Tensile Strength of Adhesives by Means of Bar and Rod Specimens ASTM D2095

Tensile Strength of Adhesives by Means of Bar and Rod Specimens ASTM D2095

The ASTM 2095 test technique is used to determine the relative tensile strength of adhesives using bar-and rod-shaped butt-joined specimens under specific preparation, conditioning, and testing conditions. Tension tests are a good way to find out how strong an adhesive is in terms of tensile strength.

    Scope:

    The ASTM D2095 test technique specifies the use of bar-and rod-shaped butt-joined specimens  to determine the relative tensile strength of adhesives. This test method can be used to evaluate  adhesives using a variety of adherend materials in similar or distinct combinations. Specification  acceptance, service evaluation, manufacturing control, research, and development all may benefit  from tensile strength data. 

    The tests looks at not only the adhesive’s intrinsic strength, but also the bonding technique,  surface cleanliness, the efficacy of surface treatments, surface etchings, adhesive application and  coverage, and the curing cycle. 

    Procedure:

    For ASTM D2905 test, the specimen is loaded into the testing machine using steel dowel pins  and fixtures. The test is carried out at a temperature different than room temperature in a  temperature-controlled test chamber that encloses the fixtures and test specimen in the testing  machine. The load is applied to the specimen at a rate of 17 to 20 MPa/cm2(2400 to 2800 psi) of  bond area per min for speed testing. The testing machine is set to get the foregoing rate of  loading if rate of loading is measured as crosshead motion. At the time of failure, the maximum  load carried by the specimen is recorded. By visual inspection, the percentage cohesion failure,  adhesion failure, contact failure, and adherend failure based on the bond area is calculated and  recorded. 

    Specimen size:

    Bar-and rod-shaped butt-joined specimens are used in the ASTM D2095 test method.

    Data:

    The tensile strength is calculated by dividing the breaking load by the area of the bonded surface.  This result is expressed in megapascals per square centimeter (pounds per square inch).

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