The deterministic and non-deterministic models for the predictions of crack growth rates of type 304 stainless steel. Ph.D. Thesis
Intergranular stress corrosion cracking (IGSCC) of recirculation piping in boiling water reactors (BWR) has been a major operating problem in the world. The cracking usually occurs in the heat affected zone adjacent to the weld in type 304 stainless steel (304SS). The concern with this is that is not only occurs on small pipes, but also on larger diameter pipes. This concern is growing because of the difficulty of repairing or replacing larger diameter pipes in the field. Therefore, the development of life prediction methods is a pressing issue. There are two approaches for making predictions. One is based on the theoretical models (deterministic model); the other is based on experimental data (non-deterministic model). In this work, both approaches will be discussed in detail. In the deterministic approach, the authors develop an electrochemical model that couples the internal and external environments of the crack. The non-deterministic approach uses a new technique: Artificial Neural Network, which does not pre-suppose any model or assumption, but learns from data.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States). Davey Lab.
- OSTI ID:
- 264011
- Report Number(s):
- N--96-23592; NIPS--96-08279
- Country of Publication:
- United States
- Language:
- English
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