Log in

Relevant bibliographies by topics / Composite materials. Stress waves

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Composite materials. Stress waves'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Composite materials. Stress waves.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Composite materials. Stress waves"

1

Clements, B. E., J. N. Johnson, and R. S. Hixson. "Stress waves in composite materials." Physical Review E 54, no. 6 (December 1, 1996): 6876–88. http://dx.doi.org/10.1103/physreve.54.6876.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Abd-alla, Abo-el-nour N., MIA Othman, and NF Hasbullah. "Shear horizontal waves in composite materials: Behavior under rotation and initial stress." Mathematics and Mechanics of Solids 24, no. 1 (October 6, 2017): 85–97. http://dx.doi.org/10.1177/1081286517730682.

Full text

Abstract:

The main scope of this paper is to present in a simple and concise way a mathematical model of composite materials able to describe the propagation of shear horizontal waves in the case where composite is rotating and subjected to an initial stress. This work is aimed at the relevant possibility to apply the obtained results for the establishment of high-achievement applications of piezoelectric and semiconductor composites and surface acoustic waves devices. We conclude by analyzing numerical computations in which the influence of the rotation, initial stress and electromagnetic boundary conditions are graphically observed.

APA, Harvard, Vancouver, ISO, and other styles

3

Xu, Dandan, and Yu Guo. "Local Resonant Attenuation of Stress Waves in Particulate Composites." Materials 14, no. 11 (June 1, 2021): 2991. http://dx.doi.org/10.3390/ma14112991.

Full text

Abstract:

The attenuation of stress waves due to the local resonance is numerically studied using the finite element method (FEM) in this work. The natural frequency of a representative composite unit embedded with coated particles is analyzed and the major factors that influence the natural frequency are examined. Local resonance is inspired when the frequency of the incident stress wave is close to the natural frequency of the particles in the composite. Significant reduction in the amplitude of the stress is obtained when the local resonance occurs, because a large amount of the incident energy is converted to the kinetic energy of the particles, which is rapidly dissipated through the strong oscillations of those particles. It is also observed that the attenuation for the incident stress waves with a range of frequencies can be achieved by using the particles with various local natural frequencies in a composite.

APA, Harvard, Vancouver, ISO, and other styles

4

Kim, Jin O., and Haim H. Bau. "A Study of the Fiber-Matrix Interface in Composite Materials." Journal of Applied Mechanics 59, no. 2S (June 1, 1992): S163—S165. http://dx.doi.org/10.1115/1.2899482.

Full text

Abstract:

A novel experimental technique for studying the characteristics of the interface between the fibers and the matrix in both undamaged and damaged fiber-reinforced composite materials is described. The experimental technique involves the transmission of stress waves in one or more fibers of the composite. The characteristics of the stress waves, such as speed, dispersion, and attenuation, are measured. These measured variables can be correlated with the characteristics of the bonding between the fiber and the matrix.

APA, Harvard, Vancouver, ISO, and other styles

5

Chimenti, D. E. "Guided Waves in Plates and Their Use in Materials Characterization." Applied Mechanics Reviews 50, no. 5 (May 1, 1997): 247–84. http://dx.doi.org/10.1115/1.3101707.

Full text

Abstract:

In this review article, the ultrasonic characterization of materials using guided plate waves and their usage to elucidate mechanical properties of plate-like structures is reviewed. The purpose here is to summarize and explain the large body of theoretical and experimental work in this developing field. It is also to gain a perspective on recent salient contributions and to analyze the current state of knowledge and practice in guided wave ultrasonics. Models of waves in plates are examined, as are the means to generate and detect them. Their application to several problems of current interest in materials characterization is treated in detail. In particular, composite materials and their inspection and characterization have been a major impetus in the development of guided wave methods. Techniques to inspect composites sensitively and reliably for defects and to probe their micromechanical behavior are a major focus of this article. Also considered are the characterization of adhesive bonds, the measurement of stress and texture, and the detection of defects using guided waves. This review article contains 362 references.

APA, Harvard, Vancouver, ISO, and other styles

6

Ejaz, K., and M. Shams. "Love waves in compressible elastic materials with a homogeneous initial stress." Mathematics and Mechanics of Solids 24, no. 8 (June 18, 2018): 2576–90. http://dx.doi.org/10.1177/1081286518771726.

Full text

Abstract:

In this paper, the motion of Love waves is considered in hyperelastic materials with an initially stressed reference configuration. Here, the Love wave is directed by a compressible layer on a compressible half-space and both are considered to be initially stressed. For the basic formulation of the problem, we make use of the nonlinear theory of elasticity and invariants of the stress tensor and deformation tensor. The equations governing a finite deformation superimposed by infinitesimal motions are used to the study the composite effect of finite deformation and initial stress on wave speed. Graphical illustrations are presented for theoretical results for a prototype model of material and also compared with the results already obtained for incompressible materials.

