Numerical study on thermal stresses of a planar solid oxide fuel cell

2014 ◽  
Vol 77 ◽  
pp. 1-10 ◽  
Author(s):  
Pengfei Fan ◽  
Guojun Li ◽  
Yikai Zeng ◽  
Xiongwen Zhang
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Thermal Stresses ◽  
Numerical Study ◽  
Solid Oxide ◽  
Oxide Fuel

Numerical Study of Thermal Stresses in a Planar Solid Oxide Fuel Cell Stack

2017 ◽  
Author(s):  
Cun Wang ◽  
Tao Zhang ◽  
Cheng Zhao ◽  
Jian Pu
Keyword(s):  
Thermal Stress ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Thermal Stresses ◽  
Coefficient Of Thermal Expansion ◽  
Numerical Study ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Compressive Loads ◽  
Cte Mismatch

A three dimensional numerical model of a practical planar solid oxide fuel cell (SOFC) stack based on the finite element method is constructed to analyze the thermal stress generated at different uniform temperatures. Effects of cell positions, different compressive loads, and coefficient of thermal expansion (CTE) mismatch of different SOFC components on the thermal stress distribution are investigated in this work. Numerical results indicate that the maximum thermal stress appears at the corner of the interface between ceramic sealants and cells. Meanwhile the maximum thermal stress at high temperature is significantly larger than that at room temperature (RT) and presents linear growth with the increase of operating temperature. Since the SOFC stack is under the combined action of mechanical and thermal loads, the distribution of thermal stress in the components such as interconnects and ceramic sealants are greatly controlled by the CTE mismatch and scarcely influenced by the compressive loads.

scholarly journals A Numerical Investigation of the Thermal Stresses of a Planar Solid Oxide Fuel Cell

Materials ◽  
2016 ◽  
Vol 9 (10) ◽  
pp. 814 ◽  
Author(s):  
Paulina Pianko-Oprych ◽  
Tomasz Zinko ◽  
Zdzisław Jaworski
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Numerical Investigation ◽  
Thermal Stresses ◽  
Solid Oxide ◽  
Oxide Fuel

Effect of Temperature Fluctuation on Creep and Failure Probability for Planar Solid Oxide Fuel Cell

2015 ◽  
Vol 12 (5) ◽  
Author(s):  
Wenchun Jiang ◽  
Yun Luo ◽  
Weiya Zhang ◽  
Wanchuck Woo ◽  
S. T. Tu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Creep Strain ◽  
Failure Probability ◽  
Temperature Fluctuation ◽  
Thermal Stresses ◽  
Solid Oxide ◽  
Effect Of Temperature ◽  
Oxide Fuel ◽  
Creep Failure

The creep and failure probability of a planar solid oxide fuel cell (SOFC) through a duty cycle is calculated by finite element method (FEM) and Weibull method, respectively. Two sealing methods, namely, rigid seal and bonded compliant seal (BCS), are compared. For the rigid seal, failure is predicted in the glass ceramic because of a failure probability of 1 and maximum creep strain. For the BCS design, the foil can absorb part of thermal stresses in the cell by its own elastoplastic deformation, which considerably decreases failure probability and creep strain in the SOFC. The creep strength of BCS method is achieved by sealing foil with excellent creep properties. Temperature fluctuation during the operating stage leads to the increase in thermal stress and failure probability. In particular, temperature change from low-power to high-power state results in a considerable increase in the creep strain, leading to creep failure for the rigid seal. A failure probability of 1 is generated during start-up and shut-down stages. Therefore, temperature fluctuation should be controlled to ensure structural integrity, and lowering the operating temperature can decrease failure probability and creep failure.

Solid oxide fuel cell numerical study: modified MOLB-type and simple planar geometries with internal reforming

2015 ◽  
Vol 159 ◽  
pp. 149-157 ◽  
Author(s):  
J.J. Ramírez-Minguela ◽  
J.L. Rodríguez-Muñoz ◽  
V. Pérez-García ◽  
J.M. Mendoza-Miranda ◽  
V.D. Muñoz-Carpio ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Numerical Study ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Internal Reforming ◽  
Planar Geometries

Life Prediction of a Solid Oxide Fuel Cell Under Thermal Cycling Conditions

2009 ◽  
Author(s):  
Lin Liu ◽  
Gap-Yong Kim ◽  
Abhijit Chandra
Keyword(s):  
Fuel Cell ◽  
Thermal Cycling ◽  
Solid Oxide Fuel Cell ◽  
Life Prediction ◽  
Thermal Stresses ◽  
Crack Nucleation ◽  
Free Edge ◽  
Solid Oxide ◽  
Shear Stresses ◽  
Oxide Fuel

Typical operating temperature of a solid oxide fuel cell (SOFC) is above 600°C, which leads to severe thermal stresses caused by the difference in coefficients of thermal expansion (CTE) during thermal cycling. Interfacial and peeling stresses are two types of thermal stress that cause the mechanical failure of the SOFC. The paper develops a mathematical model to estimate thermal stresses in a typical electrolyte-supported SOFC (NiO/8YSZ-YSZ-LSM). The proposed model is then utilized to obtain analytical expressions for interfacial and peeling stresses. This model provides insight into the distribution of interfacial and peeling stresses of SOFCs and the cause of catastrophic failure. A model for crack nucleation in multi-layered structures under thermal cycling is generalized and utilized in this study for the life prediction. It is found that the peeling and interfacial shear stresses are more concentrated near free edge areas. The relevant damage evolution rate accelerates as the crack propagates. The work also provides a foundation for future SOFC reliability and life prediction research.

scholarly journals Solid oxide fuel cell interconnect design optimization considering the thermal stresses

2016 ◽  
Vol 61 (17) ◽  
pp. 1333-1344 ◽  
Author(s):  
Min Xu ◽  
Tingshuai Li ◽  
Ming Yang ◽  
Martin Andersson
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Design Optimization ◽  
Thermal Stresses ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Interconnect Design

Modeling of an anode supported solid oxide fuel cell focusing on thermal stresses

2016 ◽  
Vol 41 (33) ◽  
pp. 14927-14940 ◽  
Author(s):  
Min Xu ◽  
Ting Shuai Li ◽  
Ming Yang ◽  
Martin Andersson ◽  
Ida Fransson ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Thermal Stresses ◽  
Solid Oxide ◽  
Oxide Fuel
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