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Quantification of a thermal pre‐load on polymer matrix composites by the degradation and colour change of polyurethane top coats
Author(s) -
Eibl S.
Publication year - 2016
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201500514
Subject(s) - polyurethane , composite material , materials science , die (integrated circuit) , analytical chemistry (journal) , chemistry , chromatography , nanotechnology
This work provides techniques to separately determine temperature (90–340 °C) and duration (1 minute to 240 days) of a thermal pre‐load as well as residual strength of polymer matrix composites on basis of the degradation of the top‐coat. Infrared spectroscopy and colorimetry characterizing binder degradation and colour changes of polyurethane top‐coats were used to provide a non‐destructive in‐service method to quantify incipient heat damage. A multivariate (chemometric) analysis of infrared and colorimetric data was performed. The precision of the calculated values for duration and temperature of the thermal pre‐load as well as residual strength for specimen with unknown thermal history is slightly better for the infraredspectroscopic analysis. Deviation of the calculated temperature is less than 10 °C. However, the sole analysis of colorimetric data allows a separate evaluation of these parameters. Limitations of the techniques are identified.