Isolation Of Thermal And Strain Responses In Composites Using Embedded Fiber Bragg Grating Temperature Sensors

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Isolation of Thermal and Strain Responses in Composites Using Embedded Fiber Bragg Grating Temperature Sensors

Author : Kyle Aspie Elam
Publisher :
ISBN 13 :
Total Pages : 33 pages
Book Rating : 4.:/5 (881 download)

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Book Synopsis Isolation of Thermal and Strain Responses in Composites Using Embedded Fiber Bragg Grating Temperature Sensors by : Kyle Aspie Elam

Download or read book Isolation of Thermal and Strain Responses in Composites Using Embedded Fiber Bragg Grating Temperature Sensors written by Kyle Aspie Elam and published by . This book was released on 2013 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research, fiber Bragg grating (FBG) optical temperature sensors are used for structural health monitoring of composite materials. The specific goal is to detect the thermal response of a composite to high energy radiation incident on the surface of a composite structure. FBG sensors also respond to axial strain in the optical fiber, thus any structural strain experienced by the composite is also detected. Consequently, this research has focused both on identifying the unique characteristics of each response and on developing feasible methods to isolate the thermal response from the strain response. Isolation ensures that any response to mechanical strain does not mask the response to a temperature gradient present on the composite surface. The isolation strategy developed in this research is characterized by two design features. First, a three-dimensional array of FBG temperature sensors has been embedded in a carbon/epoxy composite structure, consisting of both in-plane and through-thickness sensor arrays. This architectural design component exploits the spatial differences between the temperature profile and the strain profile in a composite structure. Second, an accompanying data processing scheme has been developed that uses the statistical properties of the collected sensor data to interpret and identify each response. The degree to which the isolation strategy increases the functionality of FBG temperature sensors in mechanically strained composite structures is assessed.

Damage Assessment in Composites using Fiber Bragg Grating Sensors

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis Damage Assessment in Composites using Fiber Bragg Grating Sensors by :

Download or read book Damage Assessment in Composites using Fiber Bragg Grating Sensors written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation develops a methodology to assess damage in composites using fiber Bragg grating (FBG) strain sensors. First, a strain-transfer model using the finite element (FE) method is developed to simulate the response of an embedded FBG to the applied loading. This FE model is also able to calculate birefringence in the FBG due to applied transverse loads. The model is validated considering the two-dimensional problem of diametrical compression of polarization-maintaining fibers. A modified T-matrix model is then formulated to simulate the response of an embedded FBG due to an applied axial strain field. The response of FBGs surface mounted on PMMA and two-dimensional woven composites subjected to multiple low velocity impacts is experimentally investigated. The complex spectral response is related to the residual strains after impact in the PMMA specimens and the surface strain to failure in the two-dimensional woven composites. The feasibility of using FBGs to measure internal strain in woven composites during damage progression is finally considered.

Strain Transfer Analysis of Embedded Fiber Bragg Grating Strain Sensor

Author : Jun Li
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Strain Transfer Analysis of Embedded Fiber Bragg Grating Strain Sensor by : Jun Li

Download or read book Strain Transfer Analysis of Embedded Fiber Bragg Grating Strain Sensor written by Jun Li and published by . This book was released on 2015 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the difference in the physical and mechanical properties between the optical fiber, protective layer, adhesive layer, and the host material, the strains measured by a fiber Bragg grating (FBG) sensor may not be the actual strains of the host material, which impedes the reliable applications of FBG sensors. To overcome this problem, in this paper, the strain transfer formula was derived by using elastic analysis, the shear-lag method, and several reasonable assumptions taking into account temperature variations and nonaxial stresses, which was an improvement to an existing study (Li, H. N., Zhou, G. D., Ren, L., and Li, D. S., "Strain Transfer Analysis of Embedded Fiber Bragg Grating Sensor Under Nonaxial Stress," Optic. Eng., Volume 46, No. 5, 2007, 054402). The analytical results were validated by simulating the behavior of a bare optical fiber through finite element analysis. The data enabled the identification of the parameters that influence the strain transfer from the host material to the embedded FBG sensors and the impact of the temperature variation and sensor alignment angle on the measurement accuracy. This work provided additional knowledge for the improvement of the existing strain transfer theory of FBG sensors in order to achieve a more accurate strain measurement with this sensing technology.

