Journal of The Adhesion Society of Japan
Online ISSN : 2187-4816
Print ISSN : 0916-4812
ISSN-L : 0916-4812
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Comprehensive Paper
  • The Adhesive Strength Evaluation Method in Terms of Intensity ofSingular Stress Field（ ISSF）（ Fracture Origin in Relation to the ISSF）
    Rei TAKAKI, Nao-Aki NODA, Daiki ISHIDA, Yoshikazu SANO, Yasuaki SUZUKI
    2022 Volume 58 Issue 1 Pages 4-14
    Published: January 01, 2022
    Released on J-STAGE: December 13, 2024
    DOIhttps://doi.org/10.11618/adhesion.58.4
    JOURNAL FREE ACCESS
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    Most of the adhesive joint strength can be expressed as a constant value of the intensity of singular stress

    field （ISSF）. The detail microscopic observation showed the adhesive fracture is cohesive and most of the

    facture surface is close to the interface. This is because typical fracture pattern such as mirror, mist and

    hackle pattern can be seen for butt joint and feather pattern can be seen for scarf joint. For the scarf joint, the

    characteristic feather pattern can be seen due to the large shear stress at the interface. For both scarf and butt

    joints, it is seen that the fracture originates from microcracks about 20μm depth at the interface edge. When

    the adhesive thickness is larger than 5mm, the adhesive strength is smaller because the fracture occurs across

    the adhesive layer and no fracture near the interface.

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