Abstract
The mechanical behavior of steel employed in the hull of a steel tank damaged by corrosion has been analyzed. The tank was used to filter a deep-water well for an 8-year period. Influence of porosity and dissolution of material may be introduced in the main constitutive relation adding a new damage variable C, which describes electrochemical damage. An elastoplastic theoretical model coupled to damage of a member, and other for damage related to thermodynamic energy are developed. This theoretical development has been used to analyze mechanical behavior of steel used in the body of a steel tank damaged by corrosion in water purifier plants, Eastern System, Mexico City, where three of every ten filters show excessive corrosion inside the steel plate filtration tanks. With samples taken from steel of the tank’s hull and reinforcement of false bottom supporting filtering material inside the tank, metallography tests were carried out; localized and generalized types of corrosion were determined, as well as the type of corrosion composites generated due to anticorrosive coating used inside the tank from its manufacturing.
Highlights
In presence of high magnitude overloads, structures show damage symptoms, characterized by degradation of elastoplastic properties
Yield strength σσyy determined for A284 Grade C steel in the reference probe, was 295 MPa (3000 kg/cm2), very close to the theoretical 290 MPa (2950 kg/cm2) value
It can be considered that A284 Grade C steel underwent a 19.5% yield strength loss
Summary
In presence of high magnitude overloads, structures show damage symptoms, characterized by degradation of elastoplastic properties. The structure, as in an uniaxial assay, goes through an elastic phase modeled by elastic behavior laws and, through a plastic phase with hardening (modeled by the elastoplastic behavior with hardening laws). Many of the first experimental works on slow-action sand filters were carried out at the Lawrence experimental station, Sanity Board, Massachusetts State, USA, which started to operate in November, 1887, and was under supervision of Allen Hazen from summer, 1888, throughout March 1893 [3]. In 1957, Hosner picked up Graham and Rodríguez’ approach and proposed an analysis procedure based on a simple mass-spring model. Seismic analysis of storage tanks is based on such methodology
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