Impact of the Humidity on the Linear Viscoelastic Range of Polyamides during Creep Testing
Within the linear-viscoelastic range (LVE range) of polymers the characteristic viscoelastic functions like the creep modulus are only dependent on time but not on the stress applied to the material. Creep measurements within the LVE range are fundamental for the application of the time-temperature superposition to generate a creep master curve.
Thermoplastic materials are frequently used in constructive applications and for this purpose information on their long-term behavior is of great importance. Since experimental tests for service lives of several decades are usually not feasible the use of accelerated test methods is necessary. Commonly used methods are based on the time-temperature superposition (TTS) which allows shifting of data obtained at specific temperatures to a common reference temperature. Creep measurements within the LVE range are fundamental for the application of the time-temperature superposition to generate a creep master curve. In this report a method to determine the limit of the LVE range of polyamide 6 for static creep tests under different environmental conditions is demonstrated.
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