scholarly journals An influence of normal stress and pore pressure on the conditions and dynamics of shear crack propagation in brittle solids

2016 ◽  
Author(s):  
Evgeny V. Shilko ◽  
Sergey G. Psakhie ◽  
Valentin L. Popov
Keyword(s):  
Crack Propagation ◽  
Normal Stress ◽  
Pore Pressure ◽  
Shear Crack ◽  
Brittle Solids

scholarly journals A Study of Shear Crack Propagation in Spring-loaded DCB Testing

1978 ◽  
Vol 64 (7) ◽  
pp. 937-946 ◽  
Author(s):  
Yoshiyuki KURITA ◽  
Toshiya AKIYAMA ◽  
Takahiro FUJITA ◽  
Fusao KOSHIGA
Keyword(s):  
Crack Propagation ◽  
Shear Crack

Two types of reservoir-induced seismicity

1988 ◽  
Vol 78 (6) ◽  
pp. 2025-2040
Author(s):  
D.W. Simpson ◽  
W.S. Leith ◽  
C.H. Scholz
Keyword(s):  
Normal Stress ◽  
Pore Pressure ◽  
Induced Seismicity ◽  
Elastic Stress ◽  
Pore Space ◽  
Temporal Distribution ◽  
The Other ◽  
Elastic Response ◽  
Reservoir Induced Seismicity ◽  
Effective Normal Stress

Abstract The temporal distribution of induced seismicity following the filling of large reservoirs shows two types of response. At some reservoirs, seismicity begins almost immediately following the first filling of the reservoir. At others, pronounced increases in seismicity are not observed until a number of seasonal filling cycles have passed. These differences in response may correspond to two fundamental mechanisms by which a reservoir can modify the strength of the crust—one related to rapid increases in elastic stress due to the load of the reservoir and the other to the more gradual diffusion of water from the reservoir to hypocentral depths. Decreased strength can arise from changes in either elastic stress (decreased normal stress or increased shear stress) or from decreased effective normal stress due to increased pore pressure. Pore pressure at hypocentral depths can rise rapidly, from a coupled elastic response due to compaction of pore space, or more slowly, with the diffusion of water from the surface.

Stability of intersonic shear crack propagation

2003 ◽  
Vol 51 (11-12) ◽  
pp. 1957-1970 ◽  
Author(s):  
O. Obrezanova ◽  
J.R. Willis
Keyword(s):  
Crack Propagation ◽  
Shear Crack

A Study of Shear Crack Propagation in Gas-Pressurized Pipelines

1982 ◽  
Vol 104 (4) ◽  
pp. 338-343 ◽  
Author(s):  
E. Sugie ◽  
M. Matsuoka ◽  
T. Akiyama ◽  
H. Mimura ◽  
Y. Kawaguchi
Keyword(s):  
Crack Propagation ◽  
Crack Velocity ◽  
Shear Crack ◽  
Controlled Rolling ◽  
Full Scale ◽  
Pipe Length ◽  
On Line ◽  
Pressurized Pipelines ◽  
Quenching And Tempering ◽  
Crack Propagation And Arrest

Full-scale burst tests were carried out five times on line pipes of 48 in. o.d. × 0.720 in. w.t., Grad. X-70 manufactured by the controlled rolling and the quenching and tempering processes. It was found that the critical notch ductility for arresting a shear crack depends on the pipe length within which the crack is to be arrested. This result is well explained by solving the equation which governs change of crack velocity. The behavior of shear crack propagation and arrest can be well analyzed regardless of the existence or nonexistence of separation by Charpy energy.

Shear crack propagation under cohesive-type tractions

1978 ◽  
Vol 30 (1-2) ◽  
pp. 1-16 ◽  
Author(s):  
Lim Chee-Seng
Keyword(s):  
Crack Propagation ◽  
Shear Crack

scholarly journals Biaxial Shear Crack Propagation Modes of Rock-Like Specimens with Prefabricated Fissures and Their Strength Characteristics

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Nai-Zhong Xu ◽  
Chang-Qing Liu ◽  
You-Jian Wang ◽  
Hong-Bin Dang
Keyword(s):  
Shear Strength ◽  
Crack Propagation ◽  
Shear Crack ◽  
Crack Coalescence ◽  
Strength Characteristics ◽  
Propagation Mode ◽  
Peak Shear Strength ◽  
Shear Cracks ◽  
Tensile Shear ◽  
Dip Angle

A biaxial shear test is performed on prefabricated, single-fissure type, cubic rock-like specimens by using the TZW-500 rock direct shear apparatus to study the shear strength characteristics, crack coalescence, and propagation modes of the specimens with different geometric parameters. Results show that the crack coalescence and propagation modes of the rock-like specimens with prefabricated fissures can be divided into four types, namely, single main shear crack coalescence mode, main shear crack coalescence and secondary tensile-shear crack propagation mode, main shear crack coalescence and secondary shear crack propagation mode, and main shear crack coalescence and secondary tensile crack propagation mode. All modes are affected by the dip angle α and length l of the prefabricated fissure. When the dip angle of the prefabricated fissure is α∈[0°, 20°) or (70°, 90°], the cracks center on shear failure, and most shear cracks propagate along one end of the prefabricated fissure. At α∈(30°, 50°), the cracks bear the tensile-shear combined action, and the shear cracks propagate along the two ends of the prefabricated fissure. The peak shear strength of the rock-like specimens with prefabricated fissures is also closely related to the dip angle α and length l of the fissure. With the increase in dip angle α of the prefabricated fissure, the peak shear strength of each rock-like specimen decreases initially then increases, and the peak shear strength curve presents a similar “U” shape. At α∈[30°, 60°], the peak shear strength is within the peak-valley interval. When the length l of the prefabricated fissure is increased, the peak shear strength experiences a gradual reduction. When l > 20 mm, the peak shear strength is greatly influenced by l, but the influence is minimal when l ≥ 20 mm. At the same dip angle α and fissure length of l ≥ 20 mm, the correlation between peak shear strength and fissure width b is low.

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