APA, Harvard, Vancouver, ISO, and other styles

7

Walker, James Davidson, and Efthymios Stefanos Folias. "Effect of stress waves on laminated composite plates." International Journal of Solids and Structures 29, no. 2 (1992): 145–70. http://dx.doi.org/10.1016/0020-7683(92)90104-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Glukhov, A. Yu. "Axisymmetric waves in laminated composite incompressible materials with initial stresses under the slipping of layers." Reports of the National Academy of Sciences of Ukraine, no. 10 (November 16, 2016): 42–46. http://dx.doi.org/10.15407/dopovidi2016.10.042.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Zou, Zhouyiao, Yanpeng Hao, Yao Zheng, Weiming He, Fangyuan Tian, Lin Yang, and Licheng Li. "Subsurface Stress Measurement in GIS Epoxy Composite by Using LCR Waves." Energies 13, no. 14 (July 20, 2020): 3725. http://dx.doi.org/10.3390/en13143725.

Full text

Abstract:

Internal stress in basin insulators of gas-insulated metal-enclosed switchgear (GIS) can lead to cracks, which affects the safe operation of these apparatuses. In this research, we proposed a subsurface internal stress measurement method for GIS epoxy composites. This method is based on an ultrasonic longitudinal critically refracted (LCR) wave technique. In this study, some epoxy composite specimens were synthesized with similar materials and manufacturing processes to those of 252 kV GIS basin insulators. An ultrasonic stress measurement system that utilized the LCR wave technique was set-up to investigate the relationship between stress and LCR wave propagation time, as well as to measure the compressive stress of the epoxy specimen within 0–50 MPa. The results show that LCR wave propagation time linearly decreased when stress increased in the subsurface zone and the acoustoelastic coefficient was −4.95. We found the relative errors of stress measurements to be less than 13%.

APA, Harvard, Vancouver, ISO, and other styles

10

Zou, Zhouyiao, Yanpeng Hao, Fangyuan Tian, Yao Zheng, Weiming He, Lin Yang, and Licheng Li. "An Ultrasonic Longitudinal Through-Transmission Method to Measure the Compressive Internal Stress in Epoxy Composite Specimens of Gas-Insulated Metal-Enclosed Switchgear." Energies 13, no. 5 (March 7, 2020): 1248. http://dx.doi.org/10.3390/en13051248.

Full text

Abstract:

Situations of internal stress in basin insulators inside gas-insulated metal-enclosed switchgear (GIS) can lead to cracks, which can influence the safety and stability of apparatus. However, there is currently no research on internal stress measurements for composites of GIS basin insulators, and only measurements for surface stress. In this paper, an internal stress measurement method for GIS epoxy composite is proposed using an ultrasonic longitudinal through-transmission technique based on the acoustoelastic effect. An internal stress measurement system is developed to investigate the relationship between the uniaxial compressive internal stress and the velocity of the ultrasonic wave vertical to the stress in epoxy composite within a range of 0–70 MPa, and to calculate the acoustoelastic coefficient of epoxy composite. The effects of system delay are eliminated in measuring the propagation time. Some epoxy composite cuboid specimens with similar materials and using a manufacturing process similar to those of 252 kV GIS basin insulators are synthesized, and the uniformity of the internal stress in cuboid specimens is verified by finite element simulation. The results reveal a linear increase of the ultrasonic longitudinal wave velocity with increasing stress. It has been shown that the average acoustoelastic coefficient of GIS epoxy composites, using the longitudinal waves vertical to the stress, is 4.556 × 10−5/MPa. Additionally, the absolute errors of the internal stress measurements are less than 12.397 MPa. This research shows that the ultrasonic method based on the acoustoelastic effect for measuring the internal stress in GIS epoxy composites is feasible.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Composite materials. Stress waves"

1

Tasdemirci, Alper. "Experimental and modeling studies of stress wave propagation in multilayer composite materials." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 11.67 Mb., 261 p, 2006. http://wwwlib.umi.com/dissertations/fullcit/3200525.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Madhav, Arun. "Statistical methods applied to acousto-ultrasonic technique." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45791.

Full text

Abstract:

The growth in the extent of applications of composite materials, particularly in commercial products, has been dramatic and carries an implied mandate for effective methods for material quality evaluation. The cost of composite materials dictates that non-destructive test methods be used. At the same time, the nature of composites limits the use of conventional techniques such as radiography , eddy-current or ultrasonics. Recently, a new technique known as the Acousto-Ultrasonic (AU) technique, has been developed and appears to hold promise as a method for the evaluation of composite material quality.

Implementation of the AU method is examined using the zeroth moment method developed by Henneke et.al. A new parameter termed as Acousto Ultrasonic Factor (AUF) has been defined for this purpose. The behavior of the AUF response to specimens of known quality is investigated statistically. It is found that the transformed/actual readings follow a Beta distribution and that specimens of different quality are readily distinguishable using the statistical analysis of the AUF response. Reasonable future steps for translating these findings into efficient quality evaluation methods have been suggested.Master of Science

APA, Harvard, Vancouver, ISO, and other styles

3

Jain, Jayesh R. "Homogenization Based Damage Models for Monotonic and Cyclic Loading in 3D Composite Materials." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1230431496.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Sambasivam, Shamala. "Thermoelastic stress analysis of laminated composite materials." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72144/.

