Mechanical Characteristics of Electrolytes assessed with Resonant Ultrasound Spectroscopy
Mechanical Characteristics of Electrolytes assessed with Resonant Ultrasound Spectroscopy
复制标题
用共振超声光谱评估电解质的机械特性
DOI：
10.1002/fuce.201200161
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
and Jurgen Malzbender
中科院分区：
文献类型：
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作者：
Wakako Araki;Hidenori Azuma;Takahiro Yota;Yoshio Arai;and Jurgen Malzbender
弹性性能和残余应力是陶瓷构件可靠性评估的关键。阳极支撑SOFC的薄电解质层处于高压缩残余应力状态下。在本研究中，该层的弹性性能以及在阳极支撑的平面SOFC电池中引起的残余应力分布通过使用共振超声光谱（罗斯）检查。有限元模拟模态分析表明，罗斯有很大的潜力，以确定这些机械特性。杨氏模量可以从分层样品的固有频率确定，而残余应力可以使用带有半孔的样品确定。泊松比的估计是可能的。在实验中，使用本罗斯系统成功地识别了各种单独的共振振荡。因此，通过对比实验结果和模拟，弹性性能以及残余应力得到。虽然所提出的方法在实验上仍然具有挑战性，但它可以发展成为同时确定薄层系统的残余应力和弹性常数的强大工具。
Elastic properties and residual stresses are critical for the assessment of the reliability of ceramics components. The thin electrolyte layer of anode supported SOFCs is under a state of high compressive residual stress. In the present study, the elastic properties of this layer as well as the residual stress distribution induced in the anode‐supported planar SOFC cell were examined by using the resonant ultrasound spectroscopy (RUS). A modal analysis by finite element simulation demonstrated that the RUS has a great potential to determine these mechanical characteristics. The Young's modulus can be determined from the natural frequencies of the layered sample whilst the residual stress can be determined using the sample with a semi‐hole. Estimates of the Poisson's ratio are possible. In the experiment, various individual resonant oscillations were successfully identified using the present RUS system. Hence, by comparison of experimental results and simulations, the elastic properties as well as the residual stress were obtained. Although the proposed method is still experimentally challenging, it could be developed to become a powerful tool to simultaneously determine residual stresses and elastic constants of thin‐layered systems.