Damage Detection In Thick Walled Composites Using Surface Mounted Piezoelectric Elements

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Damage Detection in Thick-Walled Composites Using Surface Mounted Piezoelectric Elements

Author : Strategic univ resources lexington ky
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (455 download)

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Book Synopsis Damage Detection in Thick-Walled Composites Using Surface Mounted Piezoelectric Elements by : Strategic univ resources lexington ky

Download or read book Damage Detection in Thick-Walled Composites Using Surface Mounted Piezoelectric Elements written by Strategic univ resources lexington ky and published by . This book was released on 1997 with total page 38 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.

Damage Detection in Composite Materials Using Piezoelectric Elements

Author : Xianghua Jian
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (343 download)

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Book Synopsis Damage Detection in Composite Materials Using Piezoelectric Elements by : Xianghua Jian

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:

Damage Detection in Composite Materials

Author : John E. Masters
Publisher : ASTM International
ISBN 13 : 0803114745
Total Pages : 280 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Damage Detection in Composite Materials by : John E. Masters

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

Damage Detection in Composite Materials Using PZT Actuators and Sensors for Structural Health Monitoring

Author : Michelle DuBose Spiegel
Publisher :
ISBN 13 :
Total Pages : 39 pages
Book Rating : 4.:/5 (895 download)

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Book Synopsis Damage Detection in Composite Materials Using PZT Actuators and Sensors for Structural Health Monitoring by : Michelle DuBose Spiegel

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.

A Preliminary Study on Damage Detection Using Piezoelectric Film

Author : J. Bennett
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis A Preliminary Study on Damage Detection Using Piezoelectric Film by : J. Bennett

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.

Damage Detection in Plate-like Metallic and Composite Structures Using Multiple Piezoelectric Transducers

Author : Łukasz Ambroziński
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (898 download)

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Book Synopsis Damage Detection in Plate-like Metallic and Composite Structures Using Multiple Piezoelectric Transducers by : Łukasz Ambroziński

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:

Damage Detection and Mitigation of Composite Structures Using Piezoelectric Materials

Author : Abu Saeed Islam
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (115 download)

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Book Synopsis Damage Detection and Mitigation of Composite Structures Using Piezoelectric Materials by : Abu Saeed Islam

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:

Damage Detection in Cryogenic Composites for Space Applications Using Piezoelectric Wafer Active Sensors

Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (713 download)

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Book Synopsis Damage Detection in Cryogenic Composites for Space Applications Using Piezoelectric Wafer Active Sensors by :

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.

Dynamics-based Damage Detection of Beam-type Structures Using Piezoelectric Sensors and Scanning Laser Vibrometer

Author : Mitali G. Shah
Publisher :
ISBN 13 :
Total Pages : 354 pages
Book Rating : 4.:/5 (42 download)

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Book Synopsis Dynamics-based Damage Detection of Beam-type Structures Using Piezoelectric Sensors and Scanning Laser Vibrometer by : Mitali G. Shah

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.

Impact Damage Identification of Composite Structures with Built-in Piezoelectric Sensor/Actuator Networks

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)

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Book Synopsis Impact Damage Identification of Composite Structures with Built-in Piezoelectric Sensor/Actuator Networks by :

Download or read book Impact Damage Identification of Composite Structures with Built-in Piezoelectric Sensor/Actuator Networks written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was performed to develop a self-diagnostic technique using a built-in piezoelectric wafer network to detect damage and to identify the extent of the damage in fiber-reinforced composite plates resulting from foreign-object impact. The principle of the technique was to use built-in piezoelectric wafers as actuators to generate stress waves and also use the neighboring piezoelectric wafers as sensors to receive the propagating waves. The difference in sensor measurements before and after the introduction or impact damage, referred to as scatter, contains information about the location and size of site impact damage. Accordingly, the proposed technique. consists of signal generation, signal processing, and damage identification. In the first part of the study, focus was on thin to moderately thick composites where identifying damage in the thickness direction was ignored and only a single piezoelectric wafer network through the composite plates was used. Diagnostic signals were selected for built-in piezoelectric actuators to generate appropriate Lamb waves to enhance the sensitivity of the sensor measurement to damage and to minimize signal noises due to environments. A signal-processing scheme composed of a smooth filtering and a joint time-frequency analysis was utilized to overcome noise interference and convert sensor measurements into sensor and scatter spectrograms in the time-frequency domain.