Full text

Abstract:

In this work thermoelastic stress analysis (TSA) is used to obtain quantitative stress/ strain data from a variety of multi-directional laminated composites. In order to in- terpret the thermoelastic signal correctly the source of the thermoeleastic response has been investigated in detail. In this thesis four possible routines to extract quantitative stress/strain information from thermoelastic data have been explored. A set of carefully selected glass/epoxy composite specimens with designated stacking sequences provided a scheme to identify the source and nature of the thermoelastic response. All of the material properties of the composite laminate were obtained experimentally, to aid an accurate assessment of each routine. The variation in the stress experienced by the laminate in the surface resin layer and ply by ply there after leads to large variations in the temperature change through the thickness. The thermoelastic measurements from dierent laminates revealed a local non-adiabatic condition within the layered medium. Therefore, the implication of applied loading frequency on the heat conduction properties of the laminates was studied. Based on the experimental observation from a representa- tive specimen, numerical models have been developed to understand the nature of the heat transfer in the glass/ epoxy material considered in this work. An analysis of the eect of holes in a variety of laminated components is presented to provide stress concen- tration factors (SCF's) based on TSA data. The conventional, orthotropic surface ply model most often used for thermoelastic stress analysis of composite material is revisited in order to elucidate the invariant nature of the equation. This is an important base for the analysis of structures which are better notated in coordinate system other than Cartesian, or as ratio of thermoelastic measurements in two dierent coordinate systems. The nature of the thermoelastic response in the presence of the in-plane stress gradient is investigated with the aid of numerical and analytical models. An introductory work for quantifying the SCF's around pin-loaded holes in laminated composite based on TSA measurements is also presented. The work presented in this thesis provides a step forward in the application of TSA to the composite materials in a quantitative manner.

APA, Harvard, Vancouver, ISO, and other styles

5

Seale, Michael David. "Propagation of guided acoustic waves in composite media." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539623884.

Full text

Abstract:

Composite materials are being more widely used today by aerospace, automotive, and a number of other commercial industries because of their advantages over conventional metals. Composites are finding applications ranging from bicycle frames to the proposed High-Speed Civil Transport (HSCT). Determining the response to a variety of damage mechanisms is necessary for a complete understanding of the total use environment of composite structures. The objective of the research presented here is to provide a method of quantifying the amount of damage in composite materials for a number of different damage scenarios. Components which have non-visible damage, but have degraded performance, are of interest. at this level of damage, the safety margin designed into the structure may be compromised.;Nondestructive Evaluation (NDE) is a field of measurement physics where energy is imparted to a material and information is obtained from observing how the energy interacts with the system. Many different forms of energy can be used to obtain useful information from these measurements: acoustic, thermal, x-ray, optical, and electromagnetic. Among the many various techniques available, ultrasonic Lamb waves offer a convenient method of evaluating these composite materials. as a material is damaged, the elastic parameters of the structure change. Since the Lamb wave velocity depends on these properties, an effective tool exists to monitor damage in composites by measuring the velocity of these waves. Additionally, Lamb wave measurements are beneficial because they can propagate over long distances and are sensitive to the desired in-plane elastic properties of the material.;Presented in this study are the results involving the investigation of a variety of damage mechanisms (fatigue, thermal, and thermal-mechanical) using the Lamb wave technique. Two fatigue studies were conducted which showed that the change in modulus and change in velocity of the Lamb wave squared follow the same general trend. The Lamb wave velocity was also observed to decrease with increasing crack density. For the thermal damage study, the results showed that the velocity of the lowest order symmetric Lamb mode dropped significantly for extended thermal damage. When the experimental results were compared to model calculations, good agreement was observed for both fatigue and thermal damage. Finally, for thermal-mechanical damage, it was found that the Lamb wave technique was also able to predict a local defect in a specimen, which was later found to have a large delamination zone.;The Lamb wave velocity is a quantitative measurement and it has been shown by this work to be an effective tool in monitoring different types of damage in composites. Since the Lamb wave velocity depends on a variety of material properties, an ideal technique exists to monitor composites as damage is incurred. With the continued development of damage assessment techniques such as the Lamb wave method, the safety of such structures can be assured.

APA, Harvard, Vancouver, ISO, and other styles

6

Li, Rufeng. "Nonlinear viscoelastic stress and fracture analyses of laminated composites /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9978.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Choi, John O. "Dynamic stress intensity factors in orthotropic materials." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/12409.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Fung, Kin-Hung. "Phononic band gap of locally resonant sonic materials with finite thickness /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202004%20FUNG.

Full text

Abstract:

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 73-74). Also available in electronic version. Access restricted to campus users.

APA, Harvard, Vancouver, ISO, and other styles

9

Emery, Trystan Ross. "Identification of damage in composite materials using thermoelastic stress analysis." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/51292/.

