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4 edition of Mechanical properties of degraded PMR-15 resin found in the catalog.

Mechanical properties of degraded PMR-15 resin

Mechanical properties of degraded PMR-15 resin

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Published by National Aeronautics and Space Administration, Lewis Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], Springfield, VA .
Written in English


Edition Notes

Other titlesMechanical properties of degraded PMR 15 resin.
StatementLuis C. Tsuji and Hugh L. McManus, Kenneth J. Bowles.
Series[NASA technical memorandum] -- NASA/TM-1998-208487., NASA technical memorandum -- 208487.
ContributionsMcManus, Hugh L. N., 1958-, Bowles, Kenneth J., Lewis Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17593135M
OCLC/WorldCa41240231

Weathering of Polymers. A effect elongation epoxy resins exposed factor fibre film filter first fluorescent groups HDPE homopolymer hot/dry hot/wet humidity hydroperoxides impact strength increase influence infrared Innisfail Kunst lamp LDPE materials mechanical properties modified moisture molecular weight natural rubber nitrile. Early epoxy vitrimers in the literature rely on an inequivalent epoxy/anhydride stoichiometry and a large amount of catalyst to achieve a decent transesterification rate within the crosslinked network. This design approach raises a number of concerns such as poor miscibility of the catalyst with other ingredients, poor mechanical properties owing to insufficient crosslinking, the toxicity of. Characterization of model compounds, monomers, resin solutions and cure cycles of PMR polyimide are performed. Successful separation of various reaction products is also accomplished by liquid chromatography. The PMR cure analysis is performed by fourier transform spectroscopy and gas chromatograph - mass spectrometry.


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Mechanical properties of degraded PMR-15 resin Download PDF EPUB FB2

MECHANICAL PROPERTIES OF DEGRADED PMR RESIN Luis C. Tsuji, _ Hugh L. McManus, _ and Kenneth J. Bowles 2 National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio SUMMARY Thermo-oxidative aging produces a nonuniform degradation state in PMR resin.

A surface layer, usually attributed to oxidative degradation, forms. Thermo-oxidative aging produces a non-uniform degradation state in PMR resin. While thermal degradation occurs throughout the material, oxidative degradation occurs only where oxygen diffuses into the material.

This produces an oxidized surface layer that has different properties from the unoxidized inner Size: 2MB. PMR is a polymer resin for glass and carbon reinforced composites used for high temperature, civilian and military aerospace applications.

The harsh environments of PMR applications lead to long term structural degradation and, in turn, impact the readiness capabilities of the : Grant W. Robinson. Mechanical properties of degraded PMR resin Thesis (S.M.)--Massachusetts Institute of Technology, Dept.

of Aeronautics and Astronautics, February Includes bibliographical. Abstract Thermo-oxidative aging produces a non-uniform degradation state in PMR resin. A surface layer, usually attributed to oxidative degradation, forms.

This surface layer has different properties from the inner material. Thermo-oxidative aging produces a nonuniform degradation state in PMR resin. A surface layer, usually attributed to oxidative degradation, forms. This surface layer has different properties from the inner material.

A set of material tests was designed to separate the properties of the oxidized surface layer from the properties of interior : Luis C. Tsuji. NANOMECHANICAL CHARACTERIZATIONS OF HIGH TEMPERATURE POLYMER MATRIX COMPOSITE RESIN: PMR "NANOMECHANICAL CHARACTERIZATIONS OF HIGH TEMPERATURE POLYMER MATRIX COMPOSITE RESIN: PMR POLYIMIDE" ().

University of Kentucky Master's Theses. Figure Spatial variability of mechanical properties of oxidized. Achieving a complete curing of biocomposites without damaging fibers is very challenging. This study assesses the impact of processing upon the mechanical properties of a unidirectional flax reinforced epoxy composite and identifies which component (resin, reinforcement or interphase) is the most sensitive to post-curing at high temperature (, or °C).Cited by: Mechanical and thermal properties of composites, consisted of unsaturated polyester resin, reinforced by different kinds of natural materials (Orange peels and Date seeds) and industrial materials.

mechanical properties of polyester resin used as matrix for the polymer composites to determine parameters, such as tensile and compressive responses, fracture toughness, fracture energy and flexural properties.

