Instantaneous damage kinetic of composite pipes and moisture effect

The damage kinetic of composite pipes and moisture effect is presented. At first, diffusion law and the influence of mechanical damage on absorption are presented. Secondly, the change in the kinetics of the damage is studied for various levels of water content. Mechanical tests, under tension and internal pressure with fixed ends, demonstrate an increase in the rate of damage as a function of water content. The damage rate acceleration is taken into account in a behaviour model. The effect of water content in the material is introduced into this model by using a damage-associated variable depending on the moisture level.