Full text

Abstract:

A quantitative damage assessment methodology for composite materials has been achieved using Thermoelastic Stress Analysis (TSA). The TSA technique provides fullfield data which is collected in a non-contacting and real time manner. The damage assessment methodology proposed requires a means of calibrating and temperature correcting the thermoelastic signal; these are developed and presented in this thesis. The thermoelastic theory for calibrating thermoelastic data from orthotropic bodies has traditionally been based on a stress formulation. There are difficulties in calibrating orthotropic materials in this manner and an alternative calibration routine has been devised and validated. The calibration routine provides the thermoelastic theory as a function of strain and permits a simplified calibration route as the laminate strains are the basis and can be measured in a straightforward manner. During damage propagation in laminated structures the specimen heats. The increase in temperature has a significant effect on the thermoelastic data and necessitates that the thermoelastic data be corrected to remove the effect of temperature from the data. A routine is developed that enables the correction of the thermoelastic data in a point-bypoint manner. By combining the strain calibration and temperature correction procedures a damage assessment methodology has been devised. The application of the methodology is demonstrated on glass / epoxy laminate specimens that are fatigue damaged and the damage state assessed using this method; the extent and type of damage is verified qualitatively using visual inspection methods. The work described is applicable to any orthotropic material. The effect of fatigue damage is assessed by periodically collecting thermoelastic data during the specimen life. This data is analysed using damage metrics based on the calibrated strain obtained from the TSA. The wider application of the TSA damage assessment methodology is considered by assessing the ability to locate subsurface damage. A complementary IR technique is used in conjunction with TSA known as Pulse Phase Thermography (PPT). Initial studies demonstrate the ability to resolve the spatial extents of subsurface damage. The purpose of this step is to guide TSA to areas of concern that can subsequently be assessed using the damage metrics to characterise the effect of damage on the residual life of the component. The strain calibration and temperature correction methods that enable TSA to be applied quantitatively to damaged composite materials have not been accomplished prior to this work. They provide novel methods by which TSA data can be assessed, and their application is not restricted to damage studies alone. The ability to temperature correct TSA data has been shown to be of vital importance if thermoelastic data is to be compared in a quantitative fashion. The strain calibration procedure presented will enable thermoelastic studies to be reported quantitatively and expand the application of TSA particularly in validation studies. The damage assessment methodology presented represents a step forward in the application of TSA to the damage assessment of composite materials.

APA, Harvard, Vancouver, ISO, and other styles

10

Kiernan, Michael T. "An acousto-ultrasonic system for the evaluation of composite materials." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/76441.

Full text

Abstract:

A presentation is given of an acousto-ultrasonic system for the evaluation of composite materials. First, a brief statement will be made on the acousto-ultrasonic technique and its relative worth compared to other nondestructive testing techniques as applied to composite materials. The following two chapters describe the system instrumentation and system software, respectively. Next, comments are given regarding the implementation of the system for research on graphite/epoxy laminates, with additional remarks concerning efforts to evaluate aluminum/graphite tubes with the system. This includes physical descriptions of the composite systems. Subsequently, results are presented comparing parameters and forms of presentation which can be employed to relate results. Finally, conclusions are made on the application of the acousto-ultrasonic system to nondestructive testing of composite materials, with specific results on its application to graphite/epoxy plates. More specifically, comments are made on the variation of SWF factors with azimuthal angle on the graphite/epoxy plates, the identification of specific frequency peaks, and the relationships these may have to certain modes of vibration and material properties. For example, a low frequency mode was found to vary in a manner reminiscent of E_x and to show characteristics of an extensional Lamb wave. In general, results are presented and discussed in order to show how the system can be implemented to gain physical information on composite materials, such as the property of anisotropy.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Composite materials. Stress waves"

1

Duke, John C. Ultrasonic stress wave characterization of composite materials. Cleveland, Ohio: Lewis Research Center, 1986.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Duke, John C. A study of the stress wave factor technique for evaluation of composite materials. Cleveland, Ohio: Lewis Research Center, 1989.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

Joint, ASME/SES Applied Mechanics and Engineering Sciences Conference (1988 Berkeley Calif ). Wave propagation in structural composites: Presented at the Joint ASME/SES Applied Mechanics and Engineering Sciences Conference, June 20-22, 1988 : sponsored by the Wave Propagation and Composite Materials Committee of the Applied Mechanics Division, ASME. New York: American Society of Mechanical Engineers, 1988.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

Joint, ASME/SES Applied Mechanics and Engineering Sciences Conference (1988 Berkeley Calif ). Wave propagation in structural composites: Presented at the Joint ASME/SES Applied Mechanics and Engineering Sciences Conference, Berkeley, California, June 20-22, 1988. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1988.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

5

Calvert, Geoffrey C. Stress analysis techniques for composite materials. [s.l.]: typescript, 1992.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

6

R, White S., ed. Stress analysis of fiber-reinforced composite materials. Boston, Mass: WCB McGraw-Hill, 1998.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

7

Hyer, Michael. Stress analysis of fiber-reinforced composite materials. Boston, Mass: McGraw-Hill, 1998.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

8

Stress concentrations in laminated composites. Lancaster, Pa: Technomic Pub. Co., 1994.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

9

Crews, John H. An analysis of fiber-matrix interface failure stresses for a range of ply stress states. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1993.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

