Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Success in Development of High Temperature, High Speed Metal Fatigue Test Device with 1000°C Heat Resistance

21.09.2011
An Important Contribution to Securing the Safety of Jet Engines and Gas Turbines for Power Generation

A research group led by Dr. Yoshiyuki Furuya, a Senior Researcher of the Materials Reliability Unit, National Institute for Materials Science, succeeded in the development of a high temperature ultrasonic fatigue test technology which is capable of evaluating the metal fatigue properties for critical components under high temperature, high frequency vibration environments which closely resemble the interior of jet engines and gas turbines.

A research group led by Dr. Yoshiyuki Furuya, a Senior Researcher of the Materials Reliability Unit (Unit Director: Kazuhiro Kimura), National Institute for Materials Science (President: Sukekatsu Ushioda), succeeded in the development of a high temperature ultrasonic fatigue test technology which is capable of evaluating the metal fatigue properties for critical components under high temperature, high frequency vibration environments which closely resemble the interior of jet engines and gas turbines.

Turbine blades in jet engines and gas turbines are subject to resonance, which causes high speed vibration a frequency of several 1000Hz. In fatigue due to this vibration, the number of cycles exceeds 1 gigacycles (109, or 1 billion cycles). However, conventional fatigue tests are performed at a low frequency on the order of 10Hz (10 cycles per second, or 109 cycles in 3 years), and therefore require an extended test period. For this reason, evaluations of the fatigue properties of materials had been limited to around 107 cycles, which can be achieved in approximately 1 week.

In contrast, in this research, the NIMS Group conceived application of ultrasonic fatigue test technology, which is capable of realizing fatigue testing at a high frequency of 20,000Hz (20,000 cycles/second, achieving 109 cycles in 1 day) using ultrasonic vibration. Using this technology, the fatigue properties of materials can be evaluated rapidly up to the gigacycle region.

Because ultrasonic fatigue testing is a special test method using the phenomenon of resonance, the number of factors influenced by temperature is extremely large, and it was difficult to designate and make a device follow all these factors. To solve this problem, the NIMS group carried out a detailed analysis of the factors which are influenced by temperature, reviewed the control method, and added/improved part design and sensors. The team also discovered factors which had been overlooked in conventional research by a process which enhanced the completeness of the device while conducting trial-and-error experiments, and succeeded in correcting those problems. As a result, it was possible to develop a completely new device incorporating a large number of special improvements, based on a commercial testing device. The developed device can realize high accuracy ultrasonic fatigue tests at a high temperature of 1000°C, and thus is capable of performing fatigue testing under environments similar to the service environments of jet engines and gas turbines, which are exposed to high frequency vibration at high temperature.

In demonstration tests, the results of fatigue tests performed with the device developed in this research were in good agreement with the comparison data (fatigue test results accumulated over a long period of several decades), showing the high reliability of the test results with the developed device. The development of a high temperature ultrasonic fatigue test device enabling testing up to 1000°C and confirmation of the reliability of the test results will contribute to improved reliability in jet engines and gas turbines, and is also expected to accelerate research and development of materials for use in high strength turbine blades.

The results of this research were presented on July 18 at the M&M 2011 Materials and Mechanics Conference of the Japan Society of Mechanical Engineers.

Mikiko Tanifuji | Research asia research news
Further information:
http://www.nims.go.jp/eng/index.html
http://www.researchsea.com

More articles from Materials Sciences:

nachricht Nagoya physicists resolve long-standing mystery of structure-less transition
21.08.2017 | Nagoya University

nachricht Scientists from the MSU studied new liquid-crystalline photochrom
21.08.2017 | Lomonosov Moscow State University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

Nagoya physicists resolve long-standing mystery of structure-less transition

21.08.2017 | Materials Sciences

Chronic stress induces fatal organ dysfunctions via a new neural circuit

21.08.2017 | Health and Medicine

Scientists from the MSU studied new liquid-crystalline photochrom

21.08.2017 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>