ASTM D7774-12 Flexural Fatigue Properties of Plastics

ASTM D7774-12 Flexural Fatigue Properties of Plastics

ASTM D7774-12 covers the determination of dynamic full reversed fatigue properties of plastics in flexure. This standard test method is applicable to rigid and semi-rigid plastics. The SI units should be considered as standard.


    ASTM D7774-12 is used to determine the effect of processing, surface condition, stress, and fatigue resistance of plastic material subjected to flexural stress for a large number of cycles. According to this test, a frequency of 5Hz or less is used.

    Test Procedure:

    The standard test method D7774 uses a three-point bending fixture and a double-sided loading nose. The dimensions of both sides are identical. The radii of the noses and supports are in accordance with the test method. The fixture has a support span range of 50.8 to 254 mm.

    Specimen size:

    Test frequency can be 1 – 25 Hz, but it is recommended that a frequency of 5 Hz or less should be used.


    The stress level can be determined by the following equation.

    Where; Р = load in N,  S = flexural stress in MPa, L = support span in mm


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