scholarly journals Surface Rust Detection Using Ultrasonic Waves in a Cylindrical Geometry by Finite Element Simulation

2018 ◽  
Vol 3 (3) ◽  
pp. 29 ◽  
Author(s):  
Qixiang Tang ◽  
Cong Du ◽  
Jie Hu ◽  
Xingwei Wang ◽  
Tzuyang Yu
Keyword(s):  
Finite Element ◽  
Early Stage ◽  
Steel Corrosion ◽  
Steel Structures ◽  
Potential Method ◽  
Ultrasonic Waves ◽  
Steel Plates ◽  
Fiber Optic Sensor ◽  
Surface Corrosion ◽  
Steel Members

Detection of early-stage corrosion on slender steel members is crucial for preventing buckling failures of steel structures. An active photoacoustic fiber optic sensor (FOS) system is reported herein for the early-stage steel corrosion detection of steel plates and rebars using surface ultrasonic waves. The objective of this study is to investigate a potential method for detecting surface corrosion/rust of steel rods using numerically simulated surface ultrasonic waves. The finite element method (FEM) was applied in the simulation of propagating ultrasonic waves on steel rod models. The pitch-catch mode of damage detection was adopted, in which one source (transmitter) and one sensor (receiver) were considered. In this research, radial displacements at the receiver were simulated and analyzed by short-time Fourier transform (STFT) for detecting, locating, and quantifying surface rust located between the transmitter and the receiver. From our time domain and frequency domain analyses, it was found that the presence, location, and dimensions (length, width, and depth) of surface rust can be estimated by ultrasonic wave propagation.

scholarly journals Surface Rust Detection Using Ultrasonic Waves in a Cylindrical Geometry by Finite Element Simulation

2018 ◽  
Author(s):  
Qixiang Tang ◽  
Cong Du ◽  
Jie Hu ◽  
Xingwei Wang ◽  
Tzuyang Yu
Keyword(s):  
Finite Element ◽  
Early Stage ◽  
Steel Corrosion ◽  
Steel Structures ◽  
Ultrasonic Waves ◽  
Steel Plates ◽  
Surface Corrosion ◽  
Steel Members ◽  
Length Width ◽  
Simulated Surface

Detection of early stage corrosion on slender steel members is crucial for preventing buckling failures of steel structures. An active photoacoustic fiber optic sensors (FOS) system has been reported for early stage steel corrosion detection of steel plates and rebars using surface ultrasonic waves. The objective of this paper is to investigate the surface corrosion/rust detection problem on steel rods using numerically simulated surface ultrasonic waves. The finite element method (FEM) is applied in simulating the propagation of ultrasonic waves on steel rod models. Transmission mode of damage detection is adopted, in which one source (transmitter) and one sensor (receiver) are considered. In this research, radial displacements at the receiver were simulated and analyzed by short-time Fourier transform (STFT) for detecting, locating, and quantifying a surface rust located between the transmitter and the receiver. From our time domain and frequency domain analyses, it is found that the presence, location, and dimensions (length, width, and depth) of surface rust can be estimated by ultrasonic waves propagating through the surface rust.

scholarly journals Detection and Location of Surface Damage Using Third-Order Combined Harmonic Waves Generated by Non-Collinear Ultrasonic Waves Mixing

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6027
Author(s):  
Weibin Li ◽  
Tianze Shi ◽  
Xiaoxu Qin ◽  
Mingxi Deng
Keyword(s):  
Harmonic Generation ◽  
Nonlinear Response ◽  
Structural Integrity ◽  
Early Stage ◽  
Surface Damage ◽  
Ultrasonic Waves ◽  
Nonlinear Frequency ◽  
Third Order ◽  
Experimental Procedure ◽  
Surface Corrosion