Experimental Materials. The resin used for moulding sheets of resin was based on a low-viscosity unsaturated polyester resinFile Size: KB. Mechanical properties of degraded PMR resin. By Luis C. (Luis Christophe) Tsuji. Abstract. by Luis C. (S.M.)--Massachusetts Institute of Technology, Dept.

of Aeronautics and Astronautics, February Includes bibliographical references (leaves )Author: Luis C. (Luis Christophe) Tsuji. Mechanical properties of degraded PMR resin (OCoLC) Microfiche version: Tsuji, Luis C. (Luis Christophe), Mechanical properties of degraded PMR resin Mechanical properties of degraded PMR-15 resin book Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File.

Mechanical properties of degraded PMR resin (OCoLC) Online version: Tsuji, Luis C. (Luis Christophe), Mechanical properties of degraded PMR resin (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors /. This article reports the study of rate-dependent mechanical properties of thermal-oxidized PMR polyimide resins with a nanoindenter.

A Mechanical properties of degraded PMR-15 resin book of PMR resin specimens have been isothermally aged at various temperatures, times, and pressures. The strain rate sensitivity of oxidized surface layer obtained at each aging condition has been determined from nanoindentation creep Cited by:   The resin is elastomer modified to promote toughness.

The physical and mechanical properties of the A and resins provided by the manufacturer (16) are listed in Table 1. TABLE 1. Physical and mechanical properties of vinylester A and resins (16). The alloy composition of Zr 54 Al 17 Co 29 with high glass forming ability (GFA) in the Zr-Al-Co system was predicted by using the multiple binary eutectic clusters from the phase diagram.

Then the microalloying effects of Ta on the microstructure, thermal properties, mechanical properties, and corrosion resistance of (Zr 54 Al 17 Co 29) x Ta x (x = 0, 1,2,3) bulk amorphous Cited by: 5.

The performance of PMR-based structures depends on the mechanical durability of PMR resins at elevated temperatures, including creep and stress relaxation. In this work, the creep behavior of. The time-dependent mechanical behavior of the PMR polymer is also strongly affected by temperature.

The elastic modulus decreases and the departure from quasi-linear behavior is accelerated with increasing temperature. Stress levels in the region of inelastic flow decrease as the temperature by: 4.

Creep and high strain rate mechanical properties, shrinkage strain, and thermal properties of a bismaleimide neat resin after exposure to a high temperature in air were evaluated and compared with the corresponding properties for a pristine resin.

Under tension at a strain rate of 6×10−4 s−1, the Young’s modulus decreases and Poisson’s ratio increases with temperature, measured up to Cited by: Prolific polyimides.

Thirty years ago, the first polyimides were formulated in U.S. Air Force and NASA-funded programs. These polymerized monomeric reactant (PMR) resins, based in aromatic dianhydride ester acid and aromatic diamine chemistry and polymerized through solvent addition, eventually became aerospace industry-standard PMR and PMR-II formulations.

The databases of engineering properties are the most comprehensive. PMR resins and prepregs are commercial products, routinely offered by several prepreg manufacturers. Finally, the price of PMR prepregs is relatively low--typically ranging from $80 to $/lb, depending upon the type of reinforcement and quantity purchased.

There is a correlation between physical and mechanical properties and filler content weight and size in composite resins. Following increasing filler particle size an increase in stress concentration and decrease in flexural strength is observed.(3) In addition to correlation existed between elastic moduli and filler content fraction of composite resin, the shape and size seem to be fine Cited by: 7.

Degradation process occurs due to the influence of thermal, chemical, mechanical, radiative and biochemical factors occurring over a period of time resulting in deterioration of mechanical properties and colour of polymers.

The degradation occurs due to changes accompanying with the main backbone or side groups of the by:   In this research the effects of UV radiation on mechanical properties of glass/polyester composites were studied.

Since the photo degradation is a surface mechanism and is restricted to degradation of mechanical properties of resin (fiber is not degraded), this research is focused on resin by: Books Journals Engineering Research. Applied Mechanics and Materials Advances in Science and Technology International Journal of Engineering Research in Africa Mechanical Engineering Bioscience and Medicine Manufacturing Electronics.

ity, PMR composites also display good thermal-oxidative stability, mechanical properties, processability and low costs, which makes it a material for suitable manufacturing aircraft structures.

uses the reverse DielsPMR -Alder (RDA). PMR can also be formualted into adhesives and coatings, and offers easy composite processing, excellent mechanical property retention for long-term use at temperatures up to °C ( °F), and is relatively inexpensive. As such, PMR is widely regarded as a leading high-temperature polymer matrix composite for aircraft engine components.

