ASTM D950 Test Method for Impact Strength of Adhesive Bonds

    ASTM D950 Introduction

    ASTM D950 is a standard procedure for evaluating the comparative impact strength of adhesive bonds in shear using standard specimens under specific conditions. D950 assesses how adhesives withstand sudden loads, measuring the energy the specimen absorbs upon failure from a single blow.

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    Conditioning involves exposure to specific humidity and temperature levels, typically controlled using a conditioning chamber or desiccators with saturated salt solutions.

    D950 Standard Test Method

    ASTM D950
    Adhesion and attachment of specimen to machineEach D950 test specimen consists of a small adherend block on a larger base block of the same material, bonded with adhesive. The base block is held in a sturdy steel jig bolted to the testing machine’s base, with a screw securing the specimen for testing.
    Striking the specimen with the hammerThe impact head is raised to a set height and released, striking the smaller adherend block at the adhesive bond line. The testing machine should allow direct reading of the impact energy.

    D950 Equipment and Sample Preparation

    Specimen DetailsThe metal-to-metal specimens used in the D950 test are Brass, Copper, Aluminium, Steel, Phosphorous, Bronze, Magnesium, Nickel, and Silver. The Wood-to-Wood specimens in D950 involve hard maple wood. All the specimens used are of specified dimensions and are subjected to specific conditioning environments.
    Specimen DimensionsIn D950 testing, the smaller adherend is a square block with maximum dimensions of 25.4 mm × 25.4 mm × 9.5 mm (1 inch × 1 inch × 3/8 inch). If this size is too large to fracture with the available testing equipment, the dimensions of the top adherend block may be appropriately reduced. The larger adherend block should measure 44.5 mm × 25.4 mm × 19 mm (13/4 inch × 1 inch × 3/4 inch).

    D950 Results and Interpretation

    The D950 testing procedure reports the specimen’s impact strength, which is calculated by dividing the energy absorbed in causing the specimen to fail by its bonded area. This value is expressed in joules per square meter or foot-pound force per square inch.

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    ASTM D950 test procedure is related to other ASTM procedures, including the ASTM A108 test procedure for steel elements, ASTM B16 test procedure for brass rods used in screw machines, ASTM B107 test procedure for magnesium alloy elements, ASTM B133 test procedure for copper elements and ASTM B139 test procedure for phosphor bronze elements.

    Use of D950 in Various Industries

    It is a very important standard in industries such as automotive, aerospace, and construction for product integrity through adhesive bonds. It ensures high-stress components in vehicle assembly, assesses structural bonding in high-stress environments, and assesses adhesives in construction.

    Materials Commonly Tested with D950

    It tests typical materials such as metals, plastics, composites, and wood bonded with adhesives like epoxies, polyurethanes, acrylics, and cyanoacrylate-based adhesives under impact loading conditions. The test assesses adhesive bond performance for real-world applications requiring structural integrity.

    Safety and Best Practices in D950 Testing

    Testing requires calibrated and secure apparatuses, PPE, and careful handling of materials. The operators should wear safety glasses and gloves, and equipment should be regularly maintained and checked for accuracy.

    Importance of D950

    It is an important test method for determining the impact resistance of adhesive bonds, assisting manufacturers in the selection of appropriate adhesives for high mechanical stress applications, especially in the automotive and aerospace industries.

    FAQ

    Where can I get the astm d950 tested?
    You can share your astm d950 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d950 test to various testing techniques.
    Please contact us for a detailed quote for your astm d950 testing needs. Cost incurred to carry out different astm d950 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
    The required number of samples or specimens should comply with the procedure given in the astm d950 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
    The turnaround time for astm d950 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
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