Keywords :
composite materials, damage, pressure vessels, hydrogen
Abstract :
[en] This paper describes research activities
carried out in the field of Composite Overwrapped
Pressure Vessels (COPV), with the goal to develop
an accurate modelling methodology for the dome
area. Different aspects are considered: material
characterization at coupon level for a structure with
curvatures, and definition of an adapted so called
“soccer-ball mandrel” that presents flat faces;
identification of the parameters of a specific material
model that can account for progressive damage and
permanent deformation; development of a
methodology for modeling with FEM coupons
extracted from the dome area, in shell and 3D-solid
elements formulations; prediction of multi-sequence
lay-up thickness coming from the filament winding
process, in an axisymmetric representation,
accounting for interaction with the boss; FEM
simulation of the filament winding process, in order to
better understand the behavior of the tapes deposited
during filament winding. Good agreements are
obtained between modeling/simulations and
tests/measurements.
