scholarly journals The stress‐memory effect of fracture stiffness during cyclic loading in low‐permeability sandstone

2021 ◽  
Author(s):  
Christian Kluge ◽  
Guido Blöcher ◽  
Hannes Hofmann ◽  
Auke Barnhoorn ◽  
Jean Schmittbuhl ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Memory Effect ◽  
Low Permeability ◽  
Stress Memory ◽  
Fracture Stiffness

scholarly journals Influence of the Cyclic Loading Path on Rock Deformation Memory Effect

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Lingwei Zhong ◽  
Haijun Wang ◽  
Xuhua Ren ◽  
Lei Tang
Keyword(s):  
Cyclic Loading ◽  
Memory Effect ◽  
Sliding Friction ◽  
Pulse Amplitude ◽  
Cyclic Stress ◽  
In Situ Stress ◽  
Friction Model ◽  
Loading Path ◽  
Rate Analysis

Deformation rate analysis utilizes deformation memory effect (DME) that is one of the fundamental properties of rock, to estimate in situ stress underground. It could be influenced by the stress history which has been subjected to in the past. To understand the influence under the cyclic loading path, in the experimental study, different stress levels were applied on sandstone samples and two types of granite samples. In the theoretical investigation, the sliding friction model consisting of multiple microstructure surfaces is considered in this paper. Both experiments and the theoretical model show that when the number of cyclic loading times keeps increasing, (1) the stress read at the DRA inflection is getting closer to the previously cyclic stress; (2) the angle at the DRA inflection becomes sharper, which gives clearer inflection point; and (3) the strain differential amplitude in the DRA curve gradually decreases and then toward a stable value. An upper limit exists for influence, indicating that the best cyclic loading times occur when the pulse amplitude of the strain differential stops changing. It is confirmed that the multiple cyclic loading method provides a better outcome for experiment using artificial preload when DME is utilized for stress reconstruction. Without other factors disturbing, the memory information of the in situ stress would hardly lose under the history of cyclic loading.

Stress memory effect in viscoelastic stagnant lid convection

2017 ◽  
Vol 209 (3) ◽  
pp. 1462-1475 ◽  
Author(s):  
V. Patočka ◽  
O. Čadek ◽  
P.J. Tackley ◽  
H. Čížková
Keyword(s):  
Memory Effect ◽  
Stress Memory

Acoustic Emission Memory Effect in Coal Samples under Uniaxial Cyclic Loading

2006 ◽  
Vol 47 (2) ◽  
pp. 236-240 ◽  
Author(s):  
V. L. Shkuratnik ◽  
Yu. L. Filimonov ◽  
S. V. Kuchurin
Keyword(s):  
Acoustic Emission ◽  
Cyclic Loading ◽  
Memory Effect

Peculiarities of the deformation of alloys with the shape memory effect in nonsteady cyclic loading

1983 ◽  
Vol 15 (1) ◽  
pp. 84-88
Author(s):  
S. P. Belyaev ◽  
Z. P. Kamentseva ◽  
V. A. Likhachev
Keyword(s):  
Cyclic Loading ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect

Use of 2½ D imaging in analysis of NiTi martensite

1978 ◽  
Vol 36 (1) ◽  
pp. 610-611
Author(s):  
G. M. Michal
Keyword(s):  
Memory Effect ◽  
Monoclinic Phase ◽  
Reaction Path ◽  
Structural Characteristics ◽  
Salient Feature ◽  
Martensite Phase ◽  
Orientation Relationships ◽  
Low Symmetry ◽  
Hydride Phases ◽  
Unusual Shape

Several TEM investigations have attempted to correlate the structural characteristics to the unusual shape memory effect in NiTi, the consensus being the essence of the memory effect is ostensible manifest in the structure of NiTi transforming martensitic- ally from a B2 ordered lattice to a low temperature monoclinic phase. Commensurate with the low symmetry of the martensite phase, many variants may form from the B2 lattice explaining the very complex transformed microstructure. The microstructure may also be complicated by the enhanced formation of oxide or hydride phases and precipitation of intermetallic compounds by electron beam exposure. Variants are typically found in selfaccommodation groups with members of a group internally twinned and the twins themselves are often observed to be internally twinned. Often the most salient feature of a group of variants is their close clustering around a given orientation. Analysis of such orientation relationships may be a key to determining the nature of the reaction path that gives the transformation its apparently perfect reversibility.

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