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 Manchester scientists tie the tightest knot ever achieved
13.01.2017 | University of Manchester

nachricht CWRU directly measures how perovskite solar films efficiently convert light to power
12.01.2017 | Case Western Reserve 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: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

Im Focus: Newly proposed reference datasets improve weather satellite data quality

UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration

"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...

Im Focus: Repairing defects in fiber-reinforced plastics more efficiently

Fiber-reinforced plastics (FRP) are frequently used in the aeronautic and automobile industry. However, the repair of workpieces made of these composite materials is often less profitable than exchanging the part. In order to increase the lifetime of FRP parts and to make them more eco-efficient, the Laser Zentrum Hannover e.V. (LZH) and the Apodius GmbH want to combine a new measuring device for fiber layer orientation with an innovative laser-based repair process.

Defects in FRP pieces may be production or operation-related. Whether or not repair is cost-effective depends on the geometry of the defective area, the tools...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Multiregional brain on a chip

16.01.2017 | Power and Electrical Engineering

New technology enables 5-D imaging in live animals, humans

16.01.2017 | Information Technology

Researchers develop environmentally friendly soy air filter

16.01.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>