scholarly journals Pre-failure behaviour of reconstituted peats in triaxial compression

2020 ◽  
Author(s):  
S. Muraro ◽  
C. Jommi
Keyword(s):  
Triaxial Compression ◽  
Failure Behaviour

Failure behaviour of cladding made from Sv 07Kh25N13 austenitic stainless steel

2021 ◽  
Vol 189 ◽  
pp. 104275
Author(s):  
J. Štefan ◽  
J. Siegl ◽  
J. Adámek ◽  
R. Kopřiva ◽  
M. Kytka
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Failure Behaviour

Study on mechanical properties and damage evolution of carbonaceous shale under triaxial compression with acoustic emission

2021 ◽  
pp. 105678952199119
Author(s):  
Kai Yang ◽  
Qixiang Yan ◽  
Chuan Zhang ◽  
Wang Wu ◽  
Fei Wan
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Water Content ◽  
Damage Evolution ◽  
Damage Assessment ◽  
Triaxial Compression ◽  
Confining Pressure ◽  
Damage Variable ◽  
Natural State ◽  
Carbonaceous Shale

To explore the mechanical properties and damage evolution characteristics of carbonaceous shale with different confining pressures and water-bearing conditions, triaxial compression tests accompanied by simultaneous acoustic emission (AE) monitoring were conducted on carbonaceous shale rock specimens. The AE characteristics of carbonaceous shale were investigated, a damage assessment method based on Shannon entropy of AE was further proposed. The results suggest that the mechanical properties of carbonaceous shale intensify with increasing confining pressure and degrade with increasing water content. Moisture in rocks does not only weaken the cohesion but also reduce the internal friction angle of carbonaceous shale. It is observed that AE activities mainly occur in the post-peak stage and the strong AE activities of saturated carbonaceous shale specimens appear at a lower normalized stress level than that of natural-state specimens. The maximum AE counts and AE energy increase with water content while decrease with confining pressure. Both confining pressure and water content induce changes in the proportions of AE dominant frequency bands, but the changes caused by confining pressure are more significant than those caused by water content. The results also indicate that AE entropy can serve as an applicable index for rock damage assessment. The damage evolution process of carbonaceous shale can be divided into two main stages, including the stable damage development stage and the damage acceleration stage. The damage variable increases slowly accompanied by a few AE activities at the first stage, which is followed by a rapid growth along with intense acoustic emission activities at the damage acceleration stage. Moreover, there is a sharp rise in the damage evolution curve for the natural-state specimen at the damage acceleration stage, while the damage variable develops slowly for the saturated-state specimen.

A new nonlinear empirical strength criterion for rocks under conventional triaxial compression

2021 ◽  
Vol 28 (5) ◽  
pp. 1448-1458
Author(s):  
Shi-jie Xie ◽  
Hang Lin ◽  
Yi-fan Chen ◽  
Yi-xian Wang
Keyword(s):  
Triaxial Compression ◽  
Strength Criterion ◽  
Conventional Triaxial Compression
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