Norm

ISO/DIS 18437-6:2017 en

Mechanical vibration and shock - Characterization of the dynamic mechanical properties of visco-elastic materials - Part 6: Time-temperature superposition

  • Deze norm is niet direct leverbaar vanuit de NEN-shop.
    Wilt u dit product bestellen neemt u dan contact op met NEN-klantenservice: (015) 2 690 391 of klantenservice@nen.nl

Over deze norm

Status Ontwerp
Aantal pagina's 23
Gepubliceerd op 20-04-2017
Taal Engels
This part of ISO 18437 presents a standard method for the acquisition and analysis of data obtained using the test methods found in standards ISO 18437 Parts1-5 as well as ISO 6721 Parts 4-7 and Part 12. It is applicable to viscoelastic materials which are thermorheologically simple and which were tested at equilibrium state for every temperature. This part of ISO presents a method for checking the validity of a thermorheological simplicity of a material, identifying and eliminating questionable data, and provides minimal criteria for data acquisition to be applied in mathematical methodologies, which allow multiple data sets of dynamic visco-elastic properties measured at different temperatures to be cast into a single master curve according to the time-temperature superposition (TTS) principle. When sufficient data is obtained or available a standard method is defined which uses a closed form shifting algorithm [16, 17]. TTS is the most widely used method for accelerated prediction of long-term visco-elastic behaviour of materials [13]. In the frequency domain TTS may be used for predicting the behaviour of materials at frequencies that are experimentally not assessable. TTS is applied as follows: a series of dynamic mechanical experiments are carried out at different constant temperatures over a given short frame of frequencies, commonly called the experimental window. By doing so a set of isotherm storage modulus segments is obtained. Then these isotherms are firstly shifted vertically and then horizontally along the logarithmic frequency scale towards a segment measured at reference temperature, R T , resulting in a smooth master curve. Thus, one effectively has a measure of material behaviour at broad range of frequencies by applying TTS to isotherms measured within experimentally reasonable frequency frames.

Details

ICS-code 17.160
Nederlandse titel Mechanical vibration and shock - Characterization of the dynamic mechanical properties of visco-elastic materials - Part 6: Time-temperature superposition
Engelse titel Mechanical vibration and shock - Characterization of the dynamic mechanical properties of visco-elastic materials - Part 6: Time-temperature superposition

Winkelwagen

Subtotaal:

Ga naar winkelwagen