Applied Sciences Webinar | Steel Health Monitoring and Rehabilitation
the chair
13th Webinar of Applied Sciences
Steel Health Monitoring and Rehabilitation
A method and the corresponding instruments, able to provide surface and bulk residual stress, as well as plastic deformation distribution monitoring in ferromagnetic steels and their welds, has been developed. The method is based on the correlation of the classic reference methods of stress tensor distribution determination and monitoring on the surface and the bulk of steels, namely X-ray Bragg–Brentano diffraction (XRD-BB) and neutron diffraction (ND), respectively, with the corresponding surface or bulk magnetic permeability and magnetostriction, resulting in reference magnetic stress calibration curves (MASC) for each different type of steel. The normalization of all different MASCs with respect to the corresponding yield point and maximum permeability, respectively, resulted in a universal law of dependence of stresses on magnetic properties concerning residual stresses, thus facilitating in determining the MASC of an unknown type of steel, only by a stress–strain characterization together with in situ magnetic permeability measurement. The mentioned uncertainty and speed of measurement for surface and bulk stress measurements have been verified for 17 out of the 42 different types of steel involved in the most interesting steel applications. The stress monitoring methods are also accompanied by localized stress rehabilitation, using localized induction heating probes. The system is accompanied by the proper software code, advancing the stress monitoring and rehabilitation method into an automated stress testing and rehabilitation system, meeting the needs for modern and advanced steel production and manufacturing.
Meet the Event Chair
Meet Our Speakers
Prof. Aphrodite Ktena
National and Kapodistrian University of Athens;
Aphrodite Ktena is a Professor at the National & Kapodistrian University of Athens, Greece. She holds a B.Sc. degree in Electrical Engineering (1989, suma cum laude, University of Bridgeport, USA) and MSc / PhD degrees in Electrical and Computer Engineering (1993, Carnegie Mellon University, USA). Her research interests include hysteresis and magnetic materials modeling and characterization, sensor development and measurement technology, system modeling and optimization as well as RES and smart grid technologies. She has a long-standing collaboration with the Sensors Laboratory at the National Technical University of Athens on magnetic non-destructive testing methods for steels. Has published over 100 papers in international journals and conference proceedings, is an editor in IEEE Transactions on Magnetics, Magnetism and Metals, a reviewer for over 30 journals and has coordinated several EU and nationally funded projects. A member of the Technical Chamber of Greece, IEEE, and CIGRE.
Dr. Spyridon Angelopoulos
Laboratory of Electronic Sensors, National Technical University of Athens, Athens, Greece;
Spyridon Angelopoulos is a member of the Laboratory of Electronic Sensors of the National Technical University of Athens (NTUA), Greece. He holds a PhD from the School of Electrical and Computer Engineering of the NTUA. In 2012, he received his Bachelor Diploma of Engineer in Applied Mathematical and Physical Sciences from the School of Applied Mathematical and Physical Sciences of the NTUA, having specialized in the fields “Optoelectronics & Laser” and “Advanced Technological Materials”. In 2014, he received his MSc Degree in Automation Systems from the School of Mechanical Engineering of the NTUA, having specialized in the field of “Automatic Control and Robotics”. In 2019, he completed his PhD Thesis entitled “Design and development of magnetic sensors and their characterization devices, based on magnetic effects”. He has published 29 articles in scientific journals, he has given more than 35 conference presentations and he is the author of a book about sensors and microcontrollers. His research interests include the design and development of sensors and devices, as well as the required electronics and software.
Sponsors and Partners
Organizer
In this webinar, a steel health monitoring and rehabilitation methodology is proposed. First, the correlation between residual stresses and magnetic properties in ferromagnetic steels is provided. The result of such a correlation is the monotonic dependence of residual stresses on the differential permeability, leading to the determination of magnetic stress calibration (MASC) curves. The normalization of stresses and differential permeability with the yield point of stress and maximum permeability, respectively, for each type of steel results in the collapse of all MASCs in one, following a universality law. This unique normalized MASC curve allows for the determination of the MASC in an unknown type of ferromagnetic steel following a simple stress–strain curve together with permeability measurement. Such permeability measurements can be realized with two low-energy consumption sensors, based on the Hall effect and the anisotropic magnetoresistance (AMR) effect. The Hall effect arrangement can be used for single- or multi-axis sensors, while the AMR sensor can be used for three-axis measurements at a given point. The measurement of the stress gradient along the length of the steel can determine the position and the time for the generation of cracks. Furthermore, localized RF induction heating may annihilate such a gradient, thus allowing for the avoidance of crack initiation. This technology can be used by steel producers and manufacturers, as well as by steel end-users and inspectors, and can be applied for standardization.
State-of-the-Art in Structural Steel Engineering
Edited by Algirdas Juozapaitis and Alfonsas Daniūnas
Deadline for manuscript submissions: 1 November 2023
Edited by Ricardo Branco, Filippo Berto and Joel De Jesus
Deadline for manuscript submissions: 25 November 2023
Advances in Bridge Design and Structural Performance
Edited by Zhongxiang Liu and Tong Guo
Deadline for manuscript submissions: 31 March 2024
“Sensor to Monitor Localized Stresses on Steel Surfaces Using the Magnetostrictive Delay Line Technique”
by Kaiming Liang, Spyridon Angelopoulos, Georgios Lepipas, Panagiotis Tsarabaris, Aphrodite Ktena, Xiaofang Bi and Evangelos Hristoforou
Sensors 2019, 19(21), 4797; https://doi.org/10.3390/s19214797
“Magnetic Residual Stress Monitoring Technique for Ferromagnetic Steels”
by Polyxeni Vourna, Aphrodite Ktena, Panagiotis Tsarabaris and Evangelos Hristoforou
Metals 2018, 8(8), 592; https://doi.org/10.3390/met8080592
Available online: https://www.mdpi.com/2075-4701/8/8/592
“Residual Stress Distribution Monitoring and Rehabilitation in Ferromagnetic Steel Rods”
by Kaiming Liang, Spyridon Angelopoulos, Aphrodite Ktena, Xiaofang Bi and Evangelos Hristoforou
Sensors 2022, 22(4), 1491; https://doi.org/10.3390/s22041491
“Smart Stress Annihilation in Steels Using Residual Stress Distribution Monitoring and Localized Induction Heating”
by Kaiming Liang, Panagiotis Tsarabaris, Aphrodite Ktena, Xiaofang Bi and Evangelos Hristoforou
Metals 2020, 10(6), 838; https://doi.org/10.3390/met10060838
Novel Approaches for Structural Health Monitoring
Edited by Cecilia Surace
Novel Approaches for Structural Health Monitoring II
Edited by Cecilia Surace