ASTM D7791 Uniaxial Fatigue Properties of Plastics

ASTM D7791 Uniaxial Fatigue Properties of Plastics

ASTM D7791 deals with determining the fatigue characteristics of polymers when they are subjected to uniaxial stress. Plastics that are stiff or semi-rigid can be used in this manner. It employed uniaxial loading systems with tension and compression capabilities. The SI units should be considered as standard.

    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 the 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 end of the cycle is about completing 10⁷cycles.

    Specimen size:

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

    Data:

    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

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