NUREG/CR.


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Elastic-Plastic Fracture


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Chemistry and Physics of Fracture


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For many years it has been recognized that engineering materials that are-tough and ductile can be rendered susceptible to premature fracture through their reaction with the environment. Over 100 years ago, Reynolds associated hydrogen with detrimental effects on the ductility of iron. The "season cracking" of brass has been a known problem for dec ades, but the mechanisms for this stress-corrosion process are only today being elucidated. In more recent times, the mechanical properties of most engineering materials have been shown to be adversely affected by hydrogen embrittlement or stress-corrosion cracking. Early studies of environmental effects on crack growth attempted to identify a unified theory to explain the crack growth behavior of groups of materials in a variety of environments. It is currently understood that there are numerous stress-corrosion processes some of which may be common to several materials, but that the crack growth behavior of a given material is dependent on microstructure, microchemistry, mechanics, surface chemistry, and solution chemistry. Although the mechanism by which various chemical species in the environment may cause cracks to propagate in some materials but not in others is very complex, the net result of all environmentally induced fracture is the reduction in the force and energy associated with the tensile or shear separation of atoms at the crack tip.




Application of Fracture Mechanics to Materials and Structures


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An International Conference on the Application of Fracture Mechanics to Ma terials and Structures was held at the Hotel Kolpinghaus in Freiburg, West Ger many, June 20-24, 1983. It was attended by more than 250 participants from different countries which include Austria, Canada, Czechoslovakia, Democratic Republic of Germany, Denmark, Federal Republic of Germany, Finland, France, Greece, Hungary, Israel, Italy, Japan, Netherlands, Norway, People's Republic of China, Portugal, Sweden, Switzerland, United Kingdom, United States of America, USSR and Yugoslavia. Conference Co-Chairmen were Professor G. C. Sih, Lehigh University, Bethle hem, Pennsylvania, U. S. A. , Dr. E. Sommer, Fraunhofer-Institut fur Werkstoff mechanik, Freiburg, FRG and Professor W. Dahl, Rheinisch-Westfalische Technische Hochschule, Aachen, FRG. Dr. Wenrich, as the representative of the Land Baden-WUrttemberg, delivered the opening address with the remarks that International Conferences can serve the means to further enhance the technology development of a country. He empha sized that the Federal Republic of Germany is presently in need of strengthening the engineering manpower in order to keep her in a competitive position. The Conference was officially cast off with the leading plenary lectures that under lined the theme of the technical lectures for the first day. This pattern was observed for the five-day meeting. The interplay between material and design re quirements was the theme and emphasized in many of the technical presentations that amounted to approximately ninety (90) papers.







Fracture Mechanics


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Advances in Fracture Research


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Advances in Fracture Research, Volume 6, documents the proceedings of the 5th International Conference on Fracture (ICF5) held in Cannes, France, 29 March-3 April 1981. The conference was attended by 670 participants from 26 countries. The program consisted of plenary sessions with invited speakers, technical sessions with contributed papers, a poster session, and two round table discussions. This volume contains 14 papers that deal with topics such as advancements in fracture mechanics; the application of fracture mechanics in three areas: damage tolerance requirements for aircraft structures, toughness requirements for bridges and heat up and cool down schedule, and evaluation of in service NDE indications for nuclear pressure vessels; and the analysis of crack-tip stress and strain fields for stationary and growing cracks in inelastic solids under monotonic loading. Also included are papers on the impact of environment on fracture; the problem of fracture of large concrete structures; and microcracking in hydrogenated austenitic steels.