摘要
应用Hopkinson压杆装置,研究了阳极支撑固体氧化物燃料电池片（SOFC）半电池NiO–YSZ/YSZ的冲击力学性能,得到了半电池薄片在不同应变率下的应力–应变曲线,分析了半电池中的应力波传播特性及其应变率效应。结果表明：半电池薄片在冲击载荷下,弹性变形范围很小,塑性屈服极限强度较小,且对应的应变值也较小。在半电池样品的极限强度范围内,随着应变的增大,半电池样品薄片的动态应力–应变曲线的切线模量减小,属于递减硬化材料;半电池中的应力波传播速率减小。随着应变率的增加,半电池薄片的极限强度增大,应变率效应明显。另外,随着波阻抗比的增大,半电池薄片中应力–应变＂均匀化＂分布的透射–反射次数随之减小。
The impact mechanical performance, deformation, stress wave propagation characteristics, and dynamic stress-strain response of anode-supported planar solid oxide fuel cell were investigated in the Hopkinson bar device. The results show that all the half-cell samples exhibit small elastic and plastic deformation regimes and a small yield strength, indicating that they are brittle-like materials. The tangential modulus estimated from the dynamic stress-strain curves decreases with the increment of strain, demonstrating that the half-cell samples behave like the reduced hardening materials. All the mechanical performances are related to the strain rate. A high strain rate leads to a high wave impedance ratio. A small number of transmission-reflection is need to achieve the homogenization for the stress-strain distribution.
作者
李善恩
徐挺
缪馥星
官万兵
LI Shanen;XU Ting;MIA O Fuxing;G UAN Wanb ing(Key Laboratory of Impact and Safety Engineering,Ministry of Education of China,Ningbo University,Ningbo 315211,Zhejiang,China;Ningbo Institute of Industrial Technology,Chinese Academy of Sciences,Ningbo 315201,Zhejiang,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2018年第6期861-866,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(11572161,51502316)
机械结构强度与振动国家重点实验室(SV2016–KF–17)
浙江省“近海结构冲击安全防护与健康监测”重点科技创新团队(2013TD21)
