Keyword: Composite materials

Briefs: Materials
Burn-Resistant, Strong Metal-Matrix Composites

Ceramic particulate fillers increase the specific strengths and burn resistances of metals: This is the conclusion drawn by researchers at Johnson Space Center's White Sands Test Facility. The researchers had theorized that the inclusion of ceramic particles in metal tools and other metal objects...

Briefs: Manufacturing & Prototyping

A dry process has been invented as an improved means of manufacturing composite prepreg tapes that consist of high- temperature thermoplastic polyimide resin matrices reinforced...

Briefs: Materials

An explicit material model that uses predicted pressure in the pores of a carbon-cloth phenolic (CCP) composite has been developed. This model is intended to be used within a...

Briefs: Materials
Flexible Composite-Material Pressure Vessel

A proposed lightweight pressure vessel would be made of a composite of high-tenacity continuous fibers and a flexible matrix material. The flexibility of this pressure vessel would render it (1) compactly stowable for transport and (2) more able to withstand impacts, relative to lightweight pressure...

Briefs: Physical Sciences

Hot-film sensors, consisting of a metallic film on an electrically nonconductive substrate, have been used to measure skin friction as far back as 1931. A hot film is maintained at...

Briefs: Information Technology

A set of special digital all-pass finite- impulse- response (FIR) filters produces phase shifts equivalent to delays that equal fractions of the sampling or clock period of a...

Briefs: Mechanical & Fluid Systems

Curved mirrors of a proposed type would comprise lightweight sheets or films containing integral, biologically inspired actuators for controlling their surface figures. These mirrors...

Briefs: Mechanical & Fluid Systems

An experiment and calculation have demonstrated the feasibility of a technique of compact storage of paraboloidal mirrors made of thin composite-material (multiple layers of carbon...

Briefs: Software
Software Computes Tape-Casting Parameters

Tcast2 is a FORTRAN computer program that accelerates the setup of a process in which a slurry containing metal particles and a polymeric binder is cast, to a thickness regulated by a doctor blade, onto fibers wound on a rotating drum to make a “green” precursor of a metal-matrix/fiber composite...

Briefs: Mechanical & Fluid Systems

Improved energy- absorbing wheels are under development for use on special-purpose vehicles that must traverse rough terrain under conditions (e.g., extreme cold) in which rubber pneumatic tires would...

Briefs: Materials

The performance of a composite part is primarily determined by the orientation of fibers in the plies. Designers wishing to exploit the full potential of...

Briefs: Materials

High-energy-density alkaline electrochemical capacitors based on electrodes made of transition-metal nitride nanoparticles are undergoing development. Transition-metal nitrides (in...

Briefs: Software
ICAN/JAVA: Integrated Composite Analyzer Recoded in Java

The Integrated Composite Analyzer (ICAN) computer program, originally written in the FORTRAN language, has been completely recoded in Java to make it more widely usable. Whereas the original ICAN could be executed on only a limited number of platforms, ICAN/JAVA is compatible with almost...

Briefs: Materials

Polymeric electrolytes for rechargeable lithium-based electrochemical cells and batteries would be made by blending and complexing cyanoresins with lithium salts, according to a...

Briefs: Physical Sciences

Scanning thermography is a noncontact, nondestructive technique that makes it possible to find defects hidden inside structural components in a variety of settings. Scanning thermography can be used to perform...

Briefs: Software
Computer Code for Analyzing Piezoelectric Composite Shells

SMARTSHELL is a finite-element computer program for analyzing composite-material propulsion-system structural components (including shells) that are characterized as “smart” because they contain integral piezoelectric sensors and/or actuators. The program implements a unique...

Briefs: Materials

Pipes made of graphite-fiber/epoxymatrix composites have been shown to be suitable as conduits for liquid hydrogen. Conceived for as replacements for heavier metallic liquid-hydrogen feedlines in...

Briefs: Software
Analyzing Loads and Strains in Polymer-Matrix Composites

Strain Rate Dependent Analysis of Polymer Matrix Composites (STRANALPMC) is a computer program for analyzing strain-rate-dependent, nonlinear deformation and failure responses of composite materials in which the matrices are ductile polymers. Modified versions of the Ramaswamy-Stouffer...

Briefs: Materials
Analysis of Multilayer Thermal Insulation for Reentry

A paper presents a study of multilayer thermal insulations for protecting spacecraft against aerodynamic heating during reentry into a planetary atmosphere. A multilayer insulation considered in the study comprised (1) thin ceramic/composite foils coated with gold for high reflectance...

Briefs: Photonics/Optics

Carbon-composite submounts tipped with diamond are being developed as improved means of dissipating heat generated in high-power laser diodes. Copper is the traditional heat-sinking...

Briefs: Materials

An ablative composite coating has been developed to protect a steel substrate against a short-duration exposure to supersonic stream of hot gases and molten ceramic particles. In the...

Briefs: Manufacturing & Prototyping
Process for Rapid Prototyping in Ceramic-Matrix Composites

The ceramic-composite advanced tow- placement (CCATP) process is a means of laying down continuous-fiber-reinforced, ceramic-matrix composite (CMC) materials in patterned layers to form objects that could have complex three-dimensional shapes. The CCATP process is a member of the growing...

Briefs: Manufacturing & Prototyping
Process for Rapid Prototyping in Ceramic-Matrix Composites

The ceramic-composite advanced tow-placement (CCATP) process is a means of laying down continuous-fiber-reinforced, ceramic-matrix composite (CMC) materials in patterned layers to form objects that could have complex three-dimensional shapes. The CCATP process is a member of the growing...

Briefs: Materials

Some changes have been made in the fabrication of PSSA/ PVDF-based membrane/electrode assemblies for direct methanol fuel cells. The effect of the changes is to improve the...

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...