Journal of Materials Science

, Volume 22, Issue 1, pp 46–56 | Cite as

The hygrothermal behaviour of glass fibre reinforced Pa66 composites: A study of the effect of water absorption on their mechanical properties

  • D. Valentin
  • F. Paray
  • B. Guetta


A kinetic study of water absorption in three types of thermoplastic materials has been undertaken: pure Pa66 polymer, short fibre and continuous fibre composites. Ageing tests were carried out under nine sets of hygrothermal conditions: three different temperatures 40, 70, 90°C and three relative humidity levels, namely 30, 75 and 100% r.h. The results were found to obey a Fickian diffusion model and the characteristic parametersD (diffusion coefficient) andMm% (maximum moisture content percentage) were determined. The influence of water uptake on residual mechanical properties was studied using three-point bending tests. For each type of composite, a water concentration threshold was detected beyond which a significant reduction in mechanical properties was observed.


Fibre Composite Short Fibre Ageing Test Humidity Level Content Percentage 
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Copyright information

© Chapman and Hall Ltd. 1987

Authors and Affiliations

  • D. Valentin
    • 1
  • F. Paray
    • 1
  • B. Guetta
    • 1
  1. 1.Ecole Nationale Supérieure des Mines de ParisCentre des MatériauxEvry CédexFrance

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