Numerical analysis of an influence of an active electric impact on a mechanical response of an electro-viscoelastic structure

2021 ◽  
Author(s):  
Maksim Iurlov ◽  
Natalia Sevodina ◽  
Dmitriy Oshmarin ◽  
Natalia Iurlova
Keyword(s):  
Numerical Analysis ◽  
Mechanical Response ◽  
Viscoelastic Structure

Numerical Analysis of Faults on Deep-Buried Tunnel Surrounding Rock Damaged Zones

2011 ◽  
Vol 90-93 ◽  
pp. 74-78 ◽  
Author(s):  
Jun Hu ◽  
Ling Xu ◽  
Nu Wen Xu
Keyword(s):  
Numerical Analysis ◽  
Mechanical Response ◽  
Progressive Failure ◽  
Process Analysis ◽  
Failure Process ◽  
Water Inrush ◽  
Surrounding Rock ◽  
Factors Affecting ◽  
Rock Failure Process ◽  
Tunnel Instability

Fault is one of the most important factors affecting tunnel instability. As a significant and casual construction of Jinping II hydropower station, when the drain tunnel is excavated at depth of 1600 m, rockbursts and water inrush induced by several huge faults and zone of fracture have restricted the development of the whole construction. In this paper, a progressive failure progress numerical analysis code-RFPA (abbreviated from Rock Failure Process Analysis) is applied to investigate the influence of faults on tunnel instability and damaged zones. Numerical simulation is performed to analyze the stress distribution and wreck regions of the tunnel, and the results are consistent with the phenomena obtained from field observation. Moreover, the effects of fault characteristics and positions on the construction mechanical response are studied in details. Some distribution rules of surrounding rock stress of deep-buried tunnel are summarized to provide the reasonable references to TBM excavation and post-support of the drain tunnel, as well as the design and construction of similar engineering in future.

scholarly journals NUMERICAL ANALYSIS OF THE WALL STRESS IN ABDOMINAL AORTIC ANEURYSM: INFLUENCE OF THE MATERIAL MODEL NEAR-INCOMPRESSIBILITY

2012 ◽  
Vol 12 (01) ◽  
pp. 1250005 ◽  
Author(s):  
MAMADOU TOUNGARA ◽  
GREGORY CHAGNON ◽  
CHRISTIAN GEINDREAU
Keyword(s):  
Finite Element ◽  
Abdominal Aortic Aneurysm ◽  
Numerical Analysis ◽  
Aortic Aneurysm ◽  
Maximum Stress ◽  
Mechanical Response ◽  
Wall Stress ◽  
Model Complexity ◽  
Anisotropic Models ◽  
Abdominal Aortic

Recently, hyperelastic mechanical models were proposed to well capture the aneurismal arterial wall anisotropic and nonlinear features experimentally observed. These models were formulated assuming the material incompressibility. However in numerical analysis, a nearly incompressible approach, i.e., a mixed formulation pressure-displacement, is usually adopted to perform finite element stress analysis of abdominal aortic aneurysm (AAA). Therefore, volume variations of the material are controlled through the volumetric energy which depends on the initial bulk modulus κ. In this paper, an analytical analysis of the influence of κ on the mechanical response of two invariant-based anisotropic models is first performed in the case of an equibiaxial tensile test. This analysis shows that for the strongly nonlinear anisotropic model, even in a restricted range of deformations, large values of κ are necessary to ensure the incompressibility condition, in order to estimate the wall stress with a reasonable precision. Finite element simulations on idealized AAA geometries are then performed. Results from these simulations show that the maximum stress in the AAA wall is underestimated in previous works, committed errors vary from 26% to 58% depending on the geometrical model complexity. In addition to affect the magnitude of the maximum stress in the aneurysm, we found that too small value of κ may also affect the location of this stress.

scholarly journals Modern design of light steel facades in normal and fire conditions

2018 ◽  
Vol 49 ◽  
pp. 00094
Author(s):  
Katarzyna Rzeszut ◽  
Andrii Voronoi
Keyword(s):  
High Temperature ◽  
Numerical Analysis ◽  
Material Properties ◽  
3D Model ◽  
Mechanical Response ◽  
Load Capacity ◽  
Structural Behaviour ◽  
Bearing Load ◽  
Temperature Time ◽  
Nominal Temperature

In this paper, numerical analysis of bearing load capacity of steel facade cassettes with special perforation in various geometrical configurations was carried out. Particular attention was focused on the influence analysis of the blade inclination and perforation pattern on the structural behaviour. The mechanical response was tested using two separate types of numerical analysis. First contains the analysis under high temperature using coupled thermal-structural analysis according to the nominal temperature-time External curves. In this study nonlinear physical relationships are taken into account, thus influence of high temperature on material properties is assumed. In order to investigate the wind action influence on the cassettes with respect to different blade inclination, the static was provided. The scope of the study includes the preparation of advanced numerical 3D model of thin-walled steel cassettes K1 produced by “Blachy Pruszynski” company using shell finite elements (FE) in Abaqus program.

Evaluation of reverse faulting effects on the mechanical response of tunnel lining using centrifuge tests and numerical analysis

Géotechnique ◽  
2020 ◽  
Vol 70 (6) ◽  
pp. 490-502 ◽  
Author(s):  
Mohammad Hassan Baziar ◽  
Ali Nabizadeh ◽  
Nader Khalafian ◽  
Chung Jung Lee ◽  
Wen Yi Hung
Keyword(s):  
Numerical Analysis ◽  
Mechanical Response ◽  
Tunnel Lining ◽  
Centrifuge Tests ◽  
Reverse Faulting

Mechanical Response of a Large Fuel Cell Stack to Impact: A Numerical Analysis

Fuel Cells ◽  
2015 ◽  
Vol 15 (2) ◽  
pp. 344-351 ◽  
Author(s):  
C.-W. Wu ◽  
B. Liu ◽  
M.-Y. Wei ◽  
W. Zhang
Keyword(s):  
Fuel Cell ◽  
Numerical Analysis ◽  
Mechanical Response ◽  
Fuel Cell Stack
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