Fractal character of fracture surfaces and boundary values of toughness in a simple ceramic-ceramic system

1995 ◽  
Vol 197 (1) ◽  
pp. 109-112 ◽  
Author(s):  
Giuseppe Pezzotti ◽  
Mototsugu Sakai ◽  
Yasunori Okamoto ◽  
Toshihiko Nishida
Keyword(s):  
Boundary Values ◽  
Ceramic System ◽  
Fracture Surfaces ◽  
Fractal Character ◽  
Character Of Fracture

On the interpretation of the fractal character of fracture surfaces

1990 ◽  
Vol 38 (2) ◽  
pp. 143-159 ◽  
Author(s):  
R.H. Dauskardt ◽  
F. Haubensak ◽  
R.O. Ritchie
Keyword(s):  
Fracture Surfaces ◽  
Fractal Character ◽  
Character Of Fracture

Fractal character of fracture surfaces of metals

Nature ◽  
1984 ◽  
Vol 308 (5961) ◽  
pp. 721-722 ◽  
Author(s):  
Benoit B. Mandelbrot ◽  
Dann. E. Passoja ◽  
Alvin J. Paullay
Keyword(s):  
Fracture Surfaces ◽  
Fractal Character ◽  
Character Of Fracture

Hyperbolic distributions and fractal character of fracture surfaces

1992 ◽  
Vol 46 (6) ◽  
pp. 3523-3526 ◽  
Author(s):  
Peter McAnulty ◽  
L. V. Meisel ◽  
P. J. Cote
Keyword(s):  
Fracture Surfaces ◽  
Fractal Character ◽  
Character Of Fracture

New Dimensions in Freeze-Etching

1969 ◽  
Vol 27 ◽  
pp. 202-203 ◽  
Author(s):  
Russell L. Steere ◽  
Michael Moseley
Keyword(s):  
Fracture Surfaces ◽  
Aluminum Specimen ◽  
Specimen Holder ◽  
Freeze Etching ◽  
The Right

A redesigned specimen holder and cap have made possible the freeze-etching of both fracture surfaces of a frozen fractured specimen. In principal, the procedure involves freezing a specimen between two specimen holders (as shown in A, Fig. 1, and the left side of Fig. 2). The aluminum specimen holders and brass cap are constructed so that the upper specimen holder can be forced loose, turned over, and pressed down firmly against the specimen stage to a position represented by B, Fig. 1, and the right side of Fig. 2.

Locating Al in the DABCO catalyst before and after Al extraction

1990 ◽  
Vol 48 (4) ◽  
pp. 265-267
Author(s):  
Kathleen B. Reuter
Keyword(s):  
Active Site ◽  
Inverse Relationship ◽  
Transverse Direction ◽  
Reaction Rate ◽  
Acid Phosphate ◽  
Fracture Surfaces ◽  
Al Content ◽  
Before And After ◽  
Relationship Of

The reaction rate and efficiency of piperazine to 1,4-diazabicyclo-octane (DABCO) depends on the Si/Al ratio of the MFI topology catalysts. The Al was shown to be the active site, however, in the Si/Al range of 30-200 the reaction rate increases as the Si/Al ratio increases. The objective of this work was to determine the location and concentration of Al to explain this inverse relationship of Al content with reaction rate.Two silicalite catalysts in the form of 1/16 inch SiO2/Al2O3 bonded extrudates were examined: catalyst A with a Si/Al of 83; and catalyst B, the acid/phosphate Al extracted form of catalyst A, with a Si/Al of 175. Five extrudates from each catalyst were fractured in the transverse direction and particles were obtained from the fracture surfaces near the center of the extrudate diameter. Particles were also obtained from the outside surfaces of five extrudates.

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