Development of an expert system for fractography of environmentally assisted cracking
- Kyoto Univ. (Japan). Dept. of Mechanical Engineering
- Nippon Steel Corp., Kawasaki (Japan). Advanced Technology Research Lab.
An expert system that diagnoses the causes of failure of environmentally assisted cracking (EAC) based upon fractography has been developed. The system uses the OPS83 programming language, expressing rules in the manner of production rules, and is composed of three independent subsystems, which respectively deal with EACs of high-strength or high-tensile-strength steel, aluminum alloy, and stainless steel in dry and humidified air, water, and aqueous solutions containing Cl, Br, or I ions. The concerned EAC issues cover stress corrosion cracking (SCC), hydrogen embrittlement, cyclic SCC, dynamic SCC, and corrosion fatigue as well as fatigue and overload fracture. The knowledge base covers the rules relating to not only environments, materials, and loading conditions, but also macroscopic and microscopic fracture surface morphology. In order to deal with vague expressions of fracture surface morphology, fuzzy set theory is used in the system, and the description of rules about vague fracture surface appearance is thereby possible. Applying the developed expert system to case histories, accurate diagnoses were made. The authors discuss the related diagnosis results and usefulness of the developed system.
- OSTI ID:
- 624369
- Report Number(s):
- CONF-9511180-; TRN: IM9820%%339
- Resource Relation:
- Conference: 5. international symposium on computerization and networking of materials property data, Tsukuba (Japan), 6-8 Nov 1995; Other Information: PBD: 1997; Related Information: Is Part Of Computerization and networking of materials databases: Fifth volume; Nishijima, Satoshi [ed.] [National Research Inst. for Metals, Tsukuba (Japan). Center for Advanced Physical Fields]; Iwata, Shuichi [ed.] [Univ. of Tokyo (Japan). Center for Engineering]; PB: 266 p.; ASTM special technical publication, 1311
- Country of Publication:
- United States
- Language:
- English
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