Metals which are widely used in many types of industries are usually subjected to fatigue and surface corrosion. There is a demand to detect the surface damage caused by fatigue and corrosion at an early stage to ensure the structural integrity. In this paper, a novel nonlinear ultrasonic technique based on the measure of third-order combined harmonic generation, is proposed to detect and locate the surface damage in 6061 aluminum alloy. Third-order combined harmonic generation caused by non-collinear mixing of one longitudinal wave and one transverse wave at different frequencies, is firstly analyzed and experimentally observed. An experimental procedure of nonlinear scanning is proposed for the damage detection and location by checking the variation of frequency nonlinear response. The correlations of nonlinear frequency mixing responses and surface damage in the specimens are obtained. Results show that the nonlinear response caused by fatigue damage and surface corrosion can be identified and located by this method. In addition, this approach can exclude the nonlinearity induced by the instruments and simplify the signal processing.

scholarly journals Evaluation of Tensile Performance of Steel Members by Analysis of Corroded Steel Surface Using Deep Learning

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1259 ◽  
Author(s):  
Pang-jo Chun ◽  
Tatsuro Yamane ◽  
Shota Izumi ◽  
Toshihiro Kameda
Keyword(s):  
Deep Learning ◽  
Domain Knowledge ◽  
Steel Structures ◽  
Shell Element ◽  
Effective Thickness ◽  
Steel Plates ◽  
Structural Members ◽  
Steel Members ◽  
High Level ◽  
The Cost

To conduct safety checks of corroded steel structures and formulate appropriate maintenance strategies, the residual strength of steel structural members must be assessed with high accuracy. Finite element method (FEM) analyses that precisely recreate the morphology of corroded surfaces using solid elements are expected to accurately assess the strength; however, the cost of conducting these calculations is extremely high. Therefore, a model that uses mean thickness as the thickness of the shell element is widely used but this method has precision issues, particularly regarding overestimation of risk. Thus, this study proposes a method of structural analysis in which the effective thickness of a shell element is assessed using the convolutional neural network (CNN), a type of deep learning performed on tensile structural members. An FEM model is then built based on the shell element that uses this effective thickness. We cross-validated this method by adding a feature extraction layer that reflects the domain knowledge, together with convolutional and pooling layers that are commonly used for CNN and found that a high level of accuracy could be achieved. Furthermore, regarding corroded steel plates and H-section steel, our method demonstrated results that were extremely close to those of models that used solid elements.

Case Study to Evaluate Stresses in Welded Endplates in Structural Steel

2021 ◽  
Author(s):  
Kshitij P. Gawande ◽  
Alex Mayes ◽  
Raju Subedi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Steel Structures ◽  
Element Model ◽  
Tube Steel ◽  
Element Analysis ◽  
Building Frames ◽  
Steel Members ◽  
Welded Connection

Abstract Endplates are widely used in the industry to attach supplementary steel structures to main building frames. These endplates can be attached to the building steel using a bolted connection or a welded connection. Industry often favors bolted connections due to ease of installation and availability of qualification methods per AISC 360 Design Guides. However, there are some applications where a welded connection is preferable, such as, cases requiring reduction of number of parts supplied or applications with higher chance of vibration causing loosening of bolts. The present case study discusses evaluation of stresses in welded endplates due to forces and moments from the attaching supplementary steel members. The study considers various welded connection scenarios including an endplate welded on two opposite sides and an endplate welded on all four sides. The stress distribution in the plate is studied using finite element analysis with wide flange and tube steel members attaching to it. ANSYS mechanical is used to perform the finite element analysis. Multiple combinations of plate sizes, weld patterns, and attaching member sizes are analyzed to provide a well-rounded solution. An analytical model is developed for the stress evaluation as well and the results are compared with the finite element model. The study is intended to provide an efficient methodology for plate evaluation and qualification.

Influence of Size and Proximity of Paint Coating Defects on Corrosion Behavior of Carbon Steel Plates

2015 ◽  
Vol 665 ◽  
pp. 125-128 ◽  
Author(s):  
Shigenobu Kainuma ◽  
Young Soo Jeong ◽  
Junji Kobayashi
Keyword(s):  
Corrosion Behavior ◽  
Salt Water ◽  
Steel Structures ◽  
Steel Plates ◽  
Coated Steel ◽  
Wetting And Drying ◽  
Single Defect ◽  
Steel Members ◽  
Water Wetting ◽  
Circular Defect

