scholarly journals Simulation of the Ill-Posed Problem of Reinforced Concrete Corrosion Detection Using Boundary Element Method

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Syarizal Fonna ◽  
Israr M. Ibrahim ◽  
M. Ridha ◽  
Syifaul Huzni ◽  
A. K. Ariffin
Keyword(s):  
Reinforced Concrete ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Electrical Potential ◽  
Concrete Surface ◽  
Corrosion Detection ◽  
Concrete Corrosion ◽  
Ill Posed ◽  
Reinforced Concrete Corrosion ◽  
Element Method

Many studies have suggested that the corrosion detection of reinforced concrete (RC) based on electrical potential on concrete surface was an ill-posed problem, and thus it may present an inaccurate interpretation of corrosion. However, it is difficult to prove the ill-posed problem of the RC corrosion detection by experiment. One promising technique is using a numerical method. The objective of this study is to simulate the ill-posed problem of RC corrosion detection based on electrical potential on a concrete surface using the Boundary Element Method (BEM). BEM simulates electrical potential within a concrete domain. In order to simulate the electrical potential, the domain is assumed to be governed by Laplace’s equation. The boundary conditions for the corrosion area and the noncorrosion area of rebar were selected from its polarization curve. A rectangular reinforced concrete model with a single rebar was chosen to be simulated using BEM. The numerical simulation results using BEM showed that the same electrical potential distribution on the concrete surface could be generated from different combinations of parameters. Corresponding to such a phenomenon, this problem can be categorized as an ill-posed problem since it has many solutions. Therefore, BEM successfully simulates the ill-posed problem of reinforced concrete corrosion detection.

The Influence of Anode Profiles for Three Dimensions Numerical Simulation of Reinforced Concrete Corrosion Using Boundary Element Method

2013 ◽  
Vol 686 ◽  
pp. 261-265 ◽  
Author(s):  
M. Ihsan ◽  
Syarizal Fonna ◽  
M. Ridha ◽  
Syifaul Huzni ◽  
A.K. Arrifin
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Polarization Curves ◽  
Laplace's Equation ◽  
Concrete Corrosion ◽  
Corrosion Simulation ◽  
Reinforced Concrete Corrosion ◽  
Element Method

The corrosion of structures is needed to be identified early to prevent any severe damage of buildings. The conventional technique such as potential mapping for diagnosing of reinforced concrete corrosion has been used widely in the field. However, the method has limitation such as less accuracy, laborious and time-consuming. This study is conducted to develop boundary element method 3 dimensions by considering polarization curves of anode and cathode for corrosion simulation and analyzed the influences of anode profiles for RC corrosion simulation. In this method, the potential in concrete domain was modeled by Laplace’s equation. The anode and cathode areas were represented by each polarization curves. The numerical simulation result shows that the boundary element method 3 dimensions successfully solved the Laplace’s equation in order to simulate corrosion phenomenon of reinforced concrete. The influences of anode profiles for RC corrosion simulation have been analyzed. Further works are needed to reduce the computational effort of corrosion simulation.

scholarly journals EFFECT OF CONDUCTIVITY IN CORROSION PROBLEM USING BOUNDARY ELEMENT METHOD AND GENETIC ALGORITHM

2020 ◽  
Vol 1 (01) ◽  
pp. 58-63
Author(s):  
Mohammed Aldlemy
Keyword(s):  
Genetic Algorithm ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Potential Distribution ◽  
Electrical Potential ◽  
Matlab Program ◽  
Electrolyte Surface ◽  
Corrosion Problem ◽  
Indirect Analysis ◽  
Element Method

Boundary element method applications with inverse solution are used to apply the indirect analysis for modeling of corrosion problem. Laplace equation has been used to model the electrical potential in the electrolyte surface. In this paper a computer modeling has been developed to visualize the effect of conductivity value in corrosion problem. Genetic algorithm is used to create the conductivity value based on the mechanics of natural selection and genetics. The boundary element method is then calculating the potential value of the whole domain. FORTRAN and MATLAB program have been developed to calculate and visualize the potential distribution in the domain. Two-dimensional example problems are analyzed to demonstrate the application of the proposed boundary element modeling procedure.

Inverse Identification of Heat Boundary Conditions for 2-D Anisotropic Coating Structures

2011 ◽  
Vol 130-134 ◽  
pp. 1825-1828
Author(s):  
Huan Lin Zhou ◽  
Hu Sha Han ◽  
Chang Zheng Cheng ◽  
Zhong Rong Niu
Keyword(s):  
Boundary Element Method ◽  
Singular Value Decomposition ◽  
Boundary Conditions ◽  
Boundary Element ◽  
Singular Integrals ◽  
Singular Value ◽  
Thin Body ◽  
Ill Posed ◽  
Value Decomposition ◽  
Element Method

The singular value decomposition is employed to identify heat boundary conditions for 2-D anisotropic coating structures. The boundary element method is applied to analyzing the model. The nearly singular integrals in the boundary element method for thin body problems are dealt with by the analytical integral formulas. The ill-posed system is treated by the truncated singular value decomposition technique. Numerical example demonstrates the effectiveness and accuracy of the present algorithm.

A Study on Holographic Reconstruction of Cyclostationary Sound Field Based on Boundary Element Method

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
H. B. Zhang ◽  
Q. Wan ◽  
W. K. Jiang ◽  
C. J. Liao
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Modulation Frequency ◽  
Sound Field ◽  
Special Kind ◽  
Frequency Component ◽  
Vibrational Signal ◽  
Spectral Density Functions ◽  
Ill Posed ◽  
Element Method

The cyclostationary vibrational signal modulated by other signals can be considered as a special kind of nonstationary signal, which is found frequently in some rotating machinery. The modulation frequency component can be extracted from the total signal using second-order cyclic statistics at the appropriate cyclic frequency. By using the cyclic spectral density functions instead of power spectrum or spectrum as the variables, the cyclostationary nearfield acoustic holography (CYNAH) technique is used to reconstruct acoustic physical quantities in the cyclostationary sound field. In this presented work the CYNAH method is combined with the boundary element method (BEM) to overcome the limitations on the geometries of the planar CYNAH method. The methods used in the conventional BEM-based NAH to overcome nonuniqueness and the ill-posed nature should be also implemented here. The results of a simulation show satisfactory agreement between the computed values and the analytical ones.

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