Sub-Modelling Boundary Element Approach
For Stress Concentration In Samples Exposed To
Pitting Corrosion
Author(s)
A. Peratta & C. Brebbia
Abstract
The paper presents a Sub-Modelling - Boundary Element Method (BEM) for
computing SCFs in samples exposed to pitting corrosion. The goal of this
technique is to provide a detailed mapping of the stress concentration factor
(SCF) including the effects of deep pits of several microns in a sample of a few
centimetres size, provided that the topographical data of the sample is known in
detail. The methodology is summarised as follows. First, the original geometrical
data representing the top surface of the sample is used for building a hierarchical
sequence of defeatured levels by means of a moving average approach. Second,
an iterative three-dimensional BEM solving scheme is launched in order to
explore and solve the sample data at a defeatured level. The calculation
resolution level can be selected by the user. When the iterative solving scheme
ends, an iterative assembly scheme starts in which the results of SCF and the
geometrical error of the model are collocated at sampling points corresponding
to the resolution selected by the user. Finally, and repeatedly if necessary, a new
solving iteration sequence may be launched with increased resolution, in the
regions of the sample data that require more accuracy, such as zones of high
SCF, large geometrical error, or steep gradient of any of them. The process
continues until convergence of results is achieved. The tool has been
successfully tested in several real case scenarios, and the results obtained
compare well with experimental findings.
Keywords: pitting corrosion, stress concentration, Boundary Element Method,
Sub-Modelling.
Keywords
pitting corrosion, stress concentration, Boundary Element Method,
Sub-Modelling.
Related Book
Other papers in this volume
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