Keyword: Fatigue

Briefs: Test & Measurement
The device uses load frames to test bonded structures in aerospace, automotive, defense, and energy storage applications.
Briefs: Aerospace
This lightweight material brings strength and durability to complex shapes.
Briefs: Mechanical & Fluid Systems

In order to qualify miniature springs, manufacturers of these systems rely on commercially available testers that are designed for large-scale springs (>0.5" diameter). Commercially available spring...

Briefs: Motion Control

In discussing fatigue life, it is important to distinguish between disc springs and conical spring washers, as they differ by design and intended usage. Conical spring washers are...

Briefs: Test & Measurement

NASA's Langley Research Center has developed a method that introduces solids and particulates — specifically aerogels — into composites or...

Application Briefs: Test & Measurement

Materials testing and characterization is often a lengthy process. It can take more than a year and billions of testing cycles for a manufacturer to characterize the properties of a new...

Briefs: Sensors/Data Acquisition

A blue-light imaging method was developed that can be used to obtain visual data from large test fires where high temperatures could disable or destroy conventional electrical and mechanical sensors. The...

Briefs: Materials
Simulation Technique Models Material-Aging Process

The nation's aging infrastructure requires massive investment. Imagine if engineers could build structures with materials that do not degrade over time. A simulation technique was developed that could help engineers do just that.

Briefs: Test & Measurement

Wind turbine designers are working to provide blade designs that allow a turbine connected to the blades or rotor to effectively convert wind into electricity. The blades must also be...

Briefs: Sensors/Data Acquisition

NASA's Langley Research Center has developed a novel polymer material that can be utilized as a real-time structural health monitoring sensor. The material is...

Briefs: Manufacturing & Prototyping

Carbon fiber (CF) and carbon fiber composites have gained widespread use in recent years due to their unique combination of high strength and...

Briefs: Sensors/Data Acquisition

NASA's Langley Research Center has developed a Floating Ultrasonic System for improved nondestructive testing. Most ultrasonic scanners require an...

Briefs: Materials

NASA’s Langley Research Center has developed a novel shape memory polymer (SMP) made from composite materials for use in morphing structures. In response to an external stimulus such...

Briefs: Materials
Enhanced Composite Damping Through Engineered Interfaces

Material damping is important in the design of structures as it limits vibration amplitudes, increases fatigue life, and affects impact resistance. This is particularly true for composite materials, which are currently used extensively in applications that experience frequent dynamic...

Articles: Photonics/Optics

Virtually every type of public infrastructure — including bridges, pipelines, tunnels, foundations, roadways, dams, etc. — is subject to factors that can degrade it or lead to...

Briefs: Medical
Bayesian Sleep Fusion

To ensure mission success, astronauts must maintain a high level of performance, even when work-rest schedules result in chronic sleep restriction and circadian misalignment, both of which can contribute to fatigue and performance deficits unless effective countermeasures are used. The overarching goal of this project is to...

Application Briefs: Motion Control

Instron (Norwood, MA) manufactures materials testing equipment and accessories that are used to test samples ranging from components for jet engines to medical syringes. The...

Briefs: Materials
Compliant Electrode and Composite Materials for Piezoelectric Wind and Mechanical Energy Conversion

Thin film, piezoelectric materials generate a small voltage whenever they are deformed, suggesting that they are suitable for tapping energy from freely available resources, such as the wind. Yet their low-energy production levels and lack of...

Briefs: Robotics, Automation & Control
Rapid Quench Furnace for Processing Powder in an Inert Environment

Ongoing work in the development and characterization of sensory materials requires the development of shape memory alloy (SMA) powder or particles. These are embedded in structural material so that the progression of localized damage that occurs during fatigue crack growth will...

Briefs: Mechanical & Fluid Systems
Improved Attachment Design for Ceramic Turbine Blades Via Hybrid Concepts

This innovation is a hybrid metal-ceramic matrix composite (CMC) turbine blade in which a SiC/SiC CMC airfoil section is bonded to a single-crystal superalloy root section in order to mitigate risks associated with an all-CMC blade inserted in a superalloy disk. This will...

Articles: Manufacturing & Prototyping

The technologies NASA develops don’t just blast off into space. They also improve our lives here on Earth. Life-saving search-and-rescue tools, implantable medical devices, advances in commercial aircraft...

Briefs: Software
Half-Cycle Crack Growth

Half-Cycle Crack Growth software offers a reliable method for calculating theoretical fatigue crack growths that could lead to catastrophic structural component failures. The program builds upon and integrates Armstrong’s proven half-cycle and closed-form aging theories, and considers every half-cycle of loading spectra...

Briefs: Electronics & Computers

The Highly Accelerated Life Testing (HALT) process subjects test articles to accelerated combined environments of thermal, dynamic, voltage, and current to find...

Briefs: Test & Measurement

The criterion for structural failure must be based on failure modes of the component being designed. If the component is to withstand millions of cycles of load application,...

Briefs: Materials
Mechanistic-Based Multiaxial- Stochastic-Strength Model for Transversely- Isotropic Brittle Materials

A methodology has been developed and the software written to predict the probability of failure of transversely isotropic (a type of anisotropy) materials under generalized thermomechanical loading. This methodology is mechanistic in that it is...

Briefs: Manufacturing & Prototyping
Improving Friction Stir Welds Using Laser Peening

Friction stir welding (FSW) has emerged as a promising solid-state process with encouraging results, particularly when used on high-strength aerospace aluminum alloys that are generally difficult to weld. Laser peening has been applied to the mechanical and fatigue properties of welded joints....

Application Briefs: Aerospace

Aurora Flight Sciences delivered a completed Space Suit Simulator (S3) to NASA following the successful completion of a Phase II Small Business Innovation Research (SBIR) effort.

Briefs: Physical Sciences
Reliability of CCGA 1152 and CCGA 1272 Interconnect Packages for Extreme Thermal Environments

Ceramic column grid array (CCGA) packages have been increasing in use based on their advantages of high interconnect density, very good thermal and electrical performance, and compatibility with standard surface-mount packaging assembly processes. CCGA...

Briefs: Software
Probabilistic Fatigue Damage Program (FATIG)

FATIG computes fatigue damage/ fatigue life using the stress rms (root mean square) value, the total number of cycles, and S–N curve parameters. The damage is computed by the following methods: (a) traditional method using Miner’s rule with stress cycles determined from a Rayleigh distribution up...

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