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Non-contact measurement of creep res...

Lee, Jonghyun.

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Non-contact measurement of creep resistance of ultra-high-temperature materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Non-contact measurement of creep resistance of ultra-high-temperature materials./
作者:	Lee, Jonghyun.
面頁冊數:	148 p.
附註:	Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1257.
Contained By:	Dissertation Abstracts International68-02B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3254917

Non-contact measurement of creep resistance of ultra-high-temperature materials.
Lee, Jonghyun.

Non-contact measurement of creep resistance of ultra-high-temperature materials. - 148 p.

Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1257.

Thesis (Ph.D.)--University of Massachusetts Amherst, 2007.

Continuing pressures for higher performance and efficiency in energy conversion and propulsion systems are driving ever more demanding needs for new materials which can survive high stresses at the elevated temperatures. In such severe environments, the characterization of creep properties becomes indispensable. Conventional techniques for the measurement of creep are limited to about 1,700°C. A new method which can be applied at temperatures higher than 2,000°C is strongly demanded. This research presents a non-contact method for the measurements of creep resistance of ultra-high-temperature materials. Using the electrostatic levitation (ESL) facility at NASA MSFC, a spherical sample was rotated quickly enough to cause creep deformation due to the centripetal acceleration. The deformation of the sample was captured with a digital camera, and the images were then analyzed to measure creep deformation and to estimate the stress exponent in the constitutive equation of the power-law creep. To compare experimental results, numerical and analytical analyses on creep deformation of a rotating sphere have been conducted. The experimental, numerical, and analytical results showed a good agreement with one another.Subjects--Topical Terms:

783786
Engineering, Mechanical.

Non-contact measurement of creep resistance of ultra-high-temperature materials.
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245 1 0 $a Non-contact measurement of creep resistance of ultra-high-temperature materials.
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502 $a Thesis (Ph.D.)--University of Massachusetts Amherst, 2007.
520 $a Continuing pressures for higher performance and efficiency in energy conversion and propulsion systems are driving ever more demanding needs for new materials which can survive high stresses at the elevated temperatures. In such severe environments, the characterization of creep properties becomes indispensable. Conventional techniques for the measurement of creep are limited to about 1,700°C. A new method which can be applied at temperatures higher than 2,000°C is strongly demanded. This research presents a non-contact method for the measurements of creep resistance of ultra-high-temperature materials. Using the electrostatic levitation (ESL) facility at NASA MSFC, a spherical sample was rotated quickly enough to cause creep deformation due to the centripetal acceleration. The deformation of the sample was captured with a digital camera, and the images were then analyzed to measure creep deformation and to estimate the stress exponent in the constitutive equation of the power-law creep. To compare experimental results, numerical and analytical analyses on creep deformation of a rotating sphere have been conducted. The experimental, numerical, and analytical results showed a good agreement with one another.
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