Keyword: Composite materials

Briefs: Software

GENOA-PFA is a commercial version of the Composite Durability Structural Analysis (CODSTRAN) computer program, which simulates the progression of damage ultimately leading to...

Briefs: Physical Sciences

A technique for ultrasonic characterization of plates has been extended to tubes and curved structures in general. In this technique, as explained in more detail below, one performs...

Briefs: Materials
Protective Shells for Composite Overwrapped Pressure Vessels

White Sands Test Facility (WSTF) scientists have developed an energy-absorbing laminated shell that is a prototype of lightweight, inexpensive, and removable covers to shield and otherwise protect carbon-composite overwrapped pressure vessels (COPVs). Although COPVs are superior to...

Briefs: Materials

A laminated composite-material plate has been developed for use as a lightweight heat sink and mechanical support for rigid printed-circuit boards (PCBs) that hold surface-mounted...

Briefs: Materials

A method for protective packaging of multichip modules and related assemblies of microelectronic circuitry involves coating the assemblies with composite organic/inorganic layers...

Briefs: Materials
Tailoring Fiber/Matrix Interfaces Through Kirkendall Defects

In a proposed method of tailoring some of the mechanical properties of metal-matrix, oxide-matrix, and ceramic-matrix composite materials, Kirkendall defects (microscopic pores as described below) would be introduced into thin interfacial layers between the fibers and the matrices....

Briefs: Materials
Reducing Damage to Alumina Fibers in Metal-Matrix Composites

Coating alumina fibers with sputtered metal has been proposed as a means to enable the fibers to retain more strength when the fibers are incorporated into metal-matrix composites. If the alumina fibers could be made to retain more strength, then it would be possible to manufacture...

Briefs: Mechanical & Fluid Systems

A continuing program of research is directed toward the development of crashworthy composite-material fuselages for small aircraft. These fuselages are required not only to withstand...

Briefs: Electronics & Computers
Microplasmic Coating Shows High Resistance to Wear, Heat and Corrosion

The process of anodizing, or controlled oxidation, of aluminum and aluminum alloys is more than seven decades old. The primary intent of anodizing aluminum and aluminum-alloy parts is to protect the highly reactive surface against corrosion in aqueous environments, such as...

Briefs: Materials
Update on SiC Fiber/[MoSi₂-Matrix/Si₃N₄ Particle] Composites

A report presents updated information on the developments described in "MoSi2-Based Composite Materials for Aircraft Engines" (LEW-16617),NASA Tech Briefs, Vol. 22, No. 9 (September 1998), page 62. To recapitulate: Hybrid composites of (1) SiC-based fibers within (2)...

Briefs: Mechanical & Fluid Systems

Kinetic-energy-absorbing shrouds have been proposed to protect nearby persons and equipment against high-speed debris ejected by disintegrating machines. Examples of machines that...

Briefs: Materials

A computational methodology for predicting the initiation and propagation of failures in laminated matrix/fiber composite-material structures has been developed. The methodology...

Briefs: Materials
Program Predicts Uncertainties in Properties of CMCs

Probabilistic Ceramic Matrix Composite Analyzer (PCEMCAN) is a user-friendly computer program that predicts uncertainties in the mechanical and thermal properties of ceramic-matrix composite (CMC) materials. These materials are candidates for fabrication of structural components that will be...

Briefs: Materials

Improved aerogel-based thermal insulation systems have been developed to provide cost-effective and easier-to-handle alternatives to various types of multilayer insulation (MLI) and...

Briefs: Robotics, Automation & Control

The figure shows a robot arm that is essentially a miniature crane actuated by electroactive polymers. This mechanism has been constructed as part of a continuing effort to develop lightweight,...

Briefs: Materials

Improved zirconium- and hafnium-based ceramic composites have been invented in an effort to obtain better resistance to ablation at high temperature. These ceramics are suitable for use...

Briefs: Materials
Hybrid Composite Overwraps for Low-Pressure Tanks

Hybrid versions of the high-performance overwraps used on some low-pressure tanks have been proposed. The hybrid overwraps would weigh less than do the corresponding nonhybrid overwraps, as explained below.

Briefs: Materials
Repair of Composite-Overwrapped Pressure Vessels

Pressure vessels overwrapped with graphite-fiber-based composite materials that become damaged would be salvaged by a proposed repair technique. The need for the technique arises as follows: High-performance graphite-fiber-based composites are very susceptible to damage from impact or cutting....

Briefs: Materials
Polymeric Composite Damage Protective Overwraps for Composite Pressure Vessels

Damage-tolerant polymeric composite overwraps have been proposed for lightweight pressure vessels that are made of composites of graphite fibers in polymeric matrices. Graphite-fiber/polymer composites are vulnerable to impact damage; overwraps on the pressure...

Briefs: Manufacturing & Prototyping
Integrally Wound Skirt for Composite-Overwrapped Tank

The skirt that supports a composite-overwrapped tank would be made an integral part of the composite overwrap, according to a proposal. In current practice, the structure that supports a composite-overwrap tank usually includes a layer of rubber between the tank and its skirt. The rubber...

Briefs: Physical Sciences

Preforms (essentially, shaped mats) of single-crystal yttrium aluminum garnet (YAG) fibers can now be readily fabricated in net size and shape, with tailored orientation of...

Briefs: Physical Sciences

"HOTCFGM-1D" denotes a collection of four computer programs, plus the underlying theory, for calculating thermomechanical and inertial effects in axisymmetric cylindrical...

Briefs: Electronics & Computers

Improved electrical connections have been developed for thin-film thermocouples used to measure temperatures on the surfaces of ceramic-matrix composite-material specimens during...

Briefs: Materials

Polyimides have been used widely in fiber-reinforced composite materials for aerospace components and in thin films for packaging of electronic circuitry. Typically, the synthesis of a...

Briefs: Photonics/Optics

A method for making a flow visible in a plane and determining in-plane velocities involves the digitization and digital processing of a sequence of monochrome video images of...

Briefs: Materials

A prototype Stirling-engine regenerator containing a matrix made of carbon-fiber-based composite materials has been developed. The concept underlying this development effort is one of...

Briefs: Materials
Etching Solution for Removal of Silver Plating From Polymers

An etching solution has been developed for use in removal of silver plating from polymer-based (including composite-material) structural components, the surfaces of which are intended to serve as mirrors and waveguide structures. Such structures are often plated with aluminum, copper,...

Briefs: Photonics/Optics

Fiber-optic transceivers (FOTs) that can handle digital signals at any bit rate from 10 to 300 MHz have been developed. These variable-rate FOTs offer considerable advantages over fixed-rate FOTs that...

Briefs: Physical Sciences

An ultrasonic-transducer fixture containing multiple pairs of fixed transducers, plus associated electronic transducer-multiplexing circuitry have been developed to accelerate the acquisition...