Complete relaxation of residual stresses during reduction of solid oxide fuel cells

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Abstract

To asses the reliability of solid oxide fuel cell (SOFC) stacks during operation, the stress field in the stack must be known. During operation the stress field will depend on time as creep processes relax stresses. This work reports further details on a newly discovered creep phenomenon, accelerated creep, taking place during the reduction of the anode. This relaxes stresses at a much higher rate (~×104) than creep during operation. The phenomenon has previously been studied by simultaneous loading and reduction. With the recorded high creep rates, the stresses at the time of reduction should reduce significantly over minutes. In this work the stresses are measured in-situ before and after the reduction by use of XRD. The phenomenon of accelerated creep has to be considered both in the production of stacks and in the analysis of the stress field in a stack based on anode supported SOFCs.
Original languageEnglish
Title of host publicationProceedings of EFC2015
EditorsViviana Cigolotti, Chiara Barchiesi, Michela Chianella
Number of pages2
PublisherENEA
Publication date2015
Article numberEFC15151
ISBN (Electronic)978-88-8286-324-1
Publication statusPublished - 2015
EventEuropean Fuel Cell Technology & Applications Conference 2015 - Naples, Italy
Duration: 16 Dec 201518 Dec 2015

Conference

ConferenceEuropean Fuel Cell Technology & Applications Conference 2015
CountryItaly
CityNaples
Period16/12/201518/12/2015

Cite this

Frandsen, H. L., Chatzichristodoulou, C., & Hendriksen, P. V. (2015). Complete relaxation of residual stresses during reduction of solid oxide fuel cells. In V. Cigolotti, C. Barchiesi, & M. Chianella (Eds.), Proceedings of EFC2015 [EFC15151] ENEA.