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Rubber, vulcanized - Measurement of fatigue crack growth rate
ISO 27727:2008 specifies a method for the determination of the fatigue crack growth rate of vulcanized rubber under repeated loading over an extended period of time.
The crack starts from the tip of a cut made in the test piece before the test, and grows progressively until it finally becomes large enough for complete fracture to occur.
Using a pure-shear test piece, measurements are made to monitor the crack growth under the cyclic loading in order to obtain the crack growth rate, i.e. the increase in crack length per cycle.
Tests are carried out at various tearing energies by varying the strain energy density in the test piece. This is done by changing the strain amplitude.
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