[PDF] Summarizing Report On Stress Corrosion Of Beryllium eBook

Author : Paul D. Miller
Publisher :
Page : 34 pages
File Size : 40,78 MB
Release : 1967
Category : Beryllium
ISBN :

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The report summarizes the corrosion behavior of beryllium. The effects on beryllium of the following environments are considered: moisture, salt solutions, acids, alkalis, gases, organic liquids, molten materials, and solid materials. Stress-corrosion cracking and galvanic effects are also discussed. A final section of the report reviews various types of coatings for protection of beryllium from corrosion by a variety of environments.

Author : K. Koyanagi
Publisher :
Page : 0 pages
File Size : 46,24 MB
Release : 1966
Category :
ISBN :

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Stress corrosion cracking can potentially cause fuel failures at circumferential ridges in the sheath. finite element computer codes elestres and feast are used to calculate two-dimensional, axisymmetric, elastic-plastic sheath stresses at and near the circumferential ridges. the level of stresses is given by the fuel design (such as pellet/sheath diameters, pellet length, pellet density) and by the operating conditions (such as power history). the accuracy, convergence, and cost of the stress calculations, however, are determined by the discretization used in the calculations: the number of nodes in the finite element mesh; the shape of the individual finite elements; the pattern into which the finite elements are arranged; and the size of the calculation-steps into which the power history is subdivided. in this study, we determined the discretization that gives a reasonable compromise of accuracy, convergence, and cost for the stress calculations. the highest accuracy is obtained by using triangular finite elements of aspect ratios close to one, and assembling them into hexagonal patterns. to caputure the stress gradients, five nodes are required across the sheath wall at the ridge, but two nodes are sufficient near the midplane of the pellet. the resulting mesh contains about 200 nodes and about 300 finite elements. calculation-steps of 6 kw/m provide a convergent solution, with a factor of two margin against numerical divergence. with the above arrangement, feast needs about 2.4 seconds on a cdc/cyber 175 computer to calculate sheath stresses per calculation-step. six radial nodes at the ridge would double the computing cost. decreasing the size of the calculation-steps means more calculations are needed to analyze a given power history, giving a linear increase in computing cost.

Author : U.S. Atomic Energy Commission
Publisher :
Page : 12 pages
File Size : 10,40 MB
Release : 1956
Category : Nuclear energy
ISBN :

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""The U.S. Atomic Energy Commission is conducting a large-scale review of its research and development reports to make as much information as possible available through the Civilian Application Program. Report Announcement Bulletin ; Unclassified Reports For Civilian Applications is being published to announce immediately, the release of newly declassified reports. ...All reports announced in the Bulletin are available from: Office of Technical Services, Department of Commerce, Washington 25, D.C., at the price listed with each title."--P.iii.

Author :
Publisher :
Page : 38 pages
File Size : 38,49 MB
Release : 1956
Category : Corrosion and anti-corrosives
ISBN :

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This bibliography contains 111 annotated references to unclassified reports on the corrosion of alloys, commercial alloys, ceramics and plastics. References are included to reports written prior to Dec. 15, 1953. Author, subject, and report number indexes are provided.