To ensure the safety of painted steel structures, it is important to evaluate the influence of the size and proximity of coating defects on corrosion behavior. In this research, accelerated exposure tests were carried out using combined corrosion cycles, which consisted of exposure to atomizing salt water, wetting, and drying with hot and warm wind. The test specimens were paint-coated steel plates with individual circular machined coating defects 1, 3, 10, and 15 mm in diameter. Multi-circular defects 1 mm in diameter were also created in the specimens. The test results indicate that the mean and maximum corrosion depths increased with increasing diameter of the single defect of the coated steel plate. When actual coated steel members are exposed to corrosive chloride environments such as those represented by the corrosion cycle testing conducted in this research, the corrosion depth for multi-circular defects 1 mm in diameter appears to be 1.5 to 2.5 times greater than that for a single-circular defect.

Finite element investigation on plate buckling coefficients of tapered steel members web plates

Structures ◽  
2020 ◽  
Vol 28 ◽  
pp. 2321-2334
Author(s):  
Mostafa Mohamed Ibrahim ◽  
Ihab Mohamed El Aghoury ◽  
Sherif Abdel-Basset Ibrahim
Keyword(s):  
Finite Element ◽  
Plate Buckling ◽  
Steel Members ◽  
Web Plates

scholarly journals Investigations on arc brazing for galvanized heavy steel plates in steel and shipbuilding

2021 ◽  
Author(s):  
Philipp Andreazza ◽  
Andreas Gericke ◽  
Knuth-Michael Henkel
Keyword(s):  
Low Cost ◽  
Thin Sheet ◽  
Steel Structures ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Steel Plates ◽  
Galvanized Steel ◽  
Filler Materials ◽  
Static Tensile ◽  
Brazed Joints

AbstractArc brazing with low-melting copper-based filler materials, which has long been established and standardized in the thin sheet sector, offers numerous advantages in the processing of predominantly electrolytically galvanized steel structures. In steel and shipbuilding, on the other hand, equipment parts made of thick steel sheets are hot-dip galvanized at low cost and with good corrosion-inhibiting properties. Quality welding of such constructions is not possible without special precautions such as removing the zinc layer and subsequent recoating. With regard to greater plate thicknesses, arc brazing was analyzed in these investigations as an alternative joining method with regard to its suitability for practical use. Within the scope of the investigations, CuSi3Mn, CuMn12Ni2, and four different aluminum bronzes were examined on different sheet surface conditions with regard to the geometrical and production parameters. This was carried out by build-up and connection brazing, executed as butt and cross joints. Quasi-static tensile tests and fatigue tests were used to assess the strength behavior. In addition, metallographic analyses are carried out as well as hardness tests. The suitability for multi-layer brazing and the tendency to distortion were also investigated, as well as the behavior of arc brazed joints under corrosive conditions.

Structure-Soil Interaction of Buried Corrugated Steel Arch Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 2112-2117
Author(s):  
Miao Xin Zhang ◽  
Bao Dong Liu ◽  
Peng Fei Li ◽  
Zhi Mao Feng
Keyword(s):  
Finite Element ◽  
Steel Structures ◽  
Internal Force ◽  
Structural Deformation ◽  
Fe Model ◽  
Soil Pressure ◽  
Load Range ◽  
Finite Element Program ◽  
Load Conditions ◽  
Peak Value

Corrugated steel plate and surrounding soils are working together to share the load in buried corrugated steel structures. It is complicated to consider the structure-soil interaction, so the finite element method has already become the chief means of complicated structure analysis. Based on a practical project, considering structure-soil interaction, by using the finite element program of ANSYS, the paper set up a 2-D FE model and analyzed the soil pressure, the structural deformation and the internal force under different load conditions in detail. The analysis shows that structure-soil interaction has brought about stresses redistribution of surrounding soils, and adverse effects of soil pressure and displacement were limited. The variation range of soil pressure on the crown of arch increases with the load increases and the peak value of soil pressure approach to the code value and a rebound appears in the vehicle load range. The tendencies of vertical soil displacement are nearly the same to different load conditions, and the peak value of moments has an obvious change and can be influenced greatly by deflective load.

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