ASTM D7774 Flexural Fatigue Properties of Plastics

ASTM D7774 Flexural Fatigue Properties of Plastics

ASTM D7774 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.

    Scope:

    ASTM D7774 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 ASTM 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.

    Video 01: ASTM D7774 Flexural fatigue bend fixture for plastic testing

    Specimen size:

    Test frequency can be 1 – 25 Hz, but it is recommended that a frequency of 5 Hz or less should be used for ASTM D7774 testing.

    Data:

    For ASTM D7774 testing, 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

    Conclusion:

    ASTM D7774 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. 

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