ASTM D7337 specifies the standard test method for tensile creep rupture of fiber reinforced polymer matrix composite bars, commonly used for tensile reinforcement of prestressed or post-tensioned concrete. ASTM D7337 requires that test specimens are not subjected to dynamic effects, vibration, or torsion during testing. Full load is required to be applied to the specimen over a time range from 20 seconds to 5 minutes. Constant loading at the full prescribed load is then maintained until rupture of the composite test specimen occurs.

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