Download or read book Study of Fatigue Cracks in Steel Bridge Components Using Acoustic Emissions written by Roy D. Fultineer and published by . This book was released on 1997 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Emission Monitoring of Fatigue Cracks in Steel Bridge Structures written by Jay McKeefry and published by . This book was released on 1999 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents results from a laboratory study and field implementation of acoustic emission monitoring or fatigue cracks in cover-plated steel bridge girders. The acoustic monitoring successfully detected growing fatigue cracks in the lab when using both source location and a state of stress criteria. Application of this methodology on 3 field bridges also proved successful by detecting a propagating crack in 2 of the bridges and an extinguished crack in a third bridge.
Download or read book Acoustic Emission Assessment of Steel Bridge Details Subjected to Fatigue written by Navid Nemati and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic Emission (AE) fatigue crack monitoring has the potential to provide early fatigue crack detection and assessment required to develop a rational prognostics methodology and can provide insight to assess the integrity of structures such as bridges. Most steel structures develop fatigue cracks at the transverse weld toe of stiffeners, attachments, and cover plates. The cracks develop from a combination of initial conditions (e.g. weld toe geometry, discontinuities, residual stress fields) that are difficult to accurately quantify, thus rendering fracture mechanics models for the prediction of fatigue crack growth exceedingly difficult without experimental verification. Single edge notches provide a very well defined load and fatigue crack size and shape environment for estimation of the stress intensity factor K, which is not found in welded structures. ASTM SE(T) specimens do not appear to provide ideal boundary conditions for proper recording of acoustic wave propagation and crack growth behavior observed in the field, but do provide standard fatigue crack growth rate data. A modified version of the SE(T) specimen has been examined to provide small scale specimens with improved AE characteristics while still maintaining accuracy of fatigue crack growth rate da/dN versus stress intensity factor [delta]K. The configuration of the modified SE(T) specimen maintains the similitude with the orientation of crack propagation in flanges of steel bridge members. Testing of small scale single edge notch tension specimens is considered to assess load ratio (R ratio) and initial crack size effects on fatigue life of specimens. Fatigue tests are conducted at various R ratios to investigate the effect of load ratio on acoustic emission data. Stress Intensity Factor (SIF) models are extended to include expressions for crack tip opening displacement measured experimentally with a clip gauge. Correlation between fatigue crack growth, stress intensity factor and AE data is developed. Analytical and numerical studies of stress intensity factor are developed for single edge notch test specimens consistent with the experimental program. ABAQUS finite element software is utilized for stress analysis of crack tips. Cruciform specimens consisting of a single tension pull plate with transverse fillet welded plates attached at midspan are tested. The transverse plates represent stiffeners and/or short attachments typical of steel bridge details. The specimen provides realistic initial conditions of fatigue crack initiation and growth from high stress concentration regions. Realistic AE waveform characteristics representative of those expected on bridge structures is produced. Accurate stress intensity factor values are more difficult to obtain due to the small, non-uniform crack growth conditions at the weld toe. Additional Finite Element Models for welded geometries capturing stress fields at the weld toe of stiffeners and attachment details is performed to examine crack depth, limited base plate thickness and weld toe angle effects on the relationship between stress intensity factor K and crack size, a. Numerical results are incorporated into an existing analytical stress intensity factor framework to minimize required computational costs. As a result, the validity of Acoustic Emission (AE) as a parameter to assess, monitor and predict the structural health of infrastructure was verified. A methodology to combine AE data and loading data with fracture models was developed to identify and evaluate existing condition (size and shape) and predict future behavior of fatigue cracks on a structure subject to well defined detail types. This will provide the ability to do prognostic using AE and will allow the prediction for the remaining life of the member based on the AE data.
Download or read book Acoustic Emission Monitoring of Fatigue Cracks on the Fast Steel Bridge written by A. Shakoor Uppal and published by . This book was released on 2005 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Emission Monitoring of Fatigue Cracks in Steel Bridge Girders written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rail Crack Monitoring Using Acoustic Emission Technique written by Dan Li and published by Springer. This book was released on 2018-06-23 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis provides an innovative strategy for rail crack monitoring using the acoustic emission (AE) technique. The field study presented is a significant improvement on laboratory studies in the literature in terms of complex rail profile and crack conditions as well as high operational noise. AE waves induced by crack propagation, crack closure, wheel-rail impact and operational noise were obtained through a series of laboratory and field tests, and analyzed by wavelet transform (WT) and synchrosqueezed wavelet transform (SWT). A wavelet power-based index and the enhanced SWT scalogram were sequentially proposed to classify AE waves induced by different mechanisms according to their energy distributions in the time–frequency domain. A novel crack sizing method taking advantage of crack closure-induced AE waves was developed based on fatigue tests in the laboratory. The propagation characteristics of AE waves in the rail were investigated, and Tsallis synchrosqueezed wavelet entropy (TSWE) with time was finally brought forward to detect and locate rail cracks in the field. The proposed strategy for detection, location and sizing of rail cracks helps to ensure the safe and smooth operation of the railway system. This thesis is of interest to graduate students, researchers and practitioners in the area of structural health monitoring.