10

Crews, John H. An analysis of fiber-matrix interface failure stresses for a range of ply stress states. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1993.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Book chapters on the topic "Composite materials. Stress waves"

1

Green, W. A., and E. R. Green. "Impact Stress Waves in Fibre Composite Laminates." In Developments in the Science and Technology of Composite Materials, 993–98. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0787-4_143.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Huber, Robert D., and James W. Wagner. "Optical Detection of Stress Waves in Glass Fiber Reinforced Plastic Composite Material." In Nondestructive Characterization of Materials VI, 341–47. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2574-5_43.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Blazynski, T. Z. "Stress Waves and Material Response." In Dynamically Consolidated Composites: Manufacture and Properties, 9–50. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2892-6_2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Andersen, Kristian Gjerrestad, Gbanaibolou Jombo, Sikiru Oluwarotimi Ismail, Yong Kang Chen, Hom Nath Dhakal, and Yu Zhang. "Damage Characterisation in Composite Laminates Using Vibro-Acoustic Technique." In Springer Proceedings in Energy, 275–82. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_34.

Full text

Abstract:

AbstractThe need to characterise in-service damage in composite structures is increasingly becoming important as composites find higher utilisation in wind turbines, aerospace, automotive, marine, among others. This paper investigates the feasibility of simplifying the conventional acousto-ultrasonic technique set-up for quick and economic one-sided in-service inspection of composite structures. Acousto-ultrasonic technique refers to the approach of using ultrasonic transducer for local excitation while sensing the material response with an acoustic emission sensor. However, this involves transducers with several auxiliaries. The approach proposed herewith, referred to as vibro-acoustic testing, involves a low level of vibration impact excitation and acoustic emission sensing for damage characterisation. To test the robustness of this approach, first, a quasi-static test was carried out to impute low-velocity impact damage on three groups of test samples with different ply stacking sequences. Next, the vibro-acoustic testing was performed on all test samples with the acoustic emission response for the samples acquired. Using the acoustic emission test sample response for all groups, the stress wave factor was determined using the peak voltage stress wave factor method. The stress wave factor results showed an inverse correlation between the level of impact damage and stress wave factor across all the test sample groups. This corresponds with what has been reported in literature for acousto-ultrasonic technique; thus demonstrating the robustness of the proposed vibro-acoustic set-up. Structural health monitoring, impact damage, acousto-ultrasonic testing, non-destructive testing.

APA, Harvard, Vancouver, ISO, and other styles

5

Nielsen, Lauge Fuglsang. "Composite Eigenstrain/Stress." In Composite Materials, 39–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-27680-7_6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Nielsen, Lauge Fuglsang. "Preliminaries on Stress/Strain." In Composite Materials, 17–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-27680-7_3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Nielsen, Lauge Fuglsang. "Composite Stress and Geometry." In Composite Materials, 23–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-27680-7_4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Kafesaki, M., E. N. Economou, and M. M. Sigalas. "Elastic Waves in Periodic Composite Materials." In Photonic Band Gap Materials, 143–64. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1665-4_9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Schneider, Luis Felipe, and Rafael R. Moraes. "Polymerization Shrinkage Stress." In Dental Composite Materials for Direct Restorations, 219–33. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60961-4_14.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Soutis, C., and S. H. Díaz Valdés. "Delamination Detection in Laminated Composites Using Lamb Waves." In Recent Advances in Composite Materials, 109–26. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2852-2_10.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Composite materials. Stress waves"

1

Pereira, Paulo, Tainá G. Rodovalho, Leandro B. Ambiel, Rafael H. Garcia, Rodrigo J. Leão, and Auteliano A. dos Santos. "Comparison of Signal Filtering Techniques for Ultrasonic Waves Used in Inspection of Composite Materials." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62601.

Full text

Abstract:

The use of composite materials is growing worldwide as the number of its applications. Regarding the quality of components made from composites especially in fields that require high safety standards, such as aerospace, reliable inspection techniques must be used. Nondestructive inspection techniques using ultrasonic waves are largely employed in metals for fault detection, characterization, and stress measurement and they are also being applied in composites. However, composites are heterogeneous in nature and thus the signals acquired from ultrasonic transducers in these materials exhibit high noise, leading to inaccurate measurements. The objective of this work is to evaluate digital filtering techniques for signals from ultrasonic longitudinal bulk waves and longitudinal critically refracted (LCR) waves propagating in a carbon fiber-epoxy prepreg. Samples of unidirectional composites were manufactured to study the signals of waves propagating at different angles in relation to the carbon fibers direction. For bulk waves, we acquired signals at 0, 15, 30, 45, 60, 75 and 90° from the fiber directions; for LCR waves, the signals were measured at 0 and 90°. We compared the techniques based on digital filters IIR (Infinite Impulse Response), FIR (Finite Impulse Response) and Discrete Wavelet Transform (DWT). The results show that the filters FIR and IIR have the best signal-to-noise ratio (SNR) for most propagation directions, both for bulk and LCR waves.