Application of a Fiber Optic Distributed Strain Sensor System to Woven E-glass Composite

Author : Robert F. Anastasi
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Application of a Fiber Optic Distributed Strain Sensor System to Woven E-glass Composite by : Robert F. Anastasi

Download or read book Application of a Fiber Optic Distributed Strain Sensor System to Woven E-glass Composite written by Robert F. Anastasi and published by . This book was released on 2001 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A distributed strain sensing system utilizing a series of identically written Bragg gratings along an optical fiber is examined for potential application to Composite Armored Vehicle health monitoring. A vacuum assisted resin transfer molding process was used to fabricate a woven fabric E-glass/composite panel with an embedded fiber optic strain sensor. Test samples machined from the panel were mechanically tested in 4-point bending. Experimental results are presented that show the mechanical strain from foil strain gages comparing well to optical strain from the embedded sensors. Also, it was found that the distributed strain along the sample lenght was consistent with the loading configuration.

Measurement of Process-induced Strains in Composite Materials Using Embedded Fiber Optic Sensors

Author :
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (683 download)

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Book Synopsis Measurement of Process-induced Strains in Composite Materials Using Embedded Fiber Optic Sensors by :

Download or read book Measurement of Process-induced Strains in Composite Materials Using Embedded Fiber Optic Sensors written by and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the results of experiments to measure the internal strains and temperatures that are generated in graphite/epoxy composite specimens during processing using embedded fiber optic strain sensors and thermocouples. Measurements of strain and temperature, combined with a computational model, offer the potential for non-destructive, real-time determination of residual stress in composites, and may be useful for process monitoring and control. Extrinsic Fabry-Perot interferometer, Bragg grating strain sensors, and thermocouples were embedded in graphite/epoxy composite laminates prior to cure. The specimens were cured in a press, and the internal strains and temperatures developed during processing were monitored and recorded. The results are compared with expected values, and limitations of the experimental technique are discussed.

A Technology Assessment of Bragg Grating Fiber Optic Based Nondestructive Evaluation (NDE)

Author : H. Thomas Yolken
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis A Technology Assessment of Bragg Grating Fiber Optic Based Nondestructive Evaluation (NDE) by : H. Thomas Yolken

Download or read book A Technology Assessment of Bragg Grating Fiber Optic Based Nondestructive Evaluation (NDE) written by H. Thomas Yolken and published by . This book was released on 2001 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 836 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Composites and Their Applications

Author : Ning Hu
Publisher : IntechOpen
ISBN 13 : 9789535107064
Total Pages : 440 pages
Book Rating : 4.1/5 (7 download)

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Book Synopsis Composites and Their Applications by : Ning Hu

Download or read book Composites and Their Applications written by Ning Hu and published by IntechOpen. This book was released on 2012-08-22 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composites are a class of material, which receives much attention not only because it is on the cutting edge of active material research fields due to appearance of many new types of composites, e.g., nanocomposites and bio-medical composites, but also because there are a great deal of promise for its potential applications in various industries ranging from aerospace to construction due to its various outstanding properties. This book mainly describes some potential applications and the related properties of various composites by focusing on the following several topics: health or integrity monitoring techniques of composites structures, bio-medical composites and their applications in dental or tissue materials, natural fiber or mineral filler reinforced composites and their property characterization, catalysts composites and their applications, and some other potential applications of fibers or composites as sensors, etc. This book has been divided into five sections to cover the above contents.

Structural Health Monitoring Damage Detection Systems for Aerospace

Author : Markus G. R. Sause
Publisher : Springer Nature
ISBN 13 : 3030721922
Total Pages : 292 pages
Book Rating : 4.0/5 (37 download)

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Book Synopsis Structural Health Monitoring Damage Detection Systems for Aerospace by : Markus G. R. Sause

Download or read book Structural Health Monitoring Damage Detection Systems for Aerospace written by Markus G. R. Sause and published by Springer Nature. This book was released on 2021 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book presents established methods of structural health monitoring (SHM) and discusses their technological merit in the current aerospace environment. While the aerospace industry aims for weight reduction to improve fuel efficiency, reduce environmental impact, and to decrease maintenance time and operating costs, aircraft structures are often designed and built heavier than required in order to accommodate unpredictable failure. A way to overcome this approach is the use of SHM systems to detect the presence of defects. This book covers all major contemporary aerospace-relevant SHM methods, from the basics of each method to the various defect types that SHM is required to detect to discussion of signal processing developments alongside considerations of aerospace safety requirements. It will be of interest to professionals in industry and academic researchers alike, as well as engineering students. This article/publication is based upon work from COST Action CA18203 (ODIN - http://odin-cost.com/), supported by COST (European Cooperation in Science and Technology). COST (European Cooperation in Science and Technology) is a funding agency for research and innovation networks. Our Actions help connect research initiatives across Europe and enable scientists to grow their ideas by sharing them with their peers. This boosts their research, career and innovation.

