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Author : Xianghua Jian
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (343 download)
Download or read book Damage Detection in Composite Materials Using Piezoelectric Elements written by Xianghua Jian and published by . This book was released on 1995 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John E. Masters
Publisher : ASTM International
ISBN 13 : 0803114745
Total Pages : 280 pages
Book Rating : 4.8/5 (31 download)
Download or read book Damage Detection in Composite Materials written by John E. Masters and published by ASTM International. This book was released on 1992 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of 16 papers from an international symposium in San Antonio, November 1990, focusing on the necessary coordination between materials scientists, stress analysts, and non-destructive evaluation specialists, for successfully designing, building, certifying, and maintaining composite struc
Author : Abu Saeed Islam
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (115 download)
Download or read book Damage Detection and Mitigation of Composite Structures Using Piezoelectric Materials written by Abu Saeed Islam and published by . This book was released on 1995 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Seth Stovack Kessler
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (512 download)
Download or read book Piezoelectric-based In-situ Damage Detection of Composite Materials for Structural Health Monitoring Systems written by Seth Stovack Kessler and published by . This book was released on 2002 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) These techniques have proven suitable for structural health monitoring applications since they can be applied with low power conformable sensors and can provide useful information about the state of a structure during operation. Piezoelectric patches could also be used as multipurpose sensors to test using a variety of methods such as modal analysis, Lamb wave, acoustic emission and strain based methods simultaneously by altering driving frequencies and sampling rates. Guidelines and recommendations drawn from this research are presented to assist in the design of a structural health monitoring system for a vehicle, and provides a detailed example of a SHM system architecture. These systems will be an important component in future designs of air and spacecraft to increase the feasibility of their missions.
Author : M H Ferri Aliabadi
Publisher : World Scientific
ISBN 13 : 1786343940
Total Pages : 286 pages
Book Rating : 4.7/5 (863 download)
Download or read book Structural Health Monitoring For Advanced Composite Structures written by M H Ferri Aliabadi and published by World Scientific. This book was released on 2017-12-18 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural health monitoring (SHM) is a relatively new and alternative way of non-destructive inspection (NDI). It is the process of implementing a damage detection and characterization strategy for composite structures. The basis of SHM is the application of permanent fixed sensors on a structure, combined with minimum manual intervention to monitor its structural integrity. These sensors detect changes to the material and/or geometric properties of a structural system, including changes to the boundary conditions and system connectivity, which adversely affect the system's performance.This book's primary focus is on the diagnostics element of SHM, namely damage detection in composite structures. The techniques covered include the use of Piezoelectric transducers for active and passive Ultrasonics guided waves and electromechanical impedance measurements, and fiber optic sensors for strain sensing. It also includes numerical modeling of wave propagation in composite structures. Contributed chapters written by leading researchers in the field describe each of these techniques, making it a key text for researchers and NDI practitioners as well as postgraduate students in a number of specialties including materials, aerospace, mechanical and computational engineering.
Author : Michelle DuBose Spiegel
Publisher :
ISBN 13 :
Total Pages : 39 pages
Book Rating : 4.:/5 (895 download)
Download or read book Damage Detection in Composite Materials Using PZT Actuators and Sensors for Structural Health Monitoring written by Michelle DuBose Spiegel and published by . This book was released on 2014 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural Health Monitoring (SHM) of bridges, buildings, aircrafts, and spacecraft using a network of sensors has gained popularity over recent years. In this thesis, the use of piezoelectric actuators and sensors is described for detecting damage in a composite panel. The composite panels are fabricated using the Vacuum Assisted Resin Transfer Molding (VARTM) process. The panels are cut into small coupons (254 mm x 25.4 mm) to test various properties of the composite. A piezoelectric actuator is surface mounted on the composite coupon to generate Lamb waves while a surface mounted piezoelectric sensor measures the response. Data is collected from an undamaged composite coupon, and then the process is repeated for a damaged coupon. The existing damage is quantified by comparing the response of the damaged and undamaged composite coupons.
