ASTM D1002, Adhesively Bonded Metal Specimens, Lap Shear Strength
The strength of adhesive bonds depends greatly on the conditions under which the bonding process is carried out. Therefore, variations in this process lead to variations in the accuracy of the results acquired from strength tests of these bonds. It is the responsibility of the manufacturer to prepare samples in accordance with the ASTM standard.
The ASTM standard specifies that “the testing machine shall conform to the requirements of Practices E 4.” For this test, we used the 5569 electromechanical test frame, with a 50 kN load cell and 30 kN capacity mechanical wedge action grips with coarse serrated faces. The standard further specifies that “the long axis of the test specimen coincide with the direction of applied pull through the center line of the grip assembly.” In order to ensure that the load be applied in exactly the same direction as the center line, we inserted spacers into the grips. Ideally the spacers would be bonded to, or machined into, the specimen.
Instron's new Precision Series Manual Wedge Grips provide accurate, repeatable, reliable gripping for alignment-sensitive tensile testing applications, such as those governed by Nadcap maximum bending requirements. Capacities are 100 kN (22,000 lbf) and 250 kN (56,000 lbf) , and these grips can also be used for testing in compression with the proper adapters, and in temperatures ranging from -80 ⁰C (-112 ⁰F) to +250 ⁰C (+482⁰ F).
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5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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The strength of adhesive bonds depends greatly upon the conditions under which the bonding process is carried out and the testing for which is described in ASTM D 1002, Lap Shear Strength of Adhesively Bonded Metal Specimens. This report demonstrates the capabilities of the Instron test frame and software for testing in accorandance to this standard.
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