containing defects

Wei

2012

Computational Materials Science

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a b s t r a c tFinite element simulation has been utilized to study the overall strength of metallic single lap joints with defects in their adhesive layers. Three types of defects are taken into account respectively, which are local debonding, weak bonding and void. For the first two types of defects, a developed numerical method using the cohesive zone model modified by user-defined subroutines is carried out as to consider the influences of the defect size and location. Furthermore, a modified-Gurson model is employed to simulate the adhesive layer with voids, considering the influence of the void size. The results show that the overall strength of the joints diminishes as the defect size is increased. Especially, the adhesive fracture properties and the size of the weak bonding region have combined influences on the strength of the joints.Crown

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Nondestructive detection of weak joints in adhesively bonded composite structures

Cited by 103 publications

References 3 publications

Development of Infrared Techniques for Practical Defect Identification in Bonded Joints

Development of Infrared Techniques for Practical Defect Identification in Bonded Joints

3D modeling of ultrasonic wave interaction with disbonds and weak bonds

Strength analysis of metallic bonded joints containing defects

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