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ASTM D1781 Climbing drum peel fixture for adhesives
Climbing Drum Peel Testing Fixture ASTM D1876

Climbing Drum Peel Testing Fixture

ASTM D1781

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.

Climbing Drum Peel Testing Fixture


Features

  • Surface flexible and backing material rigid

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: 102mm ± 0.10mm
Drum flange diameter: 125mm ± 0.10mm
Net weight of the drum: 2kg
Outer dimensions: 130*130*115mm

Standard

ASTM D1781 Peeling Test for Climbing Drum Method for Adhesives

ASTM D1781 Standard Test Method for Climbing Drum Peel for Adhesives

ASTM D1781 measures the peel resistance of an adhesive bond when a relatively flexible adherend is peeled from a rigid adherend, or when a flexible face sheet of a sandwich structure is peeled from its core.

It is especially used for adhesively bonded sandwich panels, e.g. aluminum or composite skin bonded to honeycomb, foam, or other lightweight core.

EN 2243-3 Peeling Test of Metal Sheet Aluminium Honeycomb Core

EN 2243-3 — Aerospace Series — Non-Metallic Materials — Structural Adhesives — Test Method — Part 3: Peeling Test Metal–Honeycomb Core

EN 2243-3 defines the peel strength determination of structural adhesives used in metal skin-to-aluminium honeycomb core joints. It can be performed at ambient or other specified temperatures.

It is part of the European aerospace non-metallic materials standards family and is commonly used for adhesively bonded honeycomb sandwich structures in aircraft and other high-reliability lightweight structures.

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