Crack detection and retardation of steel structure by smart CFRP embedding PPP-BOTDA fiber sensors

For Brillouin Optical Time Domain Reflectometry (BOTDR) based distributed sensing technique, limited by 1m-order spatial resolution, it is difficult to monitor or test localized deformation, and loop installation of optical fiber sensors is a good countermeasure, In this paper, firstly, the measurement behavior and performance of loop installed optical fiber sensors is investigated experimentally, and the accuracy of BOTDR based distributed fiber optic sensors (DFOS) is evaluated. Furthermore, an experimental investigations on a steel specimen is carried out. Based on the investigations, steel structure damage identification method with no requirement for a structural Numerical Model is proposed.

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Portable Generator to Detect Cracks on Large Steel Structures: An Application of Inductive Thermography

Journal of Nondestructive Evaluation ◽

10.1007/s10921-021-00795-5 ◽

2021 ◽

Vol 40 (3) ◽

Author(s):

Paul Dario Toasa Caiza ◽

Rüdiger Schwendemann ◽

Paola Calero ◽

Thomas Ummenhofer

Keyword(s):

Output Voltage ◽

Crack Detection ◽

Eddy Currents ◽

Lithium Ion ◽

Steel Structure ◽

Steel Structures ◽

Ir Camera ◽

Square Wave ◽

Brittle Behavior ◽

Large Steel

AbstractThe demand of non-destructive methods to detect cracks caused by fatigue or brittle behavior in large steel structures has increased in the last years. Thermography based on electromagnetic induction is a promising method to detect cracks in weld seams and notches. This paper presents a portable experimental setup, which allows to perform in situ crack detection tests on large steel structures. The success of this configuration is based on the use of a highly efficient switched H-Bridge circuit, which can generate a square-wave output voltage with a fundamental frequency up to 100 kHz. Due to the low losses and the low necessary DC-link voltage, the circuit can be supplied by a lithium-ion battery, which allows a small and light setup. The generated square-wave output voltage supplies an air coil resulting in a high frequent triangle current. The induced electromagnetic field caused by the current signal generates eddy currents in the steel structure. Due to an increased current density of the eddy currents in the crack area, there is a measurable temperature increase near the crack. The resulting temperature field is visualized and recorded with an infrared (IR) camera, which shows in real time the occurrence of cracks.

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Strain Measurement and Crack Detection by Optical Fiber Sensors

Journal of the Society of Naval Architects of Japan ◽

10.2534/jjasnaoe1968.1998.399 ◽

1998 ◽

Vol 1998 (183) ◽

pp. 399-405 ◽

Cited By ~ 1

Author(s):

Tetsuo Ishizuka ◽

Masataka Takemura

Keyword(s):

Optical Fiber ◽

Strain Measurement ◽

Crack Detection ◽

Optical Fiber Sensors ◽

Fiber Sensors

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Crack detection and monitoring in viscoelastic solids using polymer optical fiber sensors

Review of Scientific Instruments ◽

10.1063/1.4941747 ◽

2016 ◽

Vol 87 (3) ◽

pp. 035005 ◽

Cited By ~ 4

Author(s):

Tao Chen ◽

Zhihong Li ◽

Xiaochun Song ◽

Yanming Zhou ◽

Haiyan Guo ◽

...

Keyword(s):

Optical Fiber ◽

Crack Detection ◽

Optical Fiber Sensors ◽

Polymer Optical Fiber ◽

Viscoelastic Solids ◽

Fiber Sensors

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Three-Dimensional Ultrasonic Crack Detection in Anisotropic Materials

Research in Nondestructive Evaluation ◽

10.1080/09349849708968121 ◽

1997 ◽

Vol 9 (2) ◽

pp. 59-79 ◽

Cited By ~ 14

Author(s):

J. Mattsson ◽

A. J. Niklasson ◽

A. Eriksson

Keyword(s):

Crack Detection ◽

Three Dimensional ◽

Anisotropic Materials

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Status of nondestructive control of transport function metal products at JSC EVRAZ NTMK

Ferrous Metallurgy Bulletin of Scientific Technical and Economic Information ◽

10.32339/0135-5910-2020-6-586-590 ◽

2020 ◽

Vol 76 (6) ◽

pp. 586-590

Author(s):

S. P. Bersenev ◽

E. M. Slobtsova

Keyword(s):

Crack Detection ◽

Middle Part ◽

Control Line ◽

Magnetic Powder ◽

Nondestructive Control ◽

Automated Control ◽

Ultrasonic Control ◽

Acoustic Contact ◽

In Series

Achievements in the area of automated ultrasonic control of quality of rails, solid-rolled wheels and tyres, wheels magnetic powder crack detection, carried out at JSC EVRAZ NTMK. The 100% nondestructive control is accomplished by automated control in series at two ultrasonic facilities RWI-01 and four facilities УМКК-1 of magnetic powder control, installed into the exit control line in the wheel-tyre shop. Diagram of location, converters displacement and control operations in the process of control at the facility RWI-01 presented, as well as the structural diagram of the facility УМКК-1. The automated ultrasonic control of rough tyres is made in the tyres control line of the wheel-tyre shop at the facility УКБ-1Д. The facility enables to control internal defects of tyres in radial, axis and circular directions of radiation. Possibilities of the facility УКБ-1Д software were shown. Nondestructive control of railway rails is made at two facilities, comprising the automated control line of the rail and structural shop. The УКР-64Э facility of automated ultrasonic rails control is intended to reveal defects in the area of head, web and middle part of rail foot by pulse echo-method with a immersion acoustic contact. The diagram of rail P65 at the facility УКР-64Э control presented. To reveal defects of the macrostructure in the area of rail head and web by mirror-shadow method, an ultrasonic noncontact electromagnetic-acoustic facility is used. It was noted, that implementation of the 100% nondestructive control into the technology of rolled stuff production enabled to increase the quality of products supplied to customers and to increase their competiveness.

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