Dynamic testing, stress corrosion

Clark, W. L. Cowan, R. L. Danko, J. C. Dynamic Straining Stress Corrosion Test for Predicting Boiling Water Reactor Materials Performance... 

During dynamic tests with thermal, load, and shutdown-start-up cycling, the amount and the vapor pressure of the water product varies and formation of liquid water might be involved. In addition, the shutdown-start-up or/and temperature cycling cause thermal and mechanical stresses to the membranes and cell components as well as volume expansions and contractions of the acid in the MEAs. Another important mechanism of the cell degradation involved in these dynamic tests is the corrosion of carbon supports and growth of noble metal catalysts [10]. Some dynamic test results are summarized in Table 22.10. 

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