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    Experimental and Analytical Investigations of the Dynamic Response of Adhesively Bonded Single Lap Joints

    Source: Journal of Vibration and Acoustics:;2004:;volume( 126 ):;issue: 001::page 84
    Author:
    A. Vaziri
    ,
    H. R. Hamidzadeh
    ,
    H. Nayeb-Hashemi
    DOI: 10.1115/1.1596550
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Dynamic response of single lap joints, subjected to a harmonic peeling load is studied theoretically and experimentally. In the theoretical part, dynamic response of a single lap joint clamped at one end and subjected to a harmonic peeling load at the other end is investigated. Adherents are modeled as Euler-Bernouli beams joined in the lap area by a viscoelastic adhesive layer. Both axial and transverse deformations of adherents are considered in deriving the equations of motion. The effects of adhesive layer thickness, mechanical properties and its loss factor on the dynamic response of the joint are investigated. Furthermore, effects of defects such as a void in the lap area on the dynamic response of the joints are studied. The results showed that frequencies where peak amplitudes occurred were little dependent on the adhesive loss factor. However, peak amplitudes reduced for joints with a higher adhesive loss factor. Furthermore, the results indicated that for the joint geometries and properties investigated the system resonant frequencies were not affected by the presence of a central void covering up to 80% of the overlap length. In the experimental part, single lap joints were fabricated using 6061-T6 Aluminum. Adherents were joined together using Hysol EA 9689 adhesive film. Joints with various central voids were manufactured by removing adhesive film from the desired area of lap joints prior to bonding adherents. Dynamic responses of the joints were investigated using the hammer test technique. The system response was measured using both an accelerometer and a noncontact laser vibrometer. The natural frequencies of the joints obtained by using the laser vibrometer were very close to those obtained theoretically. However, natural frequencies obtained by using an accelerometer depended on the accelerometer location in the system, which was attributed to its mass contribution to the over- all system mass. A central void covering less than 80% of the overlap length had little effect on the system resonance frequencies. This was in agreement with the theoretical results. In contrast total system-damping ratios were a function of the void size. Joints without a void exhibited higher damping.
    keyword(s): Shear (Mechanics) , Equations of motion , Mechanical properties , Damping , Dynamic response , Frequency , Thickness , Adhesives , Accelerometers , Stress , Deformation , Product quality , Laser Doppler vibrometers , Hammers AND Resonance ,
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      Experimental and Analytical Investigations of the Dynamic Response of Adhesively Bonded Single Lap Joints

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    http://yetl.yabesh.ir/yetl1/handle/yetl/131093
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    • Journal of Vibration and Acoustics

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    contributor authorA. Vaziri
    contributor authorH. R. Hamidzadeh
    contributor authorH. Nayeb-Hashemi
    date accessioned2017-05-09T00:14:51Z
    date available2017-05-09T00:14:51Z
    date copyrightJanuary, 2004
    date issued2004
    identifier issn1048-9002
    identifier otherJVACEK-28868#84_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/131093
    description abstractDynamic response of single lap joints, subjected to a harmonic peeling load is studied theoretically and experimentally. In the theoretical part, dynamic response of a single lap joint clamped at one end and subjected to a harmonic peeling load at the other end is investigated. Adherents are modeled as Euler-Bernouli beams joined in the lap area by a viscoelastic adhesive layer. Both axial and transverse deformations of adherents are considered in deriving the equations of motion. The effects of adhesive layer thickness, mechanical properties and its loss factor on the dynamic response of the joint are investigated. Furthermore, effects of defects such as a void in the lap area on the dynamic response of the joints are studied. The results showed that frequencies where peak amplitudes occurred were little dependent on the adhesive loss factor. However, peak amplitudes reduced for joints with a higher adhesive loss factor. Furthermore, the results indicated that for the joint geometries and properties investigated the system resonant frequencies were not affected by the presence of a central void covering up to 80% of the overlap length. In the experimental part, single lap joints were fabricated using 6061-T6 Aluminum. Adherents were joined together using Hysol EA 9689 adhesive film. Joints with various central voids were manufactured by removing adhesive film from the desired area of lap joints prior to bonding adherents. Dynamic responses of the joints were investigated using the hammer test technique. The system response was measured using both an accelerometer and a noncontact laser vibrometer. The natural frequencies of the joints obtained by using the laser vibrometer were very close to those obtained theoretically. However, natural frequencies obtained by using an accelerometer depended on the accelerometer location in the system, which was attributed to its mass contribution to the over- all system mass. A central void covering less than 80% of the overlap length had little effect on the system resonance frequencies. This was in agreement with the theoretical results. In contrast total system-damping ratios were a function of the void size. Joints without a void exhibited higher damping.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental and Analytical Investigations of the Dynamic Response of Adhesively Bonded Single Lap Joints
    typeJournal Paper
    journal volume126
    journal issue1
    journal titleJournal of Vibration and Acoustics
    identifier doi10.1115/1.1596550
    journal fristpage84
    journal lastpage91
    identifier eissn1528-8927
    keywordsShear (Mechanics)
    keywordsEquations of motion
    keywordsMechanical properties
    keywordsDamping
    keywordsDynamic response
    keywordsFrequency
    keywordsThickness
    keywordsAdhesives
    keywordsAccelerometers
    keywordsStress
    keywordsDeformation
    keywordsProduct quality
    keywordsLaser Doppler vibrometers
    keywordsHammers AND Resonance
    treeJournal of Vibration and Acoustics:;2004:;volume( 126 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian