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This edition, published as first issue within the series “Corrosion Atlas”, provides 181 corrosion case studies, collected from 29 contributors.
These Corrosion Atlas Case Studies provide a helpful tool required for engineers in their daily life to quickly determine and solve their equipment's corrosion problems by compact theoretical background and vivid examples. It fulfills the intension of the editors to be “the first centralized collection of case studies containing challenges paired directly with solutions together in one location”.
The purpose of this research is to predict failure of a largely deformed pressure vessel. The employed Gurson-Tvergaard-Needleman (GTN) model enables a failure prediction through its in-built damage evolution law. A critical damage threshold defines the limit state of the evolution. Here, crack initiation is seen as the limit. Unfortunately, the GTN model does not capture void volume growth under shear stress and shows thermodynamic inconsistencies under pressure. To overcome these drawbacks and to make the model applicable to a wide range of complex stress states, a user-defined subroutine of the GTN model with an extension of its damage evolution law has been developed. The routine also accounts for large deformation which is advantageous for ductile vessel materials. The wall of a pressurised vessel is subjected to multi-axial stress states. Features, such as anges and valves, lead to even more complex stress states. The subroutine is used to determine the burst pressure and the location of failure. This research compares the results of the conventional and the modified GTN model with results of experimentally conducted burst tests. The conclusion of this research is that there is a clear improvement in failure prediction by using the modified GTN model.