Download or read book Evaluation of the Effect of a Custom Fiber Surface Treatment on the Adhesion Level in a Polymer Based Composite Using the Single Fiber Fragmentation Test written by D. Bradford and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past several years, a number of investigations have focused on improved fiber surface treatments as well as the development of micromechanical experimental techniques to accurately evaluate the fiber/matrix adhesion level. The aim of this study was to evaluate the effect of a custom fiber surface treatment on the fiber/matrix adhesion level of a carbon fiber reinforced, polymer matrix composite material. Single fiber fragmentation tests were performed on specimens produced using EPON 828 resin and AU-4 fibers, AS-4 fibers, and AU-4 fibers that were treated with a custom fiber surface treatment known to lead to direct chemical reaction with the EPON 828 resin. Qualitative inspection of the birefringent stress patterns produced by the custom treated fiber indicate a high level of fiber/matrix adhesion, greater than the adhesion exhibited by either of the two as received fiber types. In addition, the custom treated fibers produced an average fiber fragment length approximately 23% shorter than the AS-4 specimens, indicating a rather significant increase in adhesion level for the custom treated fibers over the commercially treated fibers. Calculated interfacial shear strength values follow the same trend as was seen during the evaluation of the average fragment length values.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 2000 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Directory of Graduate Research written by and published by . This book was released on 2001 with total page 1850 pages. Available in PDF, EPUB and Kindle. Book excerpt: Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.
Download or read book Evaluation of Fiber matrix Adhesion Using the Single Fiber Fragmentation Test written by David Henry Bradford and published by . This book was released on 1997 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Interfacial Properties on the Fiber Fragmentation Process in Polymer Matrix Composites written by Voleti, SR. and published by . This book was released on 2006 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber Fragmentation test or Single Fiber Composite test (SFC) has been widely used to characterize the interfacial behavior in composites. Though it is accepted that SFC gives useful information about the interfacial bond quality and the fiber strength, there is no clear consensus on how to interpret the data and quantify the interfacial properties. In this paper, the fiber fragmentation test is modeled with the objective of studying the effect of interfacial bond strength and post-debonding frictional effects on the progress of the fragmentation process. The load transfer at the fiber-matrix interface is modeled using the shear-lag principles and the statistical variation of fiber strength is incorporated using Weibull theory. A parametric study of the variation of interfacial shear properties on the mean fragment length and debond progression with applied strain is conducted. It is found that in the case of weak interfaces saturation of fiber fragments occurs at much lower applied strain values and is usually associated with extensive debonding. The numerical simulation shows that the fragmentation results are very much sensitive to the frictional effects as it controls the debonded length. The results from the model are correlated with experimental data to validate the model and for extracting the interfacial properties from the test data.
Download or read book Effect of Moisture on the Interfacial Shear Strength written by BA. Pratt and published by . This book was released on 1997 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of absorbed moisture on the interfacial strength of a carbon fiber/epoxy matrix composite has been studied using the single fiber fragmentation test. The absorption of 1.40% moisture produced a reduction less than 20% in the interfacial shear strength. This reduction in interfacial strength may be associated with a reduction in the residual compressive stresses at the fiber/matrix interface associated with the cooldown from the curing temperature, a weakening of the chemical adhesion, or a softening of the matrix giving failure by interphase yielding. These results suggest that long-term durability of carbon fiber/epoxy matrix composites in seawater may not be much affected by absorbed seawater.
Download or read book The Effect of Interphase Properties on Adhesion in Polyphenylene Sulfide carbon Fiber Composites written by Gregory Scott Fisher and published by . This book was released on 1994 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Single Fiber Pull out Test for Fiber epoxy Adhesion Evaluation of Surface Modified Kevlar written by Atsuo Miyake and published by . This book was released on 1983 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluating Surface Treatment Effects on Interfacial Bond Strength Using Dynamic Mechanical Analysis written by RJ. Cano and published by . This book was released on 1993 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three series of torsional dynamic mechanical analysis (DMA) tests were conducted on unidirectional carbon/epoxy composites to determine differences in interfacial bond strength. For the first series, composites were manufactured with PAN-based and pitch-based carbon fibers. The fibers had a proprietary surface treatment. For the second series of tests, the composites were made with four grades of pitch-based carbon fibers. Two different methods of surface treatment were used on the fibers. As a comparison, short beam shear tests were conducted on the composites made with fibers which had different surface treatments. The final series of tests were conducted on composite samples made from one grade of pitch-based fibers with four different fiber volume fractions. All samples were made using the same matrix material. Dynamic mechanical analysis was able to clearly differentiate between the fiber/matrix bond strength of pitch-based and PAN-based fibers. The interlaminar shear strength correlated well with the DMA results, indicating that DMA can measure the effectiveness of various surface treatments. The dynamic mechanical loss modulus increased with increasing fiber volume fraction or total surface area.
