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On stress evolution and interaction during electromigration in near bamboo structure lines (1997)

Liu, Yongkun ; Diefendorf, R. J.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 71 (1997), S. 3171-3173

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Electromigration-induced stress in near bamboo structure interconnects has been simulated by the finite element method. The maximum stress at the juncture of polygranular clusters and bamboo segments increases when the stress profile interacts with the line end. The maximum stress at final steady state depends on the relative location of the polygranular cluster in the line under the constant source boundary condition. Under the blocking boundary condition, the steady state stress profile (if it exists) is determined only by current density and total line length and is independent of the microstructure of the line. Finally, the ratio of effective diffusivity of the cluster to that of bamboo segments affects the magnitude of maximum stress at quasi-steady state. © 1997 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.120279

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High-performance carbon fibers (1975)

Diefendorf, R. J. ; Tokarsky, E.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 15 (1975), S. 150-159

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ISSN: 0032-3888

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Graphite has a hexagonal close-packed crystal structure which is strong and stiff in the two directions of the basal plane and, in the third direction - perpendicular to the basal plane - is weak and compliant. High-performance carbon fibers must make use of the strong directions while suffering from the poor properties of the third. This paper describes, from fundamentals, the processes used to produce high-performance carbon fibers. The resulting fiber microstructures and the consequences of these structures on properties are presented.

Additional Material: 20 Ill.