Matrix damage in composite pressure vessels with a bias fiber orientation

Abstract

This study examined carbon/epoxy cylinders with a bias fiber orientation ranging from AE40 to AE60 . The cylinders were pressurized internally and they exhibited a matrix-dominated failure. Coupons with a fiber orientation of 50 or less exhibited a shear failure mode, while coupons with a fiber orientation of 55 or more had a transverse failure mode. The gradual failure process was modeled using a phenomenological approach, where the stiffness degradation was examined in the material coordinate system. Biaxial stress-strain curves were simulated for each fiber angle using Zinoviev damage and Sun plasticity models, extended for biaxial tension. The models were only able to describe the shear response of bias pressure vessels considered here. The experimental results showed slight hardening in shear and significant softening in the transverse direction. Accounting for these post-yield effects significantly improved the correlation with experiment.

Lightweight Type-IV Hydrogen Storage Vessel Boss Based on Optimal Sealing Structure

“…Under the condition of meeting the safety and reliability of Type IV hydrogen storage vessels, the weight of the vessel can be effectively reduced so as to improve the hydrogen storage density and increase the driving range, so a lightweight Type IV hydrogen storage vessel has attracted the attention of researchers. Wang et al [18][19][20] studied the influence of the carbon fiber winding angle on the reinforcement layer thickness of hydrogen storage vessels and determined the optimal winding angle parameter through an optimization algorithm to achieve lightweight effects for hydrogen storage vessels. Ellul et al [21][22][23] studied the effect of the reinforcement layer sequence on the surface deformation and fracture of the hydrogen storage vessel and achieved a strengthening effect by obtaining the global optimal result.…”