Author : J. Bennett
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (227 download)
Download or read book A Preliminary Study on Damage Detection Using Piezoelectric Film written by J. Bennett and published by . This book was released on 1991 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Damage detection in metallic and composite structural components is of particular importance in the damage tolerant assessment and the maintenance of aircraft structures. This report describes the use of piezoelectric film for sensing damage in a number of structural components. Three specimens were evaluated, viz.: (1) A rivetted lap joint; (2) A surface crack in an aluminium alloy; (3) An impact damaged composite laminate. The lap joint was chosen to be representative of a fuselage lap joint in modern, wide bodied aircraft. The joint contained multi-site damage repaired with a bonded doubler. Piezoelectric film was applied to the doubler and the underlying damage was detected. The second specimen was a conventional aluminum alloy with surface flaws emanating from a fastener hole. The last specimen was a graphite epoxy composite laminate with impact damage at two locations, i.e. multiple damages sites.
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (455 download)
Download or read book Damage Detection in Thick-Walled Composites Using Surface Mounted Piezoelectric Elements written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of the Phase 1 SBIR project described in this report was to develop a free vibration method for nondestructive evaluation of thick-walled composites. The governing principle of the free vibration method is that the frequency spectrum generated by a given object has the specificity of a fingerprint. Accordingly, if the boundary conditions, material properties, or geometry of the object are changed, some or all of the natural frequencies will change. Dramatic shifts have been observed in the natural vibrational frequencies of thin composite plates with the introduction of delaminations or other interply modifications; these observations provided the motivation for the present project in which the method was extended to thick plates. In our version of the free vibration method, the composite is excited into vibration by a single mechanical pulse and the vibrational behavior is monitored by removable surface- bonded piezoelectric polymer film elements. When bonded to the surface of the composite, the piezoelectric film acts like a strain gage, except that it requires no external power source and generates signals far greater than those of a traditional amplified strain gage. The great sensitivity of the piezoelectric polymer film sensors and the simplicity of the overall test configuration makes this version of the method attractive for in-plant or in-field nondestructive evaluation.
Author : Sazid Irfan Ahmed
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book Damage Detection in Textile Composites Via Piezoelectric Admittance Methods written by Sazid Irfan Ahmed and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural health monitoring of aerospace structures is becoming vital as lightweight composite materials are increasingly used in aero-structures. Composites have various types of failure modes, which make it even more important to identify fault or damage compared to isotropic materials. Therefore, on-site health monitoring is one of the most preferred methodologies for detecting internal crack or damage at its initial stage to enhance operating safety and reduce repair cost. Recently, piezoelectric transducers are on high demand for on-site health monitoring because of its high bandwidth sensitivity. They simultaneously perform as actuators and sensors and embedded in the structure for real time response indicative of the condition of the structure. Their characteristics show direct coupling between the electrical impedance and structural impedance. The electrical impedance or admittance changes according to modification in mass, stiffness or damping properties of the host body to which the transducer is attached. In this study, plain-weave textile composites are utilized to demonstrate the capability of piezoelectric transducer. The elastic properties of the composite are determined using the fiber tow properties that are derived via the Concentric Cylinder Assemblage micromechanics model. Finite element modeling is done in commercial software ANSYS APDL to observe electrical admittance variation around natural frequency of the entire structure to investigate structure condition. Delamination was studied at first but results show very small shift in frequency of the same mode number for healthy and defective structures along with same magnitude of admittance. This makes delamination detection via impedance approach not feasible. So, investigation was shifted to detection of intra-ply damage. Damage can be thought of as reduction of stiffness in the whole structure. Fair amount of shift in the modal frequency was observed with respect to damage level. Modal frequency of the structure decreased as well as admittance value lowered with damage increment within the body. Pre-preg manufacturing method is carried out to fabricate composite panel from which samples are cut for testing according to ASTM standards. Panel is fabricated in such a way that enabled 45-degree fiber orientation with respect to the longitudinal axis of specimen. This strategy is taken to easily incorporate damage into the specimen via tensile test. 45-degree fiber orientation will make it easier to create damage compared to the longitudinally aligned fiber sample. Piezo patch is attached to the body and sine sweep voltage is applied to actuate the transducer. It provided voltage drop across the resistor that denoted the coupling effect of the patch with the host structure. Electrical admittance plot expressed response to body deformation actuated by the piezoelectric transducer. Results from finite element modeling and experimentation both indicate shift of frequency value of specific mode for damaged beam from healthy status. Therefore, piezoelectric admittance technique is efficient in detecting damage or degradation within composite structure.