Download or read book Tunable Interfaces in Fiber Reinforced Polymer Composites Using Plasma Surface Treatments written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibers incorporated into polymer matrices suffer from poor adhesion at the fiber-resin interface. In ballistic materials such as body armor, it is imperative that the fiber-resin interface is strengthened for superior energy absorbing capabilities. To address this need, fibers are typically subjected to surface modifications. The overall aim of this work is to establish a methodology of controlling the interfacial adhesion by controlling the degree of chemical bonding between the fiber and the resin. In this study, plasma surface treatments were applied to ultra high molecular weight polyethylene (UHMW-PE) fibers to introduce chemical functionalities to promote covalent bonding. Nitrogen and oxygen plasmas were used and changes imposed by the plasma were characterized using surface analytical techniques. The adhesional strength and energy absorption of the plasma-modified fibers/epoxy interface were assessed using a single-fiber microdroplet shear test. FTIR and XPS reveal the existence of four main chemical groups - hydroxyl, carboxylic, carbonyl and amine groups. Characterization of the interface showed that a six-fold increase of the interfacial shear strength (IFSS) can be attained from plasma treating the fibers.
Download or read book Numerical Analysis of the Single Fiber Fragmentation Test Including the Effect of Interfacial Friction written by Enrique Graciani and published by . This book was released on 2010 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transverse Flexural Tests As a Tool for Assessing Damage to Pmr 15 Composites from Isothermal Aging in Air at Elevated Temperatures written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-04 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: To date, the effect of thermo-oxidative aging on unidirectional composite mechanical properties has been monitored by the measurement of interlaminar shear strength (ILSS) and either three or four point longitudinal flexural strength (LFS) of the composites being tested. Both results are affected by the fiber-to-matrix bonding, the former being dependent on the shear resistance of the interface and the latter on the degree of load sharing by the fibers through the fiber/matrix interface. Recently, fiber/matrix interfacial bond strengths have been monitored using a transverse flexural strength (TFS) test method. This test method was used to evaluate the effect of fiber surface treatment on the fiber/matrix bond. The interface bonding was varied in these tests using Hercules A-fibers with three-types of surfaces that produce bonds of poor, better, and good quality. The TFS was found not only to be sensitive to the bonding, but also to the aging time of unidirectional A-fiber/PMR-15 composites. This relationship reflects the mechanism by which the PMR-15 degrades during thermal aging. Bowles, Kenneth J. Glenn Research Center NASA-TM-105848, E-7293, NAS 1.15:105848 RTOP 510-01-50...
Download or read book Sustainable Composites for Aerospace Applications written by Mohammad Jawaid and published by Woodhead Publishing. This book was released on 2018-04-27 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sustainable Composites for Aerospace Applications presents innovative advances in the fabrication, characterization and applications of LDH polymer nanocomposites. It covers fundamental structural and chemical knowledge and explores various properties and characterization techniques, including microscopic, spectroscopic and mechanical behaviors. Users will find a strong focus on the potential applications of LDH polymer nanocomposites, such as in energy, electronics, electromagnetic shielding, biomedical, agricultural, food packaging and water purification functions. This book provides comprehensive coverage of cutting-edge research in the field of LDH polymer nanocomposites and future applications, and is an essential read for all academics, researchers, engineers and students working in this area. - Presents fundamental knowledge of LDH polymer nanocomposites, including chemical composition, structural features and fabrication techniques - Provides an analytical overview of the different types of characterization techniques and technologies - Contains extensive reviews on cutting-edge research for future applications in a variety of industries
Download or read book Electrospun Nanofibers written by Mehdi Afshari and published by Woodhead Publishing. This book was released on 2016-09-13 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrospun Nanofibers covers advances in the electrospinning process including characterization, testing and modeling of electrospun nanofibers, and electrospinning for particular fiber types and applications. Electrospun Nanofibers offers systematic and comprehensive coverage for academic researchers, industry professionals, and postgraduate students working in the field of fiber science. Electrospinning is the most commercially successful process for the production of nanofibers and rising demand is driving research and development in this field. Rapid progress is being made both in terms of the electrospinning process and in the production of nanofibers with superior chemical and physical properties. Electrospinning is becoming more efficient and more specialized in order to produce particular fiber types such as bicomponent and composite fibers, patterned and 3D nanofibers, carbon nanofibers and nanotubes, and nanofibers derived from chitosan. - Provides systematic and comprehensive coverage of the manufacture, properties, and applications of nanofibers - Covers recent developments in nanofibers materials including electrospinning of bicomponent, chitosan, carbon, and conductive fibers - Brings together expertise from academia and industry to provide comprehensive, up-to-date information on nanofiber research and development - Offers systematic and comprehensive coverage for academic researchers, industry professionals, and postgraduate students working in the field of fiber science
Download or read book Interlaboratory Study of Adhesion Using Voltage Contrast XPS written by JD. Miller and published by . This book was released on 1996 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: An interlaboratory study (ILS) was conducted to determine the utility and precision of a test method for measuring fiber/matrix adhesion of carbon fiber-reinforced polymer matrix composites. The test method is based on voltage contrast X-ray photoelectron spectroscopy (VCXPS). The technique provides a quantitative measure of the relative amount of exposed fiber and exposed matrix at the fracture surface of a failed composite specimen. Eleven laboratories participated in two rounds of interlaboratory testing. The first round or pilot run was conducted to familiarize laboratories with the technique. Each laboratory collected data on one of eight material variants to compare with data from the host laboratory. In the second round each laboratory analyzed different coupons from the same composite laminate. Repeatability and reproducibility statistics were calculated and demonstrated that the method has interlaboratory utility. Precision statistics were influenced by the heterogeneity of samples generated from a single-carbon fiber-reinforced polymer matrix composite laminate.
