Climbing Drum Peel for Adhesives ASTM D1781

Climbing Drum Peel for Adhesives ASTM D1781

The ASTM D1781 test method determines the peel resistance of adhesive bonds between two materials with different physical properties. As 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.

    Scope:

    ASTM D1781 is a standard test method for determining 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 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 1inch 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 average peeling torque or average peeling load.

    Specimen size:

    As per the ASTM D1781: 

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

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

    Data:

    According to 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 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

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