Author : Ahmad Hamdan Ariffin
Publisher : Springer Nature
ISBN 13 : 9811962820
Total Pages : 262 pages
Book Rating : 4.8/5 (119 download)
Download or read book Structural Integrity and Monitoring for Composite Materials written by Ahmad Hamdan Ariffin and published by Springer Nature. This book was released on 2023-01-27 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on the recent technology and advancement in structural integrity and monitoring systems in composite materials. Composites have been widely used in automotive, aerospace and wind turbine industries, therefore it is important to develop state of the art technology to monitor and manage the damage tolerance and durability. This book explores the challenge of a monitoring system in a composite and presents a real-time system which has advantages for damage detection, localization, assessment and life prediction compared to the Non-Destructive Testing (NDT). It will also present the modelling and prediction of failure in a composite material based on computational analysis of the characteristics and properties of the composite material based on fiber and matrix properties. This book will benefit lecturers, students, researchers, engineers and industrialist who are working in the civil, mechanical engineering, automotive, aerospace and wind turbine industries.
Author : Zhongqing Su
Publisher : Springer Science & Business Media
ISBN 13 : 1848827849
Total Pages : 355 pages
Book Rating : 4.8/5 (488 download)
Download or read book Identification of Damage Using Lamb Waves written by Zhongqing Su and published by Springer Science & Business Media. This book was released on 2009-09-01 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lamb waves are guided waves that propagate in thin plate or shell structures. There has been a clear increase of interest in using Lamb waves for identifying structural damage, entailing intensive research and development in this field over the past two decades. Now on the verge of maturity for diverse engineering applications, this emerging technique serves as an encouraging candidate for facilitating continuous and automated surveillance of the integrity of engineering structures in a cost-effective manner. In comparison with conventional nondestructive evaluation techniques such as ultrasonic scanning and radiography which have been well developed over half a century, damage identification using Lamb waves is in a stage of burgeoning development, presenting a number of technical challenges in application that need to be addressed and circumvented. It is these two aspects that have encouraged us to write this book, with the intention of consolidating the knowledge and know-how in the field of Lamb-wave-based damage identification, and of promoting widespread attention to mature application of this technique in the practical engineering sphere. This book provides a comprehensive description of key facets of damage identification technique using Lamb waves, based on the authors’ knowledge, comprehension and experience, ranging from fundamental theory through case studies to engineering applications.
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (713 download)
Download or read book Damage Detection in Cryogenic Composites for Space Applications Using Piezoelectric Wafer Active Sensors written by and published by . This book was released on 2008 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lamb waves have proven to be effective for damage detection by passively listening for emitted signals from crack growth or actively interrogating the structure. Acoustic emission sensors are used for monitoring a wide number of defects in materials such as dynamic strain, crack growth, leakage, corrosion, delamination, and fiber breakage in composite structures. The present paper will present an extensive experimental evaluation of the structural health monitoring (SHM) capability of the PWAS on composite structures of different geometries, environmental conditions, and stress conditions. Results from these experiments indicate that a PWAS based array is capable of detecting low velocity impact damage in composite materials. These experiments showed that abrupt changes in the DI occurred for sensor paths near the impact damage sites, which also indicates that localization of the damage is feasible using PWAS based arrays for SHM. The robustness of the PWAS arrays is demonstrated for damage detection at ambient, cryogenic, and cryogenic temperatures under uniaxial loading using both pulse-echo and pitch-catch methods. Based on these results, a PWAS based SHM array is shown to be a promising method for impact damage detection in composite materials, even in extreme conditions.
Author : Maruthi Amardeep Sri Vatsavaya
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (789 download)
Download or read book Damage Detection in Composite Materials Using Carbon Nanotube Threads as Sensors written by Maruthi Amardeep Sri Vatsavaya and published by . This book was released on 2011 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials have excellent mechanical and thermal properties and are the materials of choice for many applications. Even so, the low inter-laminar mechanical properties and poor impact resistance of fiber reinforced composite materials has limited their use. Broader use of composites would be possible if, there was a continuous structural monitoring that could ensure the safe operation and economical maintenance of composites. The monitoring system can be made reliable and economical if the sensors could be embedded within the material. This thesis proposes a new approach to monitor the state of strain and delamination in composite materials. The method is to use carbon nanotube thread as a continuous sensor that can be placed wherever desired inside or onto the composite material. This thesis indicates the approach is new, simple and reliable. The significance of this continuous sensor is that it opens up development of the next generation of composite materials and structures that continuously monitor their state of strain and damage. This will provide a better prediction of their life span and allow the possibility of applying corrective action if neededThis thesis investigates structural health monitoring of simple composites based on monitoring the electrical resistance of fine threads used as embedded sensors. The threads are spun from Carbon Nanotube arrays. The threads exhibit a tailorable piezo-resistive property, which is the basis of the sensor operation. It is shown that the presence of CNT threads in simple specimens does not cause any significant voids or areas of stress concentrations, which might affect the overall mechanical properties of the material. Two types of sensor configurations were evaluated; a straight sensor and a stitched sensor. The behavior of these sensors was compared under tensile and bending loads in composite materials. These sensors are tested both for damage detection and strain sensing and successfully detected when the damage reached the thread. The continuous thread sensor may be an important component in the design of future aerospace composite structures that operate safely and economically.