APA, Harvard, Vancouver, ISO, and other styles

2

Tran, Duy, Kassahun M. Asamene, and Mannur J. Sundaresan. "Measurement of stress wave attenuation in composite laminates." In Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII, edited by Andrew L. Gyekenyesi. SPIE, 2019. http://dx.doi.org/10.1117/12.2518278.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Vieira Gonçalves, Vanessa, Auteliano Antunes dos Santos, and Paulo Pereira. "Investigation of Effect of Non-Uniformities in Unidirectional Carbon Fiber Composite on the Lcr Waves Speed Using Phased Arrays." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53517.

Full text

Abstract:

Structural parts benefit on a reliable, nondestructive inspection technique to measure stresses, both applied and residual. Among the candidates, ultrasonic techniques have proven to have enough sensitivity to strain to be employed in service. The way to obtain the stresses is through the measurement of the time-of-flight inside the material and relates it to the strain by acoustoelastic theory or previous measurements. However, stress measurement using ultrasound strongly depends on the uniformity of the material under inspection. In composite materials, the time-of-flight is influenced by microdefects and misalignments in the fibers as well as by the applied strain and temperature. This last factor can be known and controlled, but non uniformities are a characteristic of one particular region or part. Thus, unless employed to a very particular case of a completely uniform region been inspected in a special developed part, UT could not be used to measure stresses in this kind of material without some previous information about it. This work presents an investigation about the effect of non-uniformities in carbon fiber-epoxy pre-preg composites and how to relate them with the time-of-flight of critically refracted longitudinal waves (Lcr) propagating in the fiber direction (main structural direction). A Phased Array System (PAS) with probe of 5 MHz and 64 transducers are employed to generate an image of each part in the region where the Lcr wave travels. The image is created employing the Total Focusing Method (TFM). Two bars of carbon fiber composites with epoxy matrix (HexTow® AS4 / Hexply® 8552) were tested. Five measurement positions are selected, uniformly distributed on the part surface. Statistically significant differences between the parts were found in the time-of-flight for Lcr waves when no stress is applied; even knowing they were manufactured using the same process and materials. The parts were evaluated using the PAS. No difference was found between measurements in the same bar. The parameter chosen to evaluate the non-uniformity was the peak value of the back-wall signal divided by the RMS value of the noise intensity, which was called signal-to-noise ratio (SNR). The results show also significant difference between the SNR of both parts, although with higher dispersion than with Lcr. It can be noticed that there is a correlation between the time-of-flight of Lcr waves and the SNR, indicating that the research could be extended to the development of a new joint technique to be used to measure stresses in composite parts.

APA, Harvard, Vancouver, ISO, and other styles

4

Nargund, Shrikant. "Evaluation of Stress Wave Attenuation in a Polymer Matrix Composite Using Finite Element Analysis Technique." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67055.

Full text

Abstract:

The dynamic behavior of polymer composites is significantly affected by the properties of their micro constituents including shape and size of inclusions and inclusions/matrix adhesion properties. Wave propagation through such a composite is a complex phenomenon as it includes random scattering, absorption and transmittance of the incident wave and is dependent upon factors such as the properties, size and placement of the inclusions inside the matrix. Finite element modeling provides a viable approach for investigating the effects of micro constituent structure on the dynamic behavior of polymer composites. In this paper, we investigate the stress wave attenuation characteristics of a particulate polymer matrix composite using Finite Element (FE) analysis approach. The wave attenuation of ultrasonic sinusoidal waves of frequency ranging from 1 MHz to 4 MHz is evaluated for different FE models. The spherical inclusions are randomly distributed inside the polymer matrix with a certain minimum distance apart from each other. Inclusion-Matrix adhesion properties are studied by modeling a small region at the interface of inclusions and matrix known as interphase region. The interphase region is modeled explicitly using the cohesive zone modeling approach to study how the properties of this region will affect the wave attenuation characteristics of the polymer composite. Cohesive zone models are governed by traction separation law which helps in the measurement of the inclusion-matrix bonding strength and also allow the study of de-bonding at the interface in the critically stressed region produced due application of load. Thus the FE models consist of three phases; polymer matrix, particulate inclusions and the interphase region. Various three dimensional FE models are created using 3D tetrahedral/hexahedral elements by varying the radius of the spherical inclusions and by varying volume fraction of the inclusions. The analyses are performed using a general purpose finite element software LS-Dyna. A rate dependent viscoelastic material model with four terms in prony series expansion is used for modeling the polymer matrix. A linear elastic isotropic material model is used for modeling the inclusions. The wave attenuation is measured as reduction in the amplitude of the wave as it passes through the composite. A comparison of results for various models is done to check for general trend of attenuation coefficient as a function of size of inclusions, volume fraction of inclusions, frequency of loading and interphase region properties. Results show that volume fraction and load frequency have a maximum effect on the wave attenuation coefficient. Interphase region stiffness and interface de-bonding also plays an important role in attenuation characteristics of the polymer composite.

APA, Harvard, Vancouver, ISO, and other styles

5

Tian, Zhenhua, Cara A. C. Leckey, Jeffrey P. Seebo, and Lingyu Yu. "Guided Wave Delamination Detection and Quantification With Wavefield Data Analysis." In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7645.

