ASTM D7791 Uniaxial Fatigue Properties of Plastics

ASTM D7791 deals with determining the fatigue characteristics of polymers when they are subjected to uniaxial stress. Pl astics that are stiff or semi-rigid can be tested through this test method. It employs uniaxial loading systems with tension and compression capabilities. The SI units should be considered as standard.... Read More

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    Scope:

    ASTM D7791 test is used to determine the effect of processing and fatigue resistance of plastic material. The results are used as a guide for the selection of plastic materials for service under repeated flexural stress.

    Test Procedure:

    In ASTM D7791, a specimen of rectangular or circular cross-section is gripped and pulled equally in opposite directions. The specimen is cyclically loaded in tension to a specific stress or strain level until the specimen ruptures. The test ends after completing 10⁷ of such cycles.

    Video 01: Procedure for uniaxial cyclic fatigue test

    Specimen size:

    Test frequency should be between 1-25 Hz, but it is recommended that the frequency should be less than 5 Hz.

    Data:

    In ASTM D7791, the stress level is determined by the following equation.

    Р = σΑ

    where, Р = load in N, σ = stress level in MPa, Α = gauge cross sectional area in mm²

    Conclusion:

    ASTM D7791 test is used to determine the effect of processing and fatigue resistance of plastic material.

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