Hydrogen Barrier Function of Carbon Epoxy in Tank IV

Thread by Rodney Bennet on 19 Feb 2019 at 13:31:09 
Dear All

In case of type IV pressure vessel for Hydrogen storage, does the Hydrogen permeation depend on the HDPE liner only, or does the barrier function of the Carbon reinforced Epoxy also contribute to a reduction in permeation. Reason for asking is that the permeation performance of our HDPE liner seems insufficient to meet the onboard 700 bar regulation at room temperature (hydrogen permeation exceeds 1 ccstp H2 /h /L.

Can CheFEM predict the Hydrogen mass / volume diffusion through a cracked/fracture composite material? Cracks in the composite laminate already appear at low strains, can CheFEM predict the overall permeation, including the flow through such tortuous paths?

Looking forward to hearing from you.

Kind regards,
Rodney