Debond and failure characteristics of a double-lap adhesively bonded joint

Mantena, Raju; Gibson, Ronald F.; Place, T.A.; Srivatsan, T. S.; Sudarshan, T. S.

doi:10.1163/156856188x00192

Cited by 5 publications

(1 citation statement)

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“…Therefore, changes in physical properties of a structure due to damage can result in detectable variations in its modal parameters, such as natural frequencies, mode shapes and modal damping. A number of studies have been carried out to show the effectiveness of dynamic response measurements for NDT of composites [8,9]. Duo to service or influence of environment any initial tiny damage can reach a notable level, which induces danger or even serious accident.…”

Section: Introductionmentioning

confidence: 99%

Damage Detection of Composite Structures Using Dynamic Analysis

Yam

Cheng

Wei

et al. 2005

KEM

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A study on the use of modal parameter analysis for damage detection of structures made of composites is conducted. The damage-induced variations of modal parameters are investigated both numerically and experimentally. An appropriate finite element model is proposed to analyze the dynamic characteristics of different types of structures made of composites, such as honeycomb sandwich plates and multi-layer composite plates, with internal cracks and delamination. The numerical results are in good agreement with experimental results available in the literature. Natural frequencies, modal displacements, strains and energy are analyzed for the determination of damage severity and location. Vibration measurements are carried out using piezoelectric patch actuators and sensors for comparison and verification of the FEM model proposed in this study. Energy spectrum for wavelet packets decomposition of structural dynamic responses is used to highlight the features of damaged samples. The mechanism of mode-dependent energy dissipation of composite plates due to delamination is revealed for the first time. Experimental results clearly show the dependence of changes of modal parameters on damage size and location. The results obtained in this study show that the measured modal damping change combined with the computed modal strain energy distribution can be used to determine the location of delamination in composite structures. Both numerical and experimental findings in this study are significant to the establishment of guideline for size and location identification of damage in composite structures.

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Section: Introductionmentioning

confidence: 99%

Damage Detection of Composite Structures Using Dynamic Analysis

Yam

Cheng

Wei

et al. 2005

KEM

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Modal parameter evaluation of degraded adhesively bonded composite beams

Yang

Gibson

et al. 1998

Composite Structures

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Impulse-Frequency Response and EIS Based NDE for Characterizing Bond Integrity of Adhesive Joints Subjected to Environmental Degradation

Anakapalli

Mantena

Al‐Ostaz

et al. 2005

Design Engineering, Parts a and B

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Single-Lap Joint (SLJ) and three-point end-notched flexure (ENF) joint configurations were used to bond 1” × 1/8″ (25.4mm × 3.175mm) aluminum 2024 T-4 adherends using a range of 3M™ high performance pressure sensitive adhesives (Adhesives 69, 73 and 85) and VHB™ acrylic foam tapes (Foam 41, 50, 52). Batches of bonded specimens were subjected to two types of aggressive environments simulating extreme service conditions: freeze-thaw cycling from 10°F to 50°F at 6 cycles per day (ASTM C666 Procedure A) for 21 days with samples immersed in water; heat-cool cycling (with 90% of maximum recommended temperature by the manufacturer of both acrylic foam and adhesive transfer tapes attained at 70% relative humidity) and 3 cycles per day for 21 days. Electrochemical Impedance Spectroscopy (EIS) and Fast Fourier Transform (FFT) based impulse frequency response vibration Non-Destructive Evaluation (NDE) techniques were used to monitor overall bond integrity.

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Debond and failure characteristics of a double-lap adhesively bonded joint

Cited by 5 publications

References 0 publications

Damage Detection of Composite Structures Using Dynamic Analysis

Damage Detection of Composite Structures Using Dynamic Analysis

Modal parameter evaluation of degraded adhesively bonded composite beams

Impulse-Frequency Response and EIS Based NDE for Characterizing Bond Integrity of Adhesive Joints Subjected to Environmental Degradation

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