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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