Creep strain measurement using a potential drop technique

Creep strain measurement using a potential drop technique
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使用电位滴技术测量蠕变应变

DOI:
10.1016/j.ijmecsci.2016.03.015
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发表时间:
2016
影响因子:
7.3
通讯作者:
Corcoran J
Corcoran J
中科院分区:
工程技术1区
文献类型:
--
作者:
Corcoran J

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本文将演示使用电位降传感器来监测应变。特别地,该技术对高温或恶劣环境应用的适用性为监测在蠕变条件下操作的部件中的应变提供了机会。监测电站构件的蠕变损伤是无损评估界长期面临的技术挑战。在文献中,应变率是蠕变损伤进展的一个很好的指标,可用于剩余寿命计算。为了便于使用这种基于应变率的评估方法,已经开发了永久安装的、应变敏感的电位降技术。该技术具有非常简单和强大的硬件,适合在高温或恶劣环境中使用。应变反转被提出并通过实验证明;室温塑性变形实验用于验证,此外,加速蠕变测试证明了在高温(600 °C+)下的操作。良好的协议之间的电位降倒置应变和控制测量。
This paper will demonstrate the use of a potential drop sensor to monitor strain. In particular, the suitability of the technique to high temperature or harsh environment applications presents an opportunity for monitoring strain in components operating under creep conditions. Monitoring creep damage in power station components is a long standing technological challenge to the non-destructive evaluation community. It is well established in the literature that strain rate serves as an excellent indicator of the progress of creep damage and can be used for remnant life calculations. To facilitate the use of such strain rate based evaluation methods, a permanently installed, strain sensitive, potential drop technique has been developed. The technique has very simple and robust hardware lending itself to use at high temperatures or in harsh environments. Strain inversions are presented and demonstrated experimentally; a room temperature, plastic deformation experiment is used for validation and additionally an accelerated creep test demonstrates operation at high temperature (600 °C+). Excellent agreement is shown between potential drop inverted strain and control measurements.
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