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 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.

ASTM D1781:  Standard Test Method for Climbing Drum Peel for Adhesives

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.

Description:

A climbing drum test 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.

Specification: 

1. Thread connection: M12

2. Drum diameter: 100mm ± 0.10mm

3. Drum flange diameter: 125mm ± 0.10mm

4. Net weight of the drum: 1.5kg

5. Outer dimensions: 130*130*115mm