Thermal and Mechanical Durability of Graphite-Fiber-Reinforced PMR-15 Composites PDF Download

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 10

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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781729196731
Category : Science
Languages : en
Pages : 30

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Extensive effort is currently being expended to demonstrate the feasibility of using high-performance, polymer-matrix composites as engine structural materials over the expected operating lifetime of the aircraft, which can extend from 18,000 to 30,000 hr. The goal is to develop light-weight, high-strength, and high-modulus materials for use in higher temperature sections of advanced 21 st century aircraft propulsion systems. To accomplish this goal, it is necessary to pursue the development of thermal and mechanical durability models for graphite-fiber-reinforced, polymer-matrix composites. Numerous investigations have been reported regarding the thermo-oxidative stability (TOS) of the polyimide PMR-15 (1-5). A significant amount of this work has been directed at edge and geometry effects, reinforcement fiber influences, and empirical modeling of high-temperature weight loss behavior. It is yet to be determined if the information obtained from the PMR-15 composite tests is applicable to other polyimide-matrix composites. The condensation-curing polymer Avimid N is another advanced composite material often considered for structural applications at high temperatures. Avimid N has better thermo-oxidative stability than PMR-15 (6), but the latter is more easily processed. The most comprehensive study of the thermo-oxidative stability of Avimid N neat resin and composites at 371 (infinity)C is found in Salin and Seferis (7). The purposes of the work described herein were to compare the thermal aging behavior of these two matrix polymers and to determine the reasons for and the consequences of the difference in thermal durability. These results might be of some use in improving future polymer development through the incorporation of the desirable characteristics of both polyimides. Bowles, Kenneth J. and McCorkle, Linda and Ingrahm, Linda Glenn Research Center NAS3-27351; RTOP 538-06-15

Author: KJ. Bowles
Publisher:
ISBN:
Category : Carbon fiber
Languages : en
Pages : 6

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Earlier work that reported relationships between compression properties and elevated-temperature aging duration and weight losses also pointed out the apparent influence of surface layer formation and growth on the retention of compression properties during extended aging times. Since that time, further studies have focused on evaluating the growth of the surface layer. The composition and features of this layer were found to change as the aging temperature changed. Microcracks and small voids initiated and advanced inward at all temperatures. Visible oxidation at the surface occurred only at temperatures above 260°C. Relationships between layer thickness, aging time, and temperature were evaluated and empirically formulated. Then, the compression properties were graphically related to the surface layer thickness with excellent correlation.

Author: K.L. Reifsnider
Publisher: CRC Press
ISBN: 9789054109600
Category : Technology & Engineering
Languages : en
Pages : 380

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Composite material systems are the basis for much of the natural world around us and are rapidly becoming the basis for many modern engineering components. A controlling feature for the general use of such systems is their damage tolerance, durability and reliability. The present book is a comprehensive cross section of the state of the art in the field of the durability of polymer-based, composite, and adhesive systems. As such, it is of special value to researchers concerned with the frontier of the field, to students concerned with the substance of the subject, and to the applied community concerned with the finding methodologies that make it possible to design safe and durable engineering components using material systems.

Author:
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ISBN:
Category :
Languages : en
Pages : 34

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Author: M. P. Hanson
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 20

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Composites were exposed in circulating and static air environments up to 589 K for a maximum of 1000 hours. Composites of HT-S, HM-S, Thornel 50S, and Fortafil 5-Y fiber and a new addition type polyimide resin were laminated in a matched-die mold. Flexural strengths, flexural modulus, and interlaminar shear strengths were determined at 297, 533, and 598 K after various durations of exposure. Composite and fiber weight loss characteristics were determined by isothermal gravimetric analysis in air. Properties of composites exposed and tested at the environment temperatures were compared with those determined under short-term exposure. A new short beam interlaminar shear fixture is described. Environmental effects of long-term ambient temperature exposure on the elevated temperature mechanical properties of graphite/polyimide composites are presented.

Author: H. Dardon
Publisher: CRC Press
ISBN: 9789058091031
Category : Technology & Engineering
Languages : en
Pages : 500

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The papers from these proceedings address experimental and analytical methods for the characterization and analysis of modern composite and adhesive systems. They have been produced to provide understanding that can be used to design safe, reliable engineering components.

Author: Yosif Golfman
Publisher: CRC Press
ISBN: 9781439836811
Category : Technology & Engineering
Languages : en
Pages : 339

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Optimization of aviation and space vehicle design requires accurate assessment of the dynamic stability and general properties of hybrid materials used in aviation parts. Written by a professional with 40 years of experience in the field of composite research, Hybrid Anisotropic Materials for Structural Aviation Parts provides key analysis and application examples to help the reader establish a solid understanding of anisotropic properties, theory of laminates, and basic fabrication technologies. Tools to ensure cost-effective, optimized fabrication of aircraft, satellites, space vehicles, and more... With a focus on analytic modeling and dynamic analysis of anisotropic hybrid materials used in structural parts, this book assesses how and why design mechanisms either work or fail. It describes how current manufacturing techniques can apply alternative electronic and ultrasonic systems to improve the strength of an aircraft’s parts, reduce vibrations, and counteract deicing effects, among other vital requirements. Presenting valuable case studies involving manufacturers such as Boeing and DuPont, this book covers topics including: Nano composites, impregnation processes, and stress/strain analysis New techniques for analyzing interlaminar shear distribution sandwich/carbon/fiber/epoxy technologies Non-destructive methods, control technological parameters, and the influence of technological defects Use of carbon–silicon nanotubes and ceramic technology Strength criteria and analysis, and composite life prediction methodologies Dynamic aspects and stability of jetliners and lattice aviation structures Interlaminar shear stress analysis and possible failure Fatigue strength and vibration analysis This volume offers a useful, informative summary of the cutting-edge work being done in the field of high-performance composite materials, including fiberglass and carbon. With coverage of topics ranging from stress analysis and failure prediction to manufacturing methods and nondestructive inspection technology, it provides unique information to benefit a new generation of composite designers, graduate students, and industry professionals working with high-performance structures.

Author: Young Kwon
Publisher: Springer Science & Business Media
ISBN: 0387363181
Category : Technology & Engineering
Languages : en
Pages : 634

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This book presents the state-of-the-art in multiscale modeling and simulation techniques for composite materials and structures. It focuses on the structural and functional properties of engineering composites and the sustainable high performance of components and structures. The multiscale techniques can be also applied to nanocomposites which are important application areas in nanotechnology. There are few books available on this topic.