The method of non-linear ultrasound as a tool for the non-destructive inspection of structural epoxy-metal bonds—a résumé

Bockenheimer, Clemens; Fata, Davis; Possart, Wulff; Rothenfusser, M.; Netzelmann, U.; Schaefer, H.

doi:10.1016/s0143-7496(01)00058-6

Cited by 17 publications

(9 citation statements)

References 4 publications

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“…Joint dimensions evaluation comprised the following measurements: overlap length, adhesive layer thickness, joint length and width, as well as perpendicular and parallel orientation of adhered elements [1,11,24]. L.D.R.…”

Section: Evaluation Criteria In the Visual Methodsmentioning

confidence: 99%

“…Due to the fact that adhesive bonding is regarded as a special joining process it requires specific approach, accounting for the necessity to apply a variety of different test methods to control the finished joint, as well as joint formation processes [7][8][9][10][11]. That is why a complex control of adhesively bonded joints is most frequently required, and this may include the following tests [12-16, 17, 18]:…”

Section: Introductionmentioning

confidence: 99%

“…norms, commissioning requirements and other regulations. Commonly assisted by other non-destructive testing methods, it constitutes the first basic control stage, consisting in visual inspection for discrepancies observable with a naked eye or with the aid of appropriate tools, usually optic, frequently preceded by the measurement of their characteristic dimensions [1,7,11]. Visual inspection requires compliance with basic conditions regarding the correctness of control, such as: having required qualifications, good eyesight, appropriate luminous intensity (500 lux) as well as the ability to distinguish and interpret inaccuracies [20].…”

Section: Introductionmentioning

confidence: 99%

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The Visual Method in Quality Assessment of Single-Lap Adhesive Joints

Rudawska¹,

Stančeková²,

Brzęczek³

2016

Adv. Sci. Technol. Res. J.

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This article presents selected criteria for the quality assessment of single-lap adhesive joints formed on 0.66±0.04 thick hot dip zinc coated sheets with the hot dip zinc coating thickness equal to 18 µm. Three types of epoxy adhesives and three variants of the mass of adhesives were tested (1 g, 2 g and 3 g). The work intended to assess the capacity of the visual method with regard to evaluating joint quality, allowing for the presence and the size of spew fillet, joint dimensions and the effect of spew fillet on adhesive joint strength. The strength of analysed adhesive joints was determined in destructive tests.

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Section: Evaluation Criteria In the Visual Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Visual Method in Quality Assessment of Single-Lap Adhesive Joints

Rudawska¹,

Stančeková²,

Brzęczek³

2016

Adv. Sci. Technol. Res. J.

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“…Most NDE techniques for adhesive joints focus on detecting defects like cracks, voids or porosity in the adhesive layer [4][5][6]. These techniques do not provide indications regarding the strength of adhesion, a phenomenon predominant only at the joint interface [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Vibration Analysis for Damage Detection in Metal-to-Metal Adhesive Joints

Pandurangan

Buckner

2006

Exp Mech

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Vibration based non-destructive evaluation shows promise for damage detection in metal-to-metal adhesive joints. This research investigates an experimental technique to diagnose damage in single-lap adhesive joints subject to cyclical tensile loading. Vibration analysis reveals that damage can be correlated with changes in identified modal damping ratios. Constant amplitude forcing functions are employed to eliminate amplitude-dependent nonlinearities in the dynamic response profiles. Damping estimates obtained from time-domain analyses correlate well with damage magnitudes. Finite element modal analysis of the lap joints supports the experimental results.

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“…There have been a number of previous attempts to relate the appearance of higher harmonics in the transmission of ultrasound through bonded structures to the quality of the bonds [2][3][4][5][6][7][8][9]. Commonly used is the so-called nonlinearity parameter b 2 , a measure of the generation of only the second harmonic [2], and the distortion factor K which describes the complete nonlinear content of the response [7].…”

Section: Introductionmentioning

confidence: 99%

Calibration and Evaluation of Nonlinear Ultrasonic Transmission Measurements of Thin‐Bonded Interfaces

et al. 2005

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Interfaces in bonded structures influence the mechanical behavior of components significantly, and often limit their load capacity. This requires nondestructive testing techniques allowing one to investigate the interaction forces in adhesive joints and to evaluate the quality of bonds. To this end the nonlinear stress-strain relationships of adhesives and adhesive interfaces, which cause a nonlinear modulation of ultrasonic waves in reflection as well as in transmission, may be exploited. Bonded interfaces which are much thinner than the ultrasonic wavelength can be approximately described only by the binding forces, without explicitly taking into account the material properties of the adhesive layers. These may be measured by the amplitudes and phases of ultrasonic waves transmitted through the interface. Measurements are presented on aluminum plates joined together by thin epoxy adhesive layers. A threshold behavior of the harmonics generated in the adhesive layer has been observed. Their amplitudes depend on the excitation following the power series expansion of a quasi-static interaction force curve, and their phases vary little for low-amplitude excitation. Exceeding the threshold causes a change in the response of the interface. The input and output ultrasonic amplitudes in the interface are calibrated interferometrically to obtain the absolute interaction force. The ultrasonic transmission data are related to destructive tensile tests of the adhesive bonds. IntroductionThe interfaces in bonded structures influence the mechanical behavior of components significantly. Therefore, an important task in nondestructive testing (NDT) is the investigation of the interaction forces in adhesive joints and the development of techniques to evaluate the bond quality. The load capacity of such joints is often limited by regions of weak bonding. As in all materials, the 403 Adhesion -Current Research and Application. Wulff Possart

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The method of non-linear ultrasound as a tool for the non-destructive inspection of structural epoxy-metal bonds—a résumé

Cited by 17 publications

References 4 publications

The Visual Method in Quality Assessment of Single-Lap Adhesive Joints

The Visual Method in Quality Assessment of Single-Lap Adhesive Joints

Vibration Analysis for Damage Detection in Metal-to-Metal Adhesive Joints

Calibration and Evaluation of Nonlinear Ultrasonic Transmission Measurements of Thin‐Bonded Interfaces

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