ASTM WK74238

    New Test Method for Peel Resistance of Metal Sheets Joined by High Strength Bonds

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    Developed by Subcommittee: B07.05 | Committee B07 | Contact Staff Manager



    WK74238

    1. Scope

    This test method determines the relative peel resistance of bonds between two flexible adherends. The unbonded tabs of the adherends are clamped to opposing lever-arms that rotate downward to peel the bond-line. The test method was specifically developed for aluminum sheet metal joined by hot isostatic pressing (HIP) where the bond strength can be high enough to prematurely fail the pulling tabs. The test fixture supports the bend radii of the pulling tabs to concentrate the peeling action at the bond line. Even so, tab failure can still occur for very high strength bonds. The test method is being used to determine the sensitivity of bond strength to the time, temperature, and pressure conditions of the HIP cycle. This test method may be used to extend the range of test methods D903, D1876, D1781, D3167, and D3762, and it uses a smaller test specimen than these other tests. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    Keywords

    adhesive, bond, assemblies, cladding, laminates, metal, fracture, energy release rate, hot isostatic pressing, HIP

    Rationale

    Metal-to-metal HIP bonds can be very strong with the peeling bond strength high enough to fail the specimen pulling tabs in some cases. However, the existing ASTM peel test methods work well when the adhesive bond peels apart with forces well below the breaking strength of the specimen tabs. This new peel test method extends the range of peel strength measurements by supporting the bend radii of the pulling tabs to concentrate the peeling action at the bond line. The method applies for low to high bond strengths using a small specimen tested in a standard compression load frame. This method provides a quantitative bond strength measure for: Manufacturers of reactor plate fuels clad in aluminum Providers of Hot Isostatic Pressing services Those applying diffusion bonding methods in manufacturing.

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:
    09-25-2020

    Technical Contact:
    Kenneth Johnson

    Item:
    004

    Ballot:
    B07 (21-03)

    Status:
    In Balloting