ASTM D1781 Climbing Drum Peel for Adhesives

The ASTM D1781 test method determines the peel resistance of adhesive bonds between two materials with different physica l properties. It measures the peel resistance between: ❖ a relatively flexible adherend and a rigid adherend ❖ a relatively flexible facing of a sandwich structure and its core.... Read More

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    Scope:

    ASTM D1781 is a standard test method for determining the adhesive bond peel resistance on items with a flexible adherend and a rigid adherend surface. By removing the sandwich assembly’s face, this standard can also be used to examine the structure and core of a sandwich. The purpose is to determine how much torque is needed to peel the two materials. The ASTM D1781 test is most commonly used in A-B comparison testing, which compares the outcomes of two alternative process conditions in order to improve a process. For moderately brittle adhesives, peel resistance may also indicate the degree of cure.

    Procedure:

    The climbing drum peel fixture with the specimen is put in the test frame for the ASTM D1781  test process. The average peeling load between 1 inch and 6 inches of adherend separation is determined by applying a tensile force at a constant rate of crosshead separation. The amount of crosshead movement required is determined by the ascending drum peel fixture’s shape. A  standard formula is used to calculate the average peeling torque or average peeling load. 

    Video 01: ASTM D1781 Climbing drum peel test on an aluminum composite panel

    Specimen size:

    As per the ASTM D1781 test method: 

    ➢ For evaluation of adhesives in laminated assemblies, the specimen is 25 mm wide between saw kerfs and at least 254 mm long. 

    ➢ For evaluation of adhesives in sandwich constructions, the specimen is 76 mm wide and at least 305 mm (12 in.) long. 

    Data : 

    According to the ASTM D1781 test, the average peel torque, T, is calculated as follows. T=[(R-r)(F-f)]/W]

    where,  

    T = average peel torque, mm.kg/mm of width

    R = radius of the flange, including one half the thickness of the loading straps, in mm  

    r = radius of the drum plus one half the thickness of the adherend being peeled, in mm  

    F = average load required to bend and peel the adherend plus the load required to overcome the resisting torque, kg  

    f = load required to overcome the resisting torque, in pound and  

    w = width of the specimen, in mm

    Conclusion:

    ASTM D1781 is a standard test method for determining the adhesive bond peel resistance on items with a flexible adherend and a rigid adherend surface.

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