ASTM D7774 Standard Test Method for Flexural Fatigue Properties of Plastics

ASTM Tests

ASTM D7774 Standard Test Method for Flexural Fatigue Properties of Plastics

EUROLAB laboratory provides testing and compliance services within the scope of ASTM D7774 standard. The ASTM D7774 standard covers the determination of dynamic inverted fatigue properties of plastics in bending. This method can be applied to rigid and semi-rigid plastics. The stress and strain levels are below the proportional limit of the material at which the strains and stresses are relatively elastic.

ASTM D7774 Standard Test Method for Flexural Fatigue Properties of Plastics

Three-point or four-point bending systems are used to determine these properties. This test method can be used with two procedures:

Procedure A: It is designed for materials that use three-point loading systems to determine flexural strength. Three point loading system is used for this process.
Procedure B: It is designed for materials that use four-point loading systems to determine flexural strength. A four-point loading system is used for this process.

These fatigue tests are used to determine the effect of machining, surface condition, stress, and the like on the fatigue resistance of plastic material. It shows bending stress for a relatively large number of cycles. The results can also be used as a guide for the selection of plastic materials for service under repeated bending stress conditions.

Specifications may vary with sample depth and testing frequency. The test frequency can be 1-25 Hz, but it is recommended to use a frequency of 5 Hz or less. The material response at fatigue is not the same for all plastics. If a plastic does not exhibit an elastic region where the strain is reversible, plastic deformation will occur during fatigue testing, causing the programmed load or deformation amplitude to be changed during the test to increase. In this case, care should be taken when using the results for design, as they are often not indicative of the actual fatigue properties of the material.

Rigid or semi-rigid plastic specimens are loaded in three-point (Procedure A) or four-point (Procedure B) bending configurations to determine the effect of machining, surface condition, stress, and the like on the fatigue resistance of the exposed plastic material. to bending stress for many cycles. The results are only suitable for application to the design when the sample test conditions realistically simulate the service conditions. Comparative tests may be performed according to either procedure, provided that the procedure is found to be satisfactory for the material under test.

Values ​​stated in SI units will be accepted as standard. Values ​​in parentheses are for informational purposes only. This standard and ISO 13003 deal with the same topic, but differ in technical content and results cannot be directly compared between the two test methods.

This standard does not purport to address all, if any, safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory restrictions prior to use.

Our organization, EUROLAB, provides standard test method services for the bending fatigue properties of plastics, within the framework of national and international standards, with its trained and expert staff and advanced technological equipment, among numerous test, measurement, analysis and evaluation studies. Provides testing services within the scope of ASTM D7774 standard.

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