Effects of hydrogen peroxide on intergranular stress corrosion cracking ofstainless steel in high temperature water, (II) Optimization of crack propagation rate measurement system
S. Uchida et al., Effects of hydrogen peroxide on intergranular stress corrosion cracking ofstainless steel in high temperature water, (II) Optimization of crack propagation rate measurement system, J NUC SCI T, 37(3), 2000, pp. 257-266
In order to determine a crack propagation rate of less than 10(-8) mm/s in
a 24-hour integrated measurement, major parameters of a coupled system of a
constant tension specimen and crack depth measurement, based on potential
drop method, have been optimized. Influences of sensor geometry, location f
or detecting potential drop and data processing of the ratio of signal to n
oise (S/N) were optimized by applying Taguchi's Method. Then a suitable sen
sor geometry and data processing method were proposed to get a robust measu
rement system with higher sensitivity and lower susceptibility for geometri
cal and procedural fluctuations.
By applying the optimal crack propagation rate measurement system, it was c
onfirmed that a crack propagation rate of 1x10(-8) mm/s can be measured und
er a low concentration condition of hydrogen peroxide with less than a 20%
error by a 24-hour integrated measurement.