Download or read book Qualitative and Quantitative Assessments Using Acoustic Emission on Fatigue Crack Growth in Steel Bridges written by Benjamin Bradford Wild and published by . This book was released on 1998 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Materials Technology written by Paul E. Hartbower and published by CRC Press. This book was released on 2020-08-23 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of papers presented in the NDT Conference held on February 20-23, 1996 at San Diego, California. The conference provided an opportunity to share experience and provide additional input to the Federal Highway Administration.
Download or read book Acoustic Emission Characterization of Fatigue Crack Growth in Highway Bridge Components written by Alireza Ghorbanpoor and published by . This book was released on 1985 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantitative Acoustic Emission Monitoring of Fatigue Cracks in Fracture Critical Steel Bridges written by Thomas Schumacher (Engineer) and published by . This book was released on 2014 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Acoustic Emission Technology written by Gongtian Shen and published by Springer. This book was released on 2017-05-19 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume collects the papers from the World Conference on Acoustic Emission 2015 (WCAE-2015) in Hawaii. The latest research and applications of Acoustic Emission (AE) are explored, with particular emphasis on detecting and processing of AE signals, development of AE instrument and testing standards, AE of materials, engineering structures and systems, including the processing of collected data and analytical techniques as well as experimental case studies.
Download or read book Modelling Simulation and Data Analysis in Acoustical Problems written by Claudio Guarnaccia and published by MDPI. This book was released on 2020-06-23 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling and simulation in acoustics is currently gaining importance. In fact, with the development and improvement of innovative computational techniques and with the growing need for predictive models, an impressive boost has been observed in several research and application areas, such as noise control, indoor acoustics, and industrial applications. This led us to the proposal of a special issue about “Modelling, Simulation and Data Analysis in Acoustical Problems”, as we believe in the importance of these topics in modern acoustics’ studies. In total, 81 papers were submitted and 33 of them were published, with an acceptance rate of 37.5%. According to the number of papers submitted, it can be affirmed that this is a trending topic in the scientific and academic community and this special issue will try to provide a future reference for the research that will be developed in coming years.
Download or read book Fatigue Crack Growth Detection Along A36 Steel Using Acoustic Emission Technique written by Calvin Larod Jones and published by . This book was released on 2008 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigates the monitoring and detecting of crack growth in A36 bridge steel using a new homemade piezoelectric (PZT) sensor. Compares the acoustic emissions (AE) results from attaching conventional sensors and bonded sensors to a steel specimen and putting them under fatigue loading to detect the AE from the crack emission. Completes a finite element simulation to verify the waveform that was produced to the experimental waveform of the bonded sensor.
Download or read book Bridge Maintenance Safety Management Resilience and Sustainability written by Fabio Biondini and published by CRC Press. This book was released on 2012-06-21 with total page 4119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge Maintenance, Safety, Management, Resilience and Sustainability contains the lectures and papers presented at The Sixth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2012), held in Stresa, Lake Maggiore, Italy, 8-12 July, 2012. This volume consists of a book of extended abstracts (800 pp) Extensive collection of revised expert papers on recent advances in bridge maintenance, safety, management and life-cycle performance, representing a major contribution to the knowledge base of all areas of the field.
Download or read book Fatigue and Fracture in Steel Bridges written by John W. Fisher and published by Wiley-Interscience. This book was released on 1984-06-20 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a detailed review and summary of twenty-two case studies of fracture and fatigue in bridge structures. Its two parts cover cracks formed as a result of low fatigue resistant details, and cracks resulting from unanticipated secondary or displacement induced stresses.
Download or read book Acoustic Emission written by Wojciech Sikorski and published by BoD – Books on Demand. This book was released on 2012-03-02 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic emission (AE) is one of the most important non-destructive testing (NDT) methods for materials, constructions and machines. Acoustic emission is defined as the transient elastic energy that is spontaneously released when materials undergo deformation, fracture, or both. This interdisciplinary book consists of 17 chapters, which widely discuss the most important applications of AE method as machinery and civil structures condition assessment, fatigue and fracture materials research, detection of material defects and deformations, diagnostics of cutting tools and machine cutting process, monitoring of stress and ageing in materials, research, chemical reactions and phase transitions research, and earthquake prediction.
Download or read book Journal of Acoustic Emission written by and published by . This book was released on 1999 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
