An effective and novel method was developed to measure the Mode-I dynamic fracture initiation toughness, K I d , of adhesive bonds. A bonded joint assembly of an epoxy-filled cylindrical specimen with a spiral crack was loaded under dynamic torsion using the torsional Hopkinson bar apparatus. Cylindrical samples were made from an aluminum solid bar, and Epothin 2 was used as a bonding material. During testing, the cylindrical specimen was firmly attached to the incident and transmitter bars using a male–female hexagonal joint. The torsional load at the point of fracture was determined from strain data collected using strain gauges mounted on the bars. An analytical solution for spiral cracks subjected to torsion was developed to calculate the dynamic fracture toughness of the bonded joint specimens using the measured torsional load at fracture. The complete time history of the Mode-I stress intensity factor, K I ( t ) , was obtained, allowing for the determination of the dynamic fracture initiation toughness K I d . The proposed specimen configuration under torsional loading provides a promising technique for investigating the dynamic fracture toughness of polymer bonds at high strain rates while minimizing the influence of inertial effects. Furthermore, the experimental–numerical framework presented in this study can be extended to analyze polymaterial assemblies and mixed-mode fracture behaviors.


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    Title :

    Novel Specimen Configuration to Investigate the Dynamic Mode-I Fracture of Adhesive Bond


    Contributors:

    Published in:

    Publication date :

    2025-07-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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