ASTM D1002, ASTM D5868, ASTM D3163 for Lap Shear Tests

ASTM D1002, ASTM D5868, ASTM D3163 for Lap Shear Tests

Lap-Joint Test of Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-Metal) ASTM D1002. Lap Shear Adhesion Test for Fibre Reinforced Plastics (FRP) ASTM D5868. Lap Shear Strength Test of Adhesively Bonded Plastics ASTM D3163.

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    Scope:

    Lap Shear value determined by ASTM D1002, ASTM D3163, ASTM D5868 is useful in ascertaining the shear strength of adhesives for bonding materials such as metals, plastics when tested on a standard single-lap-joint specimen. A sliding failure that happens along a flat surface is termed as shear.

    This test is used to determine adhesive strengths, surface preparation criteria, comparative shear strength data, and adhesive environment durability. ASTM single-lap-joint shear testing covers ASTM D1002 that specifies the apparent shear strength for bonding metals, ASTM D3163 for rigid plastic adherends, and ASTM D5868 for fibre-reinforced plastic (FRP) adherends.

    Test Procedure:

    For ASTM D1002, ASTM D3163, ASTM D5868 tests, each end of the sample is loaded in the tensile grips. A force is adjusted at a fixed rate to the sample until it fractures and the maximum force and the kind of joint failure are recorded. The test procedures for three different ASTM are: (a) ASTM D1002 specifies a load control rate of 1,200 to 1,400 psi/minute. A crosshead control rate of 0.05 inch/minute approximates the loading rate and also is an acceptable mode of control; (b) Two samples are bonded along with an adhesive and cured as needed for ASTM D3163 for rigid, adhesively bonded plastic. The test samples are put in a universal test machine and pulled up to failure at a speed of 1.3 mm/min; and (c) ASTM D5868 recommends a loading rate of 13 mm/min (0.5 in/min) for fibre reinforced plastic.

    Sample Size:

    Two samples are bonded along with the adhesive, each with 25.4 x 101.6 mm (1 inch4 inches) such that the overlap is enough to cause the adhesive to malfunction and not the substrate. The common overlaps are 12.7 mm and 25.4 mm (0.5 inch and 1 inch). Adhesives are applied following the adhesive manufacturer’s suggestions. 

    Data:

    Maximum, minimum, and average failure load values

    Failing Stress in megapascals (pounds-force per square inch)

    Different type of failure (cohesive, adhesive, or substrate)

    Conclusion:

    ASTM D1002 is a standard test method determining adhesive lap joint shear testing of metals and ASTM D3163 is a lap shear strength test of adhesively bonded plastics while  ASTM D5868 is lap shear adhesion test for fibre reinforced plastics (FRP). 

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