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Briefs
Physical Sciences

Fatigue Crack Detection Via Load-Differential Guided Wave Methods

Guided waves (e.g., Lamb waves) have been considered for many structural health monitoring (SHM) applications because of their ability to travel long distances and maintain...

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Briefs
Materials

Size Scale and Defect Engineered Nanostructures for Optimal Strength and Toughness

Realistic combinations of ceramics and/or semiconductors have been developed that simultaneously achieve high hardness (>40 GPa) and toughness (>400 MPa*m1/2). To achieve this goal, there were three primary objectives: (1) the development of physically...

Application Briefs
Defense

Fluorosilicones

A broad operating temperature range, fuel resistance and long-term reliability are some of the unique properties of fluorosilicones that make them useful in aerospace applications. To demonstrate their effectiveness, NuSil...

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Articles
Aerospace

Using Fiber Metal Abradable Seals in Aerospace Turbine Applications

Limiting leakage in aerospace turbo-machinery has been a focus of engineers ever since the advent of the turbine. An increasing number of companies are finding that fiber...

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Application Briefs
RF & Microwave Electronics

Impact of Materials on Microwave Cable Performance

The environments in which microwave cable assemblies are being used today are becoming more challenging with exposure to such conditions as extreme temperatures, chemicals, abrasion, and...

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Briefs
Electronics & Computers

MEMS Resettable Circuit Breaker and Switch for DC-DC Voltage Converters

Resettable circuit breaker cantilevers use silicon dioxide (SiO2) for temper ature compensation. The compressive stress in the SiO2 causes the...

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Briefs
Electronics & Computers

Differential Amplifier Circuits Based on Carbon Nanotube Field Effect Transistors (CNTFETs)

Since their discovery, carbon nanotubes (CNTs) have been extensively studied for their great potential in a variety of applications. Several desirable properties that CNTs possess include a high thermal conductivity, high electrical mobility, high...

Briefs
Mechanical & Fluid Systems

Membrane Pump for Synthetic Muscle Actuation

A synthetic muscle has been developed that uses inflatable balloons to produce a tensile force from a positive pressurization. Mechanical supply and ducting is used to provide the required pressurization. However, the mechanical supply and ducting that is currently used is limited in several respects....

Briefs
Materials

Mechanical Response of an Al-PTFE Composite to Uniaxial Compression Over a Range of Strain Rates and Temperatures

Reactive materials can be loosely categorized as composites of inert solid materials which, when subjected to a violent...

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Briefs
Sensors/Data Acquisition

Cracking of Aluminum Panels Repaired With Composite Patches

An experimental study of the mechanical behavior of cracked aluminum specimens repaired with composite-material patches has yielded findings that may eventually contribute to the...

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Briefs
Materials

Testing Silver-Coated Nylon Fibers as Electrical Conductors

Tests have been performed in an effort to gain understanding of electrical and mechanical properties of silver-coated nylon fibers subjected to stresses and strains and exposed to...

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Briefs
Mechanical & Fluid Systems

Biaxial and Shear Testing Apparatus With Force Controls

An apparatus for in-plane biaxial tension/compression and in-plane shear testing of fabrics, other flexible sheet materials, or relatively rigid thin plate materials has been invented....

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Briefs
Medical

Scientists Create Optically Equivalent Synthetic Human Tissue

Lasers are an integral part of the modern battlefield, used for applications as diverse as point-to-point communications and ballistic missile defense. Their widespread use...

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Briefs
Materials

Ceramic Matrix Composites Research

AFRL scientists characterized and evaluated the high-temperature mechanical behavior of fiber-reinforced ceramic matrix composite (CMC) materials used in aerospace structural applications. Researchers...

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