Author : John E. Master
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (875 download)
Download or read book Damage Detection in Composite Materials written by John E. Master and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mitali G. Shah
Publisher :
ISBN 13 :
Total Pages : 354 pages
Book Rating : 4.:/5 (42 download)
Download or read book Dynamics-based Damage Detection of Beam-type Structures Using Piezoelectric Sensors and Scanning Laser Vibrometer written by Mitali G. Shah and published by . This book was released on 2005 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The enormous potential that the composite materials can offer to civil infrastructure, mechanical and aerospace industries, and many other sectors has been hindered due to the lack of reliable Structural Health Monitoring (SHM) system capable of detecting damage occurrence and predicting its related effect. Implementation of SHM techniques could substantially reduce the maintenance cost and minimize the likelihood of catastrophic failure of the structures. The main objective of this study is to evaluate the dynamics-based damage detection techniques for the beam-type composite structures using smart piezoelectric materials and modern instrumentation like Scanning Laser Vibrometer (SLV). The study comprises of testing six E-glass/epoxy composite beams with different damage configurations (i.e., delamination, saw-cut and impact damage) using two different sensor systems: (1) Polyvinylidenefluoride (PVDF) sensors and PZT (lead-zirconate-titanate) actuator patches, and (2) SLV system. The experimental tests are conducted using the two sensor systems, and the numerical finite element (FE) analysis is also performed to complement the damage detection. Eight different damage detection algorithms (i.e. absolute difference method (ADM), Damage Factor Method (DFM), Modified Damage Factor Method (MDFM), Damage Index Method (DIM), Uniform Load Surface (ULS), Gapped Smoothing Method (GSM), Strain Energy Method (SEM) and Generalized Fractal Dimension (GFD)) are employed to analyze the experimental and numerical data. Of the eight algorithms, the GSM, SEM and GFD using the ULS curvature mode shapes are emphasized, and a combined static-dynamic approach is further used to magnify the effect of damage. From the damage detection outcomes, it is observed that the PVDF sensor system in which the curvature mode shapes are directly acquired exhibited good sensitivity to damage and could locate damage accurately; while the SLV system proved to be more convenient and effective, and it was capable of scanning large number of points over the entire beam specimens. The damage detection algorithms like the GSM, SEM and GFD based on the utilization of ULS curvatures successfully identified the presence and location of damage without considering the data from the healthy beams as the reference. The GFD provided fairly good results; however, it showed extra peaks at locations other than the actual damage location. The employment of the static-dynamic approach apparently increased the effect of damage (e.g., the delamination), and the application of GSM, GFD and SEM further facilitated to quantify the magnifying effect. In conclusion, dynamic response measurement using two proposed sensor systems and related modal analysis and damage evaluation are demonstrated in this study. The successful implementation of the damage detection techniques, such as GSM, GFD, SEM and combined static-dynamic approach, validates the effectiveness and accuracy of the two sensor systems in damage detection, and they can be integrated with SHM application."--P. iii-iv.
Author : Łukasz Ambroziński
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (898 download)
Download or read book Damage Detection in Plate-like Metallic and Composite Structures Using Multiple Piezoelectric Transducers written by Łukasz Ambroziński and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Amer Society Composi
Publisher : CRC Press
ISBN 13 : 9781566762205
Total Pages : 1338 pages
Book Rating : 4.7/5 (622 download)
Download or read book American Society of Composites, Ninth International Conference Proceedings written by Amer Society Composi and published by CRC Press. This book was released on 1994-09-23 with total page 1338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
