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ASTM D1781 Peeling Test for Climbing Drum Method for Adhesives

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


ASTM D1781 test method covers the determination of the peel resistance of adhesive bonds between: a relatively flexible adherend and a rigid adherend; and the relatively flexible facing of a sandwich structure and its core, when tested under specified conditions.


Keywords

Adhesives - Bond Strength - Climbing Drum Peel Test - Peel Resistance - Peel Test - Sandwich Structures

Peeling Apparatus, consisting of a flanged drum, flexible loading straps or cables, and suitable clamps for holding the test specimen.


The climbing drum peel fixture with sample is mounted in the test frame of universal testing machine. Apply a tensile load at a constant rate of crosshead separation and determine the average peeling load between 1in and 6in of adherend separation. The corresponding amount of crosshead movement is dependent on the geometry of the climbing drum peel fixture.

Calculate and report the average peel torque. To ensure compliance, please read read the entire ASTM D1781 test specification prior to testing.


Calculations:

Average Peeling Load

Average Peel Torque


What is the ASTM D1781 climbing drum test?

What is standard of ASTM D1781?

ASTM D1781 evaluates the peel resistance of adhesive bonds between relatively flexible facing and rigid adherends and between sandwich structure facings and cores. This standard ensures the quality and reliability of adhesive bonds in various applications, from aerospace components to consumer products. 


But what exactly does this test involve?

ASTM D1781 measures the peel resistance of adhesives, a key indicator of their performance. For example, higher peel resistance in brittle adhesive might signal an incomplete cure. Manufacturers use this information to ensure their adhesives meet quality standards and perform as expected.

Performing this test requires specific equipment: a climbing drum peel fixture and a universal testing machine. These tools apply the necessary pulling force, ensuring controlled test conditions. The fixture holds the specimen while the universal testing machine applies a consistent load, enabling accurate peel resistance measurement using a test method for climbing.


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.


ASTM D1781 Peeling Test for Climbing Drum Method for Adhesives

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


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.

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