Keyword: Composite materials

Briefs: Materials

Windows that absorb x rays and are transparent to visible light can be made by compression molding of tantalum oxide/polymer composite materials. The main x-ray-absorbing medium in these windows is tantalum...

Briefs: Materials
Research on Life-Prediction Methods for MMCs— Phase I

A report describes the completed first phase of a NASA/industry cooperative program of research on metal-matrix composites (MMCs) as lightweight, strong, high- temperature-resistant materials for use in future aircraft engines. The first phase of the research included assessment of life-...

Briefs: Materials

A class of developmental membrane electrolyte materials for methanol/air and hydrogen/air fuel cells is exemplified by a composite of (1) a melt-processable polymer [in particular,...

Briefs: Materials

Internal-combustion engines would be constructed with cylinders and ringless pistons made of lightweight carbon/carbon composite materials, according to a proposal. This proposal is a...

Briefs: Physical Sciences

A relatively simple and inexpensive method of fabricating a temperature-compensation element for high- temperature strain gauges has been devised. This element, connected in...

Briefs: Materials

Flexible, compact, hermetically sealed piezoceramic actuators with robust electrical leads have been developed for use in actively controlling aerostructures to suppress noise, vibration, and flutter on...

Briefs: Materials
Nanolaminate Mirrors With Integral Figure-Control Actuators

A report discusses the development of thin-shell curved mirrors comprised of metallic multilayer nanolaminate substrates that contain integral inplane actuators for controlling surface figure with micron-level precision. These mirrors, intended for incorporation into scientific imaging...

Briefs: Electronics & Computers

Printed-wiring boards (PWBs) that are especially suitable as substrates for highly reliable, lightweight electronic circuits for aircraft and spacecraft have been developed. Like...

Briefs: Photonics/Optics
Multi-Screen-Image- and Catalog-Viewing Program

A computer program enables the single- or multi-screen display of multispectral, multiresolution images — especially astronomical ones — stored as sets of data that range upward in size from hundreds of gigabytes. In cases of multi-screen displays, the software synchronizes the screens so that...

Briefs: Materials
Ceramics Made From Wood

The term “ecoceramics” (a contraction of “environment-conscious ceramics”) denotes a class of ceramics made partly from wood-based products, which can include natural wood, sawdust, cardboard, and/ or paper. In addition to the environmental advantage of renewability of the carbonaceous ingredients, the concept of...

Briefs: Materials

Latently reactive end caps have been investigated as improved means to increase the thermo-oxidative stability of polyimides of the polymerization of monomeric reactants (PMR) type,...

Briefs: Materials

An additional class of end-cap compounds that increase the thermo-oxidative stability of polyimides of the polymerization of monomeric reactants (PMR) type has been invented. The...

Briefs: Materials
Hybrid Composite Structures Made From Polybenzoxazole Fibers

Hybrid composite-material (fiber/matrix) structures of a proposed type would incorporate recently developed polybenzoxazole (PBO) fibers that feature high strengths and high moduli of elasticity and which can be made in much thinner sections than are possible with graphite fibers. The...

Briefs: Materials

A technique for holding sensor lead wires in place on substrates made of SiC-based monolithic ceramic or SiC/SiC fiber-reinforced ceramic-matrix composite materials involves...

Briefs: Materials
Improved Polymeric Composite Materials for Dental Fillings

Composite materials that include combinations of metal oxide and silica nanoparticles in polymeric matrices have been invented for primary use as dental fillings, dental and bone adhesives, and the like. There have been previous efforts to develop polymeric replacements for the amalgam...

Briefs: Physical Sciences

A process and a laboratory setup to implement the process (see figure) have been devised to enable the acquisition of time-resolved data on the thermal decomposition of a specimen of...

Briefs: Materials
High-Performance POSS-Modified Polymeric Composites

Epoxies and/or cyanate esters that incorporate polyhedral oligomeric silsesquioxane (POSS) compounds are undergoing development at Air Force Research Laboratory (AFRL). These formulations are expected to be useful as high-performance matrix resins for advanced, lightweight fiber/matrix...

Briefs: Materials
Lightweight Composite-Material Tanks for Cryogenic Liquids

A lightweight composite-material tank suitable for the storage and transport of liquid oxygen and other cryogenic liquids has been developed. The tank includes a metallic liner compatible with liquid oxygen, a graphite/ epoxy overwrap, an insulating layer of lightweight polyurethane...

Briefs: Test & Measurement

Two improved methods have been developed for testing continuously rolled blankets and blanketlike thermal-insulation materials typically used in cryogenic vacuum systems. Both...

Briefs: Software
Software for Multidisciplinary Analysis of Graded Composites

The Coupled Structural/Thermal/Electromagnetic (CSTEM) computer program implements an integrated multidisciplinary approach to analysis and optimization of the designs of graded composite-material structures. The name of the program reflects recognition of the coupling among thermal,...

Briefs: Manufacturing & Prototyping

Glass plates are used as cure plates in a modified process for the fabrication of flat composite-material (matrix/fiber) panels. In the unmodified previous version of the process the...

Briefs: Materials
Development of Progressive-Failure-Analysis Software

A report discusses the development of the GENOA-PFA computer program, which was described in "Software for Simulating Progressive Fracture in Braided PMCs" (LEW-16845), NASA Tech Briefs, Vol. 24, No. 3 (March 2000), page 52; and "Update on a Progressive-Failure-Analysis Software System...

Briefs: Physical Sciences
Tribology for Aerospace Applications

"Tribology for Aerospace Applications" is a textbook and reference source written for designers of rotating machinery; users and designers of such mechanical components as bearings, gears, and seals; tribologists; university and industrial researchers; and students of machine design. The book incorporates...

Briefs: Materials

Lightweight shields for electromagnetic interference (EMI) can now be fabricated from composites of (1) electrically conductive fibers made of bromine-intercalated graphite in (2) matrices...

Briefs: Materials
Composite-Material Pipes for Corrosive and Cryogenic Liquids

A flexible design concept and an associated method of fabrication have been conceived as means to satisfy growing demands for lightweight composite-material pipes for corrosive and cryogenic liquids. The design concept and method can be applied to produce piping systems capable of...

Briefs: Materials

A method of fabricating composites of pretreated silicon carbide fibers in silicon carbide matrices provides for the formation of improved boron nitride fiber/matrix interfacial layers....

Briefs: Energy
Oxygen Batteries Based on a Solid Polymer Electrolyte

Scientists have developed a derivative of the lithium-ion cell that could prove useful in spaceflight and commercial applications in which it is planned to use oxygen batteries based on solid polymer electrolytes. This derivative cell, which contains a solid polymer electrolyte and an oxygen...

Briefs: Materials

Polyimide-matrix/carbon-fiber composite materials with enhanced thermo-oxidative stability can be made from carbon fibers that have been coated with suitably formulated reactive...

Briefs: Materials
Tape-Spring Reinforcements for Inflatable Structural Tubes

Lightweight, inflatable tubular structural components containing tape-spring reinforcements are undergoing development. The basic (without tape-spring reinforcement) tubular components are made, variously, of aluminum laminates or composite materials and are under consideration for use...