Hydrostatic Response of Submarine Nickel Aluminum Bronze Valves with Corrosion Damage.

摘要

This study was undertaken to numerically investigate the behaviour of the submarine nickel aluminum bronze (NAB) valves (SW403 and SW226) with corrosion damage under hydrostatic loading at Defence R&D Canada Atlantic (DRDC Atlantic), and to validate the numerical models using experimental results. Finite element analysis, involving nonlinear elastic plastic static analysis was performed using the implicit solver in LS-DYNA software system. The experimental testing showed that the smaller SW403 valve generally responded with lower strains than the larger SW226 valve at the same load. In addition, the strains in the body increased with corrosion damage, and were much higher than those in the neck. This was expected since there was no corrosion damage in the neck region, there should be no effect of corrosion damage on the circumferential strain in the neck. The finite element results for the axial strain in the body in general showed reasonably good agreement with the experimental results. However, the circumferential strain in both the body and the neck were in general underestimated. This indicates that further refinement of the finite element mesh is required.