Information on the most widely used ASTM standards within the materials testing industry
ASTM D1876
Climbing drum test fixture is a typical peel testing method used to determine the de-lamination characteristics of adhesives used to bond different materials together.
This test covers the determination of the peel resistance of adhesive bonds between a relatively flexible adherent and the relatively flexible facing of a sandwich structure and its core.
The fixture consists of a flanged drum, flexible loading straps connected to an adapter, and clamps for holding the test specimen.
ASTM D1781: Standard Test Method for Climbing Drum Peel for Adhesives
General introduction
Climbing drum test fixture is a typical peel testing method used to
determine the de-lamination characteristics of adhesives used to bond
different materials together.
This test covers the determination of
the peel resistance of adhesive bonds between a relatively flexible
adherent and the relatively flexible facing of a sandwich structure and
its core.
The fixture consists of a flanged drum, flexible loading straps connected to an adapter, and clamps for holding the test specimen.
ASTM D1781: Standard Test Method for Climbing Drum Peel for Adhesives
ASTM D1781 climbing drum test 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 torgue 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.
Test 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 25mm (1 inch) and 150mm (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.

Features
In each case the surface adherend is relatively flexible and the backing material is very rigid. In order to peel the flexible material from the rigid backing material and accurately measure the peel strength, a special device called a climbing drum peel fixture (shown) is used. The peel fixture ensures that only “peeling” forces are applied to the flexible adherend/rigid adherend interface thus ensuring accurate measurement of peel resistance.
Honeycomb structural panels are a common adhesive assembly that requires ASTM D1781 testing. These panels provide high stiffness and strength with low weight for aerospace and industrial applications. The adhesive used for the sandwich panel construction is critical to ensure structural integrity. Testing can be complicated due to high adhesion strength and the dimensional rigidity of the core section, and the fact that the facing panels are not completely flexible.
Main technical specification
Maximum Load: 5 kN
Specimen Thickness: up to 13 mm
Specimen Width: 45 mm (customized)
Specimen Length: 254 mm
Thread connection: M12
Drum diameter: 100mm ± 0.10mm
Drum flange diameter: 125mm ± 0.10mm
Net weight of the drum: 2kg
Outer dimensions: 130*130*115mm
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