Development of a Mechanistic-BasedHealing Model for Self-Healing Glass Seals

13th Annual SECA Workshop

Others  :  http://www.netl.doe.gov/publications/proceedings/12/seca/pdf/poster/Zbib.pdf
PID  :  48969

来源: CEUR

【 摘 要 】

The usage of self-healing glass as hermetic seals is a recent advancement in sealing technology development for the planar solid oxide fuel cells (SOFCs). Because of its capability of restoring the mechanical properties at elevated temperatures, the self-healing glass seal is expected to provide high reliability in maintaining the long-term structural integrity and functionality of SOFCs. In order to accommodate the design and to evaluate the effectiveness of such engineering seals under various thermo-mechanical operating conditions, a mechanistic-based, two-stage computational model was developed to accurately capture and predict the stress and temperature-dependent crack- healing behavior of the self-healing glass materials. The model was first calibrated by experimental measurements combined with the kinetic Monte Carlo (kMC) simulation results and then implemented into finite element (FE) analysis. The effects of various factors, i.e. stress, temperature, crack morphology, on the healing behavior of the glass were investigated and discussed.