scholarly journals Stress Field Interactions Between Overlapping Shield Volcanoes: Borehole Breakout Evidence From the Island of Hawai'i, USA

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
Simona Pierdominici ◽  
John M. Millett ◽  
Jochem K. M. Kück ◽  
Donald Thomas ◽  
Dougal A. Jerram ◽  
...  
Keyword(s):  
Stress Field ◽  
Borehole Breakout ◽  
Shield Volcanoes

European stress: contributions from borehole breakouts

1991 ◽  
Vol 337 (1645) ◽  
pp. 165-179 ◽  
Keyword(s):  
Stress Field ◽  
Geographical Distribution ◽  
Rock Stress ◽  
Tectonic Structures ◽  
Stress Indicators ◽  
Borehole Breakout ◽  
Stress Orientations ◽  
Borehole Breakouts ◽  
Depth Distributions

Before about 1986 European measurements of rock stresses were sparse. The development of the borehole breakout method has facilitated a dramatic increase in the geographical distribution of rock stress orientations. These are derived from data collected routinely for other purposes by the oil, coal and gas industries over many years. Borehole breakouts can be interpreted in term s of the orientation of the stress field in boreholes as a function of depth, with the findings related to known stratigraphical boundaries, tectonic structures, fault and fracture occurrences, and to other geological and geophysical stress indicators. Geographical and depth distributions of stress on local and regional scales are beginning to provide the necessary base from which broad interpretive stress field models can be constructed.

Observation of secondary slip systems in tungsten bicrystals

1984 ◽  
Vol 42 ◽  
pp. 478-479
Author(s):  
J. R. Fekete ◽  
R. Gibala
Keyword(s):  
Stress Field ◽  
Grain Boundaries ◽  
Deformation Behavior ◽  
Stress Axis ◽  
Polycrystalline Materials ◽  
Slip Systems ◽  
Metallic Materials ◽  
Twist Boundary ◽  
Secondary Slip ◽  
Plane Normal

The deformation behavior of metallic materials is modified by the presence of grain boundaries. When polycrystalline materials are deformed, additional stresses over and above those externally imposed on the material are induced. These stresses result from the constraint of the grain boundaries on the deformation of incompatible grains. This incompatibility can be elastic or plastic in nature. One of the mechanisms by which these stresses can be relieved is the activation of secondary slip systems. Secondary slip systems have been shown to relieve elastic and plastic compatibility stresses. The deformation of tungsten bicrystals is interesting, due to the elastic isotropy of the material, which implies that the entire compatibility stress field will exist due to plastic incompatibility. The work described here shows TEM observations of the activation of secondary slip in tungsten bicrystals with a [110] twist boundary oriented with the plane normal parallel to the stress axis.

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