Expanding the Vision of Sensor Materials

Author : Committee on New Sensor Technologies: Materials and Applications
Publisher : National Academies Press
ISBN 13 : 0309587433
Total Pages : 146 pages
Book Rating : 4.3/5 (95 download)

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Book Synopsis Expanding the Vision of Sensor Materials by : Committee on New Sensor Technologies: Materials and Applications

Download or read book Expanding the Vision of Sensor Materials written by Committee on New Sensor Technologies: Materials and Applications and published by National Academies Press. This book was released on 1995-07-06 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in materials science and engineering have paved the way for the development of new and more capable sensors. Drawing upon case studies from manufacturing and structural monitoring and involving chemical and long wave-length infrared sensors, this book suggests an approach that frames the relevant technical issues in such a way as to expedite the consideration of new and novel sensor materials. It enables a multidisciplinary approach for identifying opportunities and making realistic assessments of technical risk and could be used to guide relevant research and development in sensor technologies.

Damage Monitoring in Woven Composites Using Fiber-Bragg Grating Sensors on Multiple Time Scales

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis Damage Monitoring in Woven Composites Using Fiber-Bragg Grating Sensors on Multiple Time Scales by :

Download or read book Damage Monitoring in Woven Composites Using Fiber-Bragg Grating Sensors on Multiple Time Scales written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study investigates the application of Fiber Bragg Grating (FBG) optical sensors interrogation techniques over several time scales to monitor damage in composite structures due to low velocity impacts events. Optical fiber sensors are embedded into carbon fiber/epoxy resin woven composites using a single-step cure process. The composite specimens are subjected to multiple low energy impacts until failure. Impact events are characterized by acceleration and position sensors integral to the impactor head. The embedded FBG sensors are interrogated using three different interrogation techniques. Low speed, full spectrum measurements are recorded using a tunable laser source. High speed, peak wavelength detection data is taken using a commercial peak wavelength interrogation system. Finally, high speed full spectrum measurements are recorded using new instrumentation developed at Brigham Young University. By qualitatively examining the responses of these three techniques and comparing the FBG data with impact characterization data, a more complete picture of the composite health is available.

Structural Health Monitoring of Civil Infrastructure Systems

Author : Vistasp M. Karbhari
Publisher : Elsevier
ISBN 13 : 1845696824
Total Pages : 553 pages
Book Rating : 4.8/5 (456 download)

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Book Synopsis Structural Health Monitoring of Civil Infrastructure Systems by : Vistasp M. Karbhari

Download or read book Structural Health Monitoring of Civil Infrastructure Systems written by Vistasp M. Karbhari and published by Elsevier. This book was released on 2009-08-25 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural health monitoring is an extremely important methodology in evaluating the ‘health’ of a structure by assessing the level of deterioration and remaining service life of civil infrastructure systems. This book reviews key developments in research, technologies and applications in this area of civil engineering. It discusses ways of obtaining and analysing data, sensor technologies and methods of sensing changes in structural performance characteristics. It also discusses data transmission and the application of both individual technologies and entire systems to bridges and buildings. With its distinguished editors and international team of contributors, Structural health monitoring of civil infrastructure systems is a valuable reference for students in civil and structural engineering programs as well as those studying sensors, data analysis and transmission at universities. It will also be an important source for practicing civil engineers and designers, engineers and researchers developing sensors, network systems and methods of data transmission and analysis, policy makers, inspectors and those responsible for the safety and service life of civil infrastructure. Reviews key developments in research, technologies and applications Discusses systems used to obtain and analyse data and sensor technologies Assesses methods of sensing changes in structural performance

Fibre Optic Methods for Structural Health Monitoring

Author : Branko Glisic
Publisher : John Wiley & Sons
ISBN 13 : 9780470517802
Total Pages : 276 pages
Book Rating : 4.5/5 (178 download)

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Book Synopsis Fibre Optic Methods for Structural Health Monitoring by : Branko Glisic

