scholarly journals Prediction of Tensile Strength of Rock from Fracture Toughness or Effective Surface Energy.

1978 ◽  
Author(s):  
R. A. Schmidt ◽  
A. R. Ingraffea
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Surface Energy ◽  
Effective Surface ◽  
Effective Surface Energy

Mechanism of preferential nucleation of [\bf 1{\overline 1}0{\overline 3}]-oriented GaN twins on an SiO2-patternedm-plane sapphire substrate

2015 ◽  
Vol 48 (1) ◽  
pp. 195-199 ◽  
Author(s):  
Hansub Yoon ◽  
Miyeon Jue ◽  
Hyemi Lee ◽  
Sanghwa Lee ◽  
Chinkyo Kim
Keyword(s):  
Growth Rate ◽  
Surface Energy ◽  
Sapphire Substrate ◽  
Legendre Transformation ◽  
Growth Morphology ◽  
Effective Surface ◽  
Crystalline Domain ◽  
Preferential Nucleation ◽  
Effective Surface Energy

The mechanism of preferential nucleation of [1{\overline 1}0{\overline 3}]-oriented GaN faceted twins on an SiO2-patternedm-plane sapphire substrate was investigated. Each variant of twins, which were enclosed byc- andm-facets, was observed to be preferentially nucleated over the opposite sides of an SiO2pattern. It was hypothesized, from the fact that the same method of Legendre transformation is applied to a Wulff plot and a kinetic Wulff plot to determine the growth morphology of a crystalline domain, that theeffectivesurface energy ofc- andm-facets would be proportional to the growth rate of the respective facet. On the basis of this hypothesis, minimization of the effective surface energy of a nucleated domain was proposed as a mechanism of preferential nucleation. This proposed mechanism successfully explained the preferential nucleation behaviour.

Determination of effective surface energy of dynamic failure

1992 ◽  
Vol 24 (7) ◽  
pp. 441-444
Author(s):  
Yu. A. Kostandov ◽  
L. Ya. Lokshina ◽  
S. I. Fedorkin
Keyword(s):  
Surface Energy ◽  
Dynamic Failure ◽  
Effective Surface ◽  
Effective Surface Energy

New contributions to the effective surface energy of cleavage

1985 ◽  
Vol 19 (3) ◽  
pp. 295-298 ◽  
Author(s):  
William W. Gerberich ◽  
Eric Kurman
Keyword(s):  
Surface Energy ◽  
Effective Surface ◽  
Effective Surface Energy

scholarly journals Drifting inwards in protoplanetary discs I Sticking of chondritic dust at increasing temperatures

2020 ◽  
Vol 638 ◽  
pp. A151
Author(s):  
T. Bogdan ◽  
C. Pillich ◽  
J. Landers ◽  
H. Wende ◽  
G. Wurm
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Cold Water ◽  
Aggregate Size ◽  
Effective Surface ◽  
Higher Temperature ◽  
The Stability ◽  
Early Phases ◽  
Effective Surface Energy ◽  
Protoplanetary Discs

Sticking properties rule the early phases of pebble growth in protoplanetary discs in which grains regularly travel from cold, water-rich regions to the warm inner part. This drift affects composition, grain size, morphology, and water content as grains experience ever higher temperatures. In this study we tempered chondritic dust under vacuum up to 1400 K. Afterwards, we measured the splitting tensile strength of millimetre-sized dust aggregates. The deduced effective surface energy starts out as γe = 0.07 J m−2. This value is dominated by abundant iron-oxides as measured by Mössbauer spectroscopy. Up to 1250 K, γe continuously decreases by up to a factor five. Olivines dominate at higher temperature. Beyond 1300 K dust grains significantly grow in size. The γe no longer decreases but the large grain size restricts the capability of growing aggregates. Beyond 1400 K aggregation is no longer possible. Overall, under the conditions probed, the stability of dust pebbles would decrease towards the star. In view of a minimum aggregate size required to trigger drag instabilities it becomes increasingly harder to seed planetesimal formation closer to a star.

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