Full text

Abstract:

Unexpected damage can occur in aerospace composites due to impact events or material stress during off-nominal loading events. In particular, laminated composites are susceptible to delamination damage due to weak transverse tensile and interlaminar shear strengths. Developments of reliable and quantitative techniques to detect delamination damage in laminated composites are imperative for safe and functional optimally-designed next-generation composite structures. In this paper, we investigate guided wave interactions with delamination damage and develop quantification algorithms by using wavefield data analysis. The trapped guided waves in the delamination region are observed from the wavefield data and further quantitatively interpreted by using different wavenumber analysis methods. The frequency-wavenumber representation of the wavefield shows that new wavenumbers are present and correlate to trapped waves in the damage region. These new wavenumbers are used to detect and quantify the delamination damage through the wavenumber analysis, which can show how the wavenumber changes as a function of wave propagation distance. The location and spatial duration of new wavenumbers can be identified, providing a useful means not only for detecting the presence of delamination damage but also for estimation of the delamination size. Our method has been applied to detect and quantify real delamination damage with complex geometry (grown using a quasi-static indentation technique). The detection and quantification results show the location, size, and shape of the delamination damage.

APA, Harvard, Vancouver, ISO, and other styles

6

Li, Sheng, and Cliff J. Lissenden. "Modeling Ultrasonic Guided Wave Generation From Piezoelectric Fiber Composite Strip Actuators." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3771.

Full text

Abstract:

Structural health monitoring (SHM) and condition based maintenance (CBM) are keys to shifting the paradigm from schedule based maintenance to cost effective operation and maintenance of reliable systems. Continuous comb transducer strips have the potential to generate ultrasonic guided waves for structural health monitoring of plate and shell structures (pipelines, pressure vessels, storage tanks, airframes). A theoretically driven approach, based on the application of wave mechanics principles, is used to research and design a network of strip sensor. Fibrous piezoelectric composites are considered for the comb elements, widely expanding the design space of these elements to include fiber orientation and volume fraction in addition to size, configuration, and location of the electrodes. Piezoelectric and mechanical properties for these innovative sensor designs are estimated through micromechanical modeling. Specifically, micromechanics enables us to consider different fiber orientations and constituent properties and provides the composite properties for input to finite element analysis of wave propagation. Finite element simulations of ultrasonic guided wave generation and propagation using Abaqus Explicit-Standard Co-Simulation are conducted in order to design the sensory system.

APA, Harvard, Vancouver, ISO, and other styles

7

Lin, Jin-Chein, T. Y. Yang, and L. C. Chang. "Measurement of Transverse Deflection for Composite Laminates Using Holographic Interferometry." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35261.

Full text

Abstract:

Holographic interferometry is an accurate and important technolngy. Through the application of recording and reconstructing light waves, one can solve a wide variety of mechanical or engineering problems caused by internal stresses, mechanical, electrical or thermal effects. The mechanical properties of composite materials, such as, deflection, strain and stress will be determined by the fiber types, the cross-section of specimens ans the fiber orientation of composite laminate. The purpose of this investigation will discuss the holographic technique and its application of measurement of transverse deflection for various composite laminates. The analysis for both theoretical and experimental results will be presented, and the effect of fiber orientation for composite laminate will be studied in this paper.

APA, Harvard, Vancouver, ISO, and other styles

8

Mares, Jesus O., Daniel C. Woods, Caroline E. Baker, Steven F. Son, Jeffrey F. Rhoads, J. Stuart Bolton, and Marcial Gonzalez. "Localized Heating due to Stress Concentrations Induced in a Lossy Elastic Medium via the Scattering of Compressional Waves by a Rigid Spherical Inclusion." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-68219.

Full text

Abstract:

High-frequency mechanical excitation has been shown to generate heat within composite energetic materials and even induce reactions in single energetic crystals embedded within an elastic binder. To further the understanding of how wave scattering effects attributable to the presence of an energetic crystal can result in concentrated heating near the inclusion, an analytical model is presented. The stress and displacement solutions associated with the scattering of compressional plane waves by a spherical obstacle (Pao and Mow, 1963) are modified to account for the viscoelastic effects of the lossy media surrounding the inclusion (Gaunaurd and Uberall, 1978). The results from this solution are then utilized to estimate the spatial heat generation due to the harmonic straining of the material, and the temperature field of the system is predicted for a given duration of time. It is shown that for certain excitation and sample configurations, the elicited thermal response near the inclusion may approach, or even exceed, realistic decomposition temperatures of various energetic materials. Although this prediction indicates that viscoelastic heating of the binder may initiate the decomposition of the crystal even in the absence of defects such as initial voids or debonding between the crystal and binder, the thermal response resulting from this bulk heating phenomenon may be a precursor to dynamic events associated with such crystal-scale effects.

APA, Harvard, Vancouver, ISO, and other styles

9

Sadeghi, Hossein, Joseph Magallanes, and John Crawford. "A Numerical Study on Shock Wave Mitigation Using Layered Composites." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70428.