Download or read book Fibre Optic Methods for Structural Health Monitoring written by Branko Glisic and published by John Wiley & Sons. This book was released on 2008-03-11 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of fibre optic sensors in structural health monitoring has rapidly accelerated in recent years. By embedding fibre optic sensors in structures (e.g. buildings, bridges and pipelines) it is possible to obtain real time data on structural changes such as stress or strain. Engineers use monitoring data to detect deviations from a structure’s original design performance in order to optimise the operation, repair and maintenance of a structure over time. Fibre Optic Methods for Structural Health Monitoring is organised as a step-by-step guide to implementing a monitoring system and includes examples of common structures and their most-frequently monitored parameters. This book: presents a universal method for static structural health monitoring, using a technique with proven effectiveness in hundreds of applications worldwide; discusses a variety of different structures including buildings, bridges, dams, tunnels and pipelines; features case studies which describe common problems and offer solutions to those problems; provides advice on establishing mechanical parameters to monitor (including deformations, rotations and displacements) and on placing sensors to achieve monitoring objectives; identifies methods for interpreting data according to construction material and shows how to apply numerical concepts and formulae to data in order to inform decision making. Fibre Optic Methods for Structural Health Monitoring is an invaluable reference for practising engineers in the fields of civil, structural and geotechnical engineering. It will also be of interest to academics and undergraduate/graduate students studying civil and structural engineering.

Efficient Simulation of Bragg Grating Sensors for Implementation to Structural Health Monitoring of Composites

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis Efficient Simulation of Bragg Grating Sensors for Implementation to Structural Health Monitoring of Composites by :

Download or read book Efficient Simulation of Bragg Grating Sensors for Implementation to Structural Health Monitoring of Composites written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of a structural health monitoring system is to detect, locate, and identify damages in a structure during its lifetime. The concept of structural health monitoring is particularly important for fiber reinforced composites due to the complexity of the possible failure mechanisms. The goal of this thesis is to simulate the response of optical fiber Bragg grating sensors to multi-component loading for their implementation in structural health monitoring algorithms for composites. A simulation method is presented to determine the effects of axial, bending and shear loading on an embedded optical fiber Bragg grating sensor. The effect of fiber bending on the Bragg grating sensor is experimentally verified by embedding the sensor in a solid cone, clamped at the base and subjected to a point load at the apex. Next, a numerically efficient method to calculate the response of sensors embedded in a unidirectional composite is developed using both finite element analysis and optimal shear-lag theory and taking into account the above effects. The limitations of the optimal shear-lag theory are derived through comparison with the finite element results. The application of this method is demonstrated through a numerical example, simulating the response of sensors embedded in one fiber layer to a transverse crack. This work is a first step towards the development of embedded sensors for fiber-reinforced composites that are "self evaluating."

Fiber Bragg Gratings

Author : Andreas Othonos
Publisher : Artech House Publishers
ISBN 13 :
Total Pages : 448 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Fiber Bragg Gratings by : Andreas Othonos

Download or read book Fiber Bragg Gratings written by Andreas Othonos and published by Artech House Publishers. This book was released on 1999 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber Bragg gratings are flexible, cost-effective and highly efficient, with a vast range of potential applications. This timely new work provides a comprehensive description of the principles and practical applications of this latest technology, which has the potential to revolutionize telecommunications and significantly impact optical fiber sensing. Here the authors explain the underlying physics and practical aspects in a clear and unambiguous manner.

Curing Monitoring of Composite Material Using Embedded Fiber Bragg Grating Sensors

Author : Chia-Chin Chiang
Publisher :
ISBN 13 : 9789533074498
Total Pages : pages
Book Rating : 4.0/5 (744 download)

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Book Synopsis Curing Monitoring of Composite Material Using Embedded Fiber Bragg Grating Sensors by : Chia-Chin Chiang

Download or read book Curing Monitoring of Composite Material Using Embedded Fiber Bragg Grating Sensors written by Chia-Chin Chiang and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fiber Bragg Grating Sensors: Recent Advancements, Industrial Applications and Market Exploitation

Author : Andrea Cusano
Publisher : Bentham Science Publishers
ISBN 13 : 160805084X
Total Pages : 331 pages
Book Rating : 4.6/5 (8 download)

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Book Synopsis Fiber Bragg Grating Sensors: Recent Advancements, Industrial Applications and Market Exploitation by : Andrea Cusano

Download or read book Fiber Bragg Grating Sensors: Recent Advancements, Industrial Applications and Market Exploitation written by Andrea Cusano and published by Bentham Science Publishers. This book was released on 2011 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is an exciting source of information for individuals interested in learning about and marketing sensors. The book focuses on scientific and commercial advances in Fiber Bragg Grating (FBG) sensor technology since its discovery over 30 years ago.