Stress–Strain State and Stability of a Flexible Circular Cylindrical Shell with Transverse Shear Strains*

2021 ◽  
Author(s):  
E. A. Storozhuk
Keyword(s):  
Cylindrical Shell ◽  
Transverse Shear ◽  
Strain State ◽  
Circular Cylindrical Shell ◽  
Stress Strain ◽  
Stress Strain State ◽  
Shear Strains ◽  
Transverse Shear Strains

scholarly journals Early Manifestations of Short-Term Precursors in Stress-Strain State Dynamics of Southern California

2021 ◽  
Vol 57 (4) ◽  
pp. 508-519
Author(s):  
V. G. Bondur ◽  
M. B. Gokhberg ◽  
I. A. Garagash ◽  
D. A. Alekseev
Keyword(s):  
Strain State ◽  
Southern California ◽  
Surrounding Medium ◽  
Maximum Amplitude ◽  
Theoretical Models ◽  
Time Intervals ◽  
Stress Strain ◽  
Epicentral Zone ◽  
Stress Strain State ◽  
Shear Strains

Abstract—The stress-strain state before the М = 7.1 Ridgecrest earthquake in Southern California is analyzed based on spatiotemporal distribution of shear strains calculated in the geomechanical model within local ~100 × 100 km crustal segments at a depth of 3–7 km. In the epicentral zone of the earthquake, starting from three years before the event, a successive series of the time intervals, up to the occurrence of the earthquake, when shear deformations are completely absent and rocks are farthest from ultimate strength—the so-called quiescence zones—are established. The spatial distribution of shear strains in the vicinity of the epicentral zone is analyzed during the quiescence intervals and subsequent bursts of maximum amplitude in the epicentral zone itself. The time intervals of the bursts are called excursions. The successive emergence of maxima in shear strain amplitudes in the epicentral zone and surrounding medium during the excursions corresponds to the situation of a swing when the entire preparation region of a future earthquake is rocking up to the moment of event. Consistency of the obtained results with the existing theoretical models of earthquake preparation is discussed.

scholarly journals Stress-Strain State of a Cylindrical Shell of a Tunnel Using Construction Stage Analysis

2019 ◽  
Vol 21 (3) ◽  
pp. 72-76
Author(s):  
Sergey B. Kosytsyn ◽  
Vladimir Y. Akulich
Keyword(s):  
Cylindrical Shell ◽  
Comparative Analysis ◽  
Static Analysis ◽  
Strain State ◽  
Computational Models ◽  
Stress Strain ◽  
Construction Stage ◽  
Stress Strain State ◽  
Slurry Shield ◽  
Stage Analysis

The work is aimed at research of the stress-strain state of a cylindrical shell of a tunnel using the non-linear static analysis and construction stage analysis. Research is carried out on the example of determining the stress-strain state of the tubing (shells) of the main line tunnel, constructed using a tunnel powered complex (slurry shield). Based on obtained results, a comparative analysis of the computational models with the corresponding conclusions is presented.

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