Damage Detection in Textile Composites Via Piezoelectric Admittance Methods

Author : Sazid Irfan Ahmed
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)

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Book Synopsis Damage Detection in Textile Composites Via Piezoelectric Admittance Methods by : Sazid Irfan Ahmed

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.

Modeling of Piezo-induced Ultrasonic Wave Propagation for Structural Health Monitoring

Author : Kuldeep Prakash Lonkar
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (857 download)

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Book Synopsis Modeling of Piezo-induced Ultrasonic Wave Propagation for Structural Health Monitoring by : Kuldeep Prakash Lonkar

Download or read book Modeling of Piezo-induced Ultrasonic Wave Propagation for Structural Health Monitoring written by Kuldeep Prakash Lonkar and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The process of implementing a damage detection and characterization strategy for engineering structures is referred to as structural health monitoring (SHM). Recently, damage detection using piezoelectric actuators and sensors has gained extensive attraction. Piezoelectric actuators are used to induce elastic stress waves that can propagate for long distances in thin-walled structures with very little amplitude loss enabling inspection of large areas of a structure. These waves interact with damage and provide information on location, size, and type of damage; this information is extracted from sensor signals by diagnostic algorithms. However, these signals are sensitive to the operating conditions. Change in ambient temperature or loading conditions may affect the wave propagation and the sensor response leading to inaccurate diagnostics. Hence, fundamental understanding of the physics of wave propagation, their interaction with the structure, and the influence of varying operating conditions is crucial for developing appropriate diagnostic algorithms. Therefore, the prime objectives of this investigation are: (i) develop an efficient and accurate numerical model to simulate the sensor signals and the piezo-induced acoustoelastic wave propagation in prestressed homogeneous and layered media, (ii) study the effect of load on wave propagation (acoustoelastic effect) and varying ambient temperature on the sensor signals. A numerical model called Piezo-Enabled Spectral Element Analysis (PESEA), based on spectral element method is developed. PESEA can accurately and efficiently simulate ultrasonic wave propagation in complex structures with built-in piezoelectric sensor network. Experiments and simulations are performed on metallic and composite structures to verify and validate the accuracy of PESEA. Fatigue cracks in metallic structures and debond/delamination is laminated composite structures are modeled by separating the nodes to create volume split. Simulations are carried out to show the wave-damage interaction and the scatter in the sensor signals due to damage. These simulation results show that PESEA can be used as a powerful tool to gain physical insights into the effect of different types of damage on wave propagation and sensor response. The influence of loading on ultrasonic waves actuated and sensed by piezoelectric sensors in aluminum plate is studied. A numerical and experimental study of axially stressed aluminum plates with surface-mounted piezoelectric sensors is carried out to investigate the dependence of wave velocity on applied load. Similarly, simulations and experiments are presented to understand how the piezoelectric sensor signal amplitude changes with adhesives of different thickness and material when the structure is exposed to elevated temperature.

Proceedings of the 16th International Modal Analysis Conference

Author : Alfred L. Wicks
Publisher :
ISBN 13 :
Total Pages : 836 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Proceedings of the 16th International Modal Analysis Conference by : Alfred L. Wicks

Download or read book Proceedings of the 16th International Modal Analysis Conference written by Alfred L. Wicks and published by . This book was released on 1998 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

International Aerospace Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 974 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis International Aerospace Abstracts by :

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Proceedings of the 16th International Modal Analysis Conference

Author : Society for Experimental Mechanics (U.S.)
Publisher :
ISBN 13 :
Total Pages : 1054 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Proceedings of the 16th International Modal Analysis Conference by : Society for Experimental Mechanics (U.S.)

Download or read book Proceedings of the 16th International Modal Analysis Conference written by Society for Experimental Mechanics (U.S.) and published by . This book was released on 1998 with total page 1054 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Shock and Vibration Digest

Author :
Publisher :
ISBN 13 :
Total Pages : 552 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis The Shock and Vibration Digest by :

Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1999 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 456 pages
Book Rating : 4.:/5 (3 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 1995 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.