Vinyl ester (VE) resin inherently has intrinsic brittleness due to its high cross-link density. To improve mechanical performance, micro/nano fillers are widely used to modify this matrix. In present study, glass fiber in submicron scale at low contents was added into VE to prepare submicron composite (sMC).

The impact resistance of un-notched sMC degraded with the increase of sGF content Cited by: 1. The inelastic deformation behavior of PMR neat resin, a high-temperature thermoset polymer, was investigated at ° C ⁠.The experimental program was designed to explore the influence of strain rate on tensile loading, unloading, and strain recovery by: 2.

Vol.9, No.3 Mechanical Properties of Epoxy Resin – Fly Ash Composite Dough preparation The required mixture of resin & hardner were made by mixing them in () parts in a beakerFile Size: KB. @article{osti_, title = {Thermo-oxidative stability studies of PMR polymer matrix composites reinforced with various fibers}, author = {Bowles, K.J.}, abstractNote = {An experimental study was conducted to measure the thermo-oxidative stability of PMR polymer matrix composites reinforced with various fibers and to observe differences in the way they degrade in air.

Unsaturated polyester resins are the most commonly used for the composites industry. Polyester resins have a good balance of mechanical, electrical and chemical properties. The polyester resins are mainly used in glass fibre profiles.

Typical mechanical properties of the polyester/glassfibre profiles are described in the following table. Hydrophilic nature of epoxy polymers can lead to both reversible and irreversible/permanent changes in epoxy upon moisture absorption.

The permanent changes leading to the degradation of mechanical properties due to combined effect of moisture and elevated temperature on EPONNanomer IE, and Somasif MAE clay-epoxy nanocomposites are investigated in this by: This is the first book to combine chemistry with techniques of preserving archaeological wood.

Among the topics discussed in its 17 chapters are the chemical composition of wood and changes brought about by the decay process, biopredators, radiation curing, freeze-drying, chemical preservation techniques, museum environments, the ethics of conservation, and value systems for choosing among the.

The paper titled "the impact of seasoning conditions on mechanical properties of modified and unmodified epoxy adhesive compounds" deals with testing and epoxy resin, Epid cured with two different curing agents, IDA and Z1 and adding calcium by: 4.

The basic oxidation model is taken from existing work in the literature, which was used to simulate the oxidation behavior of neat PMR resin. The governing equations and the finite element formulation for the model are described as well as approaches for determining the various effective by: 9.

@article{osti_, title = {Mechanical properties of Hysol EA structural adhesive}, author = {Guess, T R and Reedy, E D and Stavig, M E}, abstractNote = {Dextor`s Hysol EA is a room temperature curable paste adhesive representative of the adhesives used in wind turbine blade joints.

A mechanical testing program has been performed to characterize this adhesive. In addition, tensile and bending tests of both dry and wet composite samples were conducted and the results indicated that water absorbed in composite specimens degraded their mechanical properties.

The tensile strength and modulus of the composites reinforced w 30, 45 wt % wood powder decreased by %, %, % and %, %. Properties of M40j Carbon/Pmr-II Composites Fabricated with Desized and Surface Treated Fibers: Characterization of M40j Desized and Finished Fiber [Allred, Ronald E., Nasa Technical Reports Server (Ntrs), Et Al] on *FREE* shipping on qualifying offers.

Properties of M40j Carbon/Pmr-II Composites Fabricated with Desized and Surface Treated Fibers: Characterization of M40j Author: Ronald E. Allred. mechanical properties of the rehabilitated line are important critera for resin selection and the deter-mination of a project’s success.

Municipalities often have minimum requirements the CIPP must meet (Table 1). Resin suppliers normally report mechanical properties from laboratory-generated samples while the contractor measures results. Mechanical properties of resin containing microcapsules of various concentrations: (A) flexural strength, and (B) elastic modulus (mean ± sd; n = 6).

0% refers to resin containing 0% microcapsules, 5% refers to resin containing 5% microcapsules, and so on. Addition up to 15% of microcapsules resulted in no significant decrease in strength and Cited by: The paper presents the effect of fiber length on the mechanical properties and water absorption of bamboo fiber/polystyrene-modified unsaturated polyester composites.

The fiber length varied from mm to 15 mm at the fiber volume fraction ofand Author: S Sugiman, P D Setyawan, B Anshari. In most materials, however, the actual observed material properties - strength, electrical conductivity, etc. - are degraded very substantially by the occurrence of defects in their structure.

For example, high strength steel typically fails at about 1% of its theoretical breaking : Unidym, Inc.