Full text

Abstract:

Phononic crystals are composites with architected microstructure that exhibit superior shock mitigation properties which cannot be achieved through natural materials. In this study, the capability provided by layered phononic crystals for protection of structures subjected to near-contact detonation is investigated. To evaluate the protective performance of the layered composite, finite element simulation of a reinforced concrete (RC) column, with a layered composite attached to its surface, subjected to near-contact detonation is performed. As a reference case, the same RC column under the same near-contact detonation, without the layered composite, is also studied. Contours of damage and residual load carrying capacity of the RC column are analyzed for both cases. It is observed that due to optimized band-gap in the composite, high frequency components of the shock wave are filtered, while the low frequency components of the shock front are highly scattered. Therefore, the intense shock front with large peak overpressure and short duration gets dispersed and transforms into a wave with a longer duration and lower peak overpressure. Comparing the damage pattern in the protected RC column with the bare column, high level of protection provided by the layered composite is demonstrated. This study provides insight on how stress waves can be controlled through microstructural design of phononic crystals through topology optimization to achieve a desired dynamic and structural response.

APA, Harvard, Vancouver, ISO, and other styles

10

Yuan, Fuping, Liren Tsai, and Vikas Prakash. "Spall Strength of S2-Glass Fiber Reinforced Polymer Composites." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15378.

Full text

Abstract:

The utilization of layered heterogeneous material systems in the development of armor provides a potential for a great improvement in ballistic performance in a variety of lightweight armor applications. Some of the notable recent examples demonstrating the success of synthetic heterogeneous material systems include composite materials with organic matrices reinforced by glass fibers to achieve lightweight and enhanced ballistic resistance. In the present study, a series of plate impact experiments were performed on two S2-glass fiber reinforced polymer composites (GRP) with different resin content for their promising potential in future combat vehicle defense system. GRP has excellent strength along its fiberglass directions, however, the cohesion between fiberglass layers and its resin matrix is not strong and spall usually occurs during a typical impact process. The objective of the present study is to investigate: (a) dispersion and attenuation of shock-waves in two GRP composites; (b) the spall (delamination) strength of the two GRP composites both under compression and pressure-shear shock wave conditions. The GRP specimens were shock loaded by utilizing A1 7075-T6 flyer plates to around 2 GPa; the thickness of flyer and target for each experiment was carefully designed to produce a state of tension near the center of the GRP target plates. Normal plate impact, and combined pressure and shear experiments with skew angles ranging from 12o to 20o, were performed to study the effects of normal compression and combined compression and shear on the GRPs' spall strength. The measured spall strength as a function of the applied shear strain and the normal stress was used to develop a 3-dimensional failure surface. The results indicate that the spall strength of GRP decreases with increasing compressive stress; the addition of shear stress was found detrimental to the spall strength of GRP.

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Composite materials. Stress waves"

1

Tasdemirci, Alper, Ian W. Hall, Bazle A. Gama, and Mustafa Guden. The Effects of Layer Constraint on Stress Wave Propagation in Multilayer Composite Materials. Fort Belvoir, VA: Defense Technical Information Center, September 2004. http://dx.doi.org/10.21236/ada427963.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Weitsman, Y. Residual-Stress Induced Damage in Composite Materials. Fort Belvoir, VA: Defense Technical Information Center, April 1985. http://dx.doi.org/10.21236/ada164191.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Varley, E. Interaction of Large Amplitude Stress Waves in Layered Elastic-Plastic Materials. Fort Belvoir, VA: Defense Technical Information Center, February 1985. http://dx.doi.org/10.21236/ada153519.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Salamo, Gregory J. Nondestructive Real-Time Sensing of Stress Defects, and Flaws in Composite Materials. Fort Belvoir, VA: Defense Technical Information Center, August 1996. http://dx.doi.org/10.21236/ada313729.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Thornell, Travis, Charles Weiss, Sarah Williams, Jennifer Jefcoat, Zackery McClelland, Todd Rushing, and Robert Moser. Magnetorheological composite materials (MRCMs) for instant and adaptable structural control. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38721.

Full text

Abstract:

Magnetic responsive materials can be used in a variety of applications. For structural applications, the ability to create tunable moduli from relatively soft materials with applied electromagnetic stimuli can be advantageous for light-weight protection. This study investigated magnetorheological composite materials involving carbonyl iron particles (CIP) embedded into two different systems. The first material system was a model cementitious system of CIP and kaolinite clay dispersed in mineral oil. The magnetorheological behaviors were investigated by using parallel plates with an attached magnetic accessory to evaluate deformations up to 1 T. The yield stress of these slurries was measured by using rotational and oscillatory experiments and was found to be controllable based on CIP loading and magnetic field strength with yield stresses ranging from 10 to 104 Pa. The second material system utilized a polystyrene-butadiene rubber solvent-cast films with CIP embedded. The flexible matrix can stiffen and become rigid when an external field is applied. For CIP loadings of 8% and 17% vol %, the storage modulus response for each loading stiffened by 22% and 74%, respectively.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!