GB/T 35465.4-2020Test method for fatigue properties of polymer matrix composite materials - Part 4: Tension-compression fatigue and compression-compression fatigue (English PDF)

1 Scope

This part of GB/T 35465 specifies the terms, definitions, and principles of the tensile-compression and compression-compression fatigue performance test methods of polymer matrix composites.

Management, test equipment, samples, condition adjustment and test environment, test procedures, test results, data processing and test reports.

This section applies to the tensile-compression fatigue and compression-compression fatigue performance tests of polymer matrix composites under constant amplitude and constant frequency cyclic loading conditions.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.

For undated references, the latest version (including all amendments) applies to this document.

GB/T 5258 Test method for in-plane compression properties of fiber reinforced plastics

GB/T 35465.1 Fatigue performance test methods of polymer matrix composites Part 1.General rules

GB/T 35465.2 Fatigue performance test methods of polymer matrix composites Part 2.Linear or linearized stress life (SN)

And strain life (epsilon-N) fatigue data statistical analysis

3 Terms and definitions

The following terms and definitions defined in GB/T 5258 and GB/T 35465.1 apply to this document.

4 Principle

Under different stress or strain levels, perform stress ratio on the specimen with a constant stress or strain amplitude, stress ratio or strain ratio and frequency

The cyclic loading test with a stress ratio of less than 0 (tension-compression) or greater than 1 (compression-compression) continues until the sample fails, and the test results are analyzed and processed.

Control stress life (SN) or strain life (epsilon-N) curve.

5 Test equipment