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Adhesive Shear Stress

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D. W. Oplinger – One of the best experts on this subject based on the ideXlab platform.

  • evaluation and adjustments for astm d 5656 standard test method for thick adherend metal lap Shear joints for determination of the Stress strain behavior of Adhesives in Shear by tension loading
    Journal of Testing and Evaluation, 2001
    Co-Authors: Chihdar Charles Yang, Hai Huang, John Tomblin, D. W. Oplinger

    Abstract:

    Adhesive-bonded joints have been used widely for composite materials as a necessary alternative to conventional mechanical joint designs. In a bonded joint, the load is transferred from one substrate to the other mainly through Adhesive Shear Stress. One of the greatest drawbacks to predicting the mechanical behavior of bonded joints has been the lack of reliable data on the mechanical properties of Adhesives. Among many test methods that have been developed to test structural Adhesives in thin film geometries, the ASTM D 5656 “thick-adherend lap Shear test” is used frequently to determine the Shear properties of Adhesives while the samples are loaded in tension. Due to the nonuniformity of Adhesive Shear Stress distribution within the joint, through both the bondedline thickness and overlap length, and the measurement method described in the test method, some errors will be introduced if corrections are not made. A finite element analysis was conducted in order to provide a clear picture of the mechanical behavior of the ASTM D 5656 specimen under loading. Based on the results from finite element analysis, the sources of error were analyzed and three correction factors were introduced to recover the Adhesive Shear modulus of the specimen. Suggestions of mounting the KGR-1 measurement device are also given in order to avoid some of the errors. Because results from linear finite element analysis were used, only Adhesive Shear modulus within the linear range is discussed in this article.

  • Numerical Analysis of a Thick-Adherend Lap Shear Specimen
    Journal of Adhesion, 1997
    Co-Authors: Ming-yi Tsai, J. Morton, D. W. Oplinger

    Abstract:

    Abstract A finite element Stress analysis of a thick-adherend lap Shear specimen to determine the Adhesive Shear properties is performed. Key problems associated with this test specimen include the non-uniformity of Adhesive Stress fields, load eccentricity effects and other less well-characterized mechanics. The numerical model, validated by comparing with the moire experiment, is proposed for investigation of these problems. Full-field non-uniform Stress distributions in the test region are presented. The obtained Adhesive Shear Stress distributions are compared with those from the moire experiment and the classical theoretical solutions. It is shown that the present two-dimensional solutions agree well with experimental solutions while the theoretical solutions based on simple assumptions differ from those from the numerical and experimental analyses. Load eccentricity encountered in the experimental tests is investigated. It is shown that load eccentricity greatly affects the Adhesive Shear Stress dis…

  • In situ determination of Adhesive Shear moduli using strain gages
    Experimental Mechanics, 1996
    Co-Authors: Ming-yi Tsai, J. Morton, D. W. Oplinger

    Abstract:

    A new, convenient and cost-effective method of determining in situ Adhesive Shear moduli using strain gages is proposed and evaluated. Thick-adherend lap Shear specimens with stacked gage rosettes at the center of the bond line are loaded in tension for Adhesive Shear strain measurement. Experimental and numerical results indicate that the test specimen has a nonuniform Adhesive Shear Stress (or strain) distribution in the test section and that this distribution (except at the center point of the bond line) is greatly affected by load eccentricity. In addition to the nonuniformity in the Shear Stress distribution, the issue of material nonhomogeneity in the gage-covered region affects the strain gage measurement. By taking into account these two issues and assuming linear-elastic behavior, two approaches for converting the gage-measured Shear strain into the Adhesive Shear strain are developed and verified by experiment. It is shown that the strain gage measurement associated with either of two conversion techniques can determine the in situ Adhesive Shear moduli, which are comparable with moire experiment and KRG-1 extensometer measurements.

M Y Tsai – One of the best experts on this subject based on the ideXlab platform.

  • an investigation into the Stresses in double lap Adhesive joints with laminated composite adherends
    International Journal of Solids and Structures, 2010
    Co-Authors: M Y Tsai, John Morton

    Abstract:

    Abstract The mechanics of double-lap joints with unidirectional ([0 16 ]) and quasi-isotropic ([0/90/−45/45] 2S ) composite adherends under tensile loading are investigated experimentally using moire interferometry, numerically with a finite element method and analytically through a one-dimensional closed-form solution. Full-field moire interferometry was employed to determine in-plane deformations of the edge surface of the joint overlaps. A linear-elastic two-dimensional finite element model was developed for comparison with the experimental results and to provide deformation and Stress distributions for the joints. Shear-lag solutions, with and without the inclusion of Shear deformations of the adherend, were applied to the prediction of the Adhesive Shear Stress distributions. These Stress distributions and mechanics of the joints are discussed in detail using the results obtained from experimental, numerical and theoretical analyses.

  • In situ determination of Adhesive Shear moduli using strain gages
    Experimental Mechanics, 1996
    Co-Authors: M Y Tsai, J. Morton, D. W. Oplinger

    Abstract:

    A new, convenient and cost-effective method of determining in situ Adhesive Shear moduli using strain gages is proposed and evaluated. Thick-adherend lap Shear specimens with stacked gage rosettes at the center of the bond line are loaded in tension for Adhesive Shear strain measurement. Experimental and numerical results indicate that the test specimen has a nonuniform Adhesive Shear Stress (or strain) distribution in the test section and that this distribution (except at the center point of the bond line) is greatly affected by load eccentricity. In addition to the nonuniformity in the Shear Stress distribution, the issue of material nonhomogeneity in the gage-covered region affects the strain gage measurement. By taking into account these two issues and assuming linear-elastic behavior, two approaches for converting the gage-measured Shear strain into the Adhesive Shear strain are developed and verified by experiment. It is shown that the strain gage measurement associated with either of two conversion techniques can determine the in situ Adhesive Shear moduli, which are comparable with moiré experiment and KRG-1 extensometer measurements.

Naglaa Kandil – One of the best experts on this subject based on the ideXlab platform.

  • optimization of tubular double lap joint configuration
    Polymer Composites, 2002
    Co-Authors: Faissal Abd Elhady, Naglaa Kandil

    Abstract:

    The potential of using composite materials with a polymer base in the automotive industry has grown rapidly. However, one of the main problems encountered is bonding the composite part to metal conventional parts. This paper studies a proposed tubular double lap joint to bond a composite shaft to a metallic end. The automotive driveshaft will be taken as an application throughout this paper. A mathematical model of this joint is presented and a finite element solution has been carried out in order to validate the mathematical model. The optimization objective is to minimize the Shear Stress level in the Adhesive layer. The results show that one can obtain up to 50% reduction in the level of Adhesive Shear Stress. This can be achieved through an optimum selection of lap geometry.

  • Optimization of tubular double lap‐joint configuration
    Polymer Composites, 2002
    Co-Authors: Faissal Abd El-hady, Naglaa Kandil

    Abstract:

    The potential of using composite materials with a polymer base in the automotive industry has grown rapidly. However, one of the main problems encountered is bonding the composite part to metal conventional parts. This paper studies a proposed tubular double lap joint to bond a composite shaft to a metallic end. The automotive driveshaft will be taken as an application throughout this paper. A mathematical model of this joint is presented and a finite element solution has been carried out in order to validate the mathematical model. The optimization objective is to minimize the Shear Stress level in the Adhesive layer. The results show that one can obtain up to 50% reduction in the level of Adhesive Shear Stress. This can be achieved through an optimum selection of lap geometry.