scholarly journals Near-horizon local instability and quantum thermality

2020 ◽  
Vol 102 (12) ◽  
Author(s):  
Surojit Dalui ◽  
Bibhas Ranjan Majhi
Keyword(s):  
Local Instability

Fracture and local instability of thin-walled bodies with notches

1981 ◽  
Vol 17 (8) ◽  
pp. 707-722 ◽  
Author(s):  
A. N. Guz' ◽  
M. Sh. Dyshel' ◽  
G. G. Kuliev ◽  
O. B. Milovanova
Keyword(s):  
Local Instability ◽  
Thin Walled

Marginal local instability of quasi-periodic motion

1980 ◽  
Vol 77 (2-3) ◽  
pp. 91-94 ◽  
Author(s):  
Giulio Casati ◽  
Boris V. Chirikov ◽  
Joseph Ford
Keyword(s):  
Periodic Motion ◽  
Local Instability

DIMENSIONING OF ORTHOTROPICALLY STIFFENED CFRP SHELLS OF LARGE LAUNCH VEHICLES FOR LOAD INTRODUCTION AND STABILITY

2010 ◽  
Vol 10 (04) ◽  
pp. 601-621 ◽  
Author(s):  
ANDREAS RITTWEGER ◽  
SUSANNE CHRISTIANSON ◽  
HUBA ÖRY
Keyword(s):  
Analytical Methods ◽  
Flux Distribution ◽  
Fe Analysis ◽  
Launch Vehicles ◽  
Local Instability ◽  
Axial Loads ◽  
Ring Frame ◽  
Final Design ◽  
Shell Equations ◽  
Analytical Approaches

The dimensioning of an orthotropically stiffened cylindrical CFRP shell subjected to the introduction of concentrated axial loads using rapid analytical methods is presented. For stress calculation the shell equations are simplified by applying the semibending theory and integrated by employing the transfer matrix method. Analytical approaches are used for stability verification. The dimensioning considers required constraints in the force flux distribution, strength of the laminate, general instability, panel instability (from ring frame to ring frame) and local instability. The rapid analytical methods allow mass optimization. The final design is confirmed by detailed FE analysis. A comparison of the FE analysis with the analytical results is shown.

Global and local instability of flow focusing: The influence of the geometry

2010 ◽  
Vol 22 (6) ◽  
pp. 064105 ◽  
Author(s):  
Emilio J. Vega ◽  
José M. Montanero ◽  
Miguel A. Herrada ◽  
Alfonso M. Gañán-Calvo
Keyword(s):  
Local Instability ◽  
Flow Focusing ◽  
Global And Local

scholarly journals Effect of local instability on fire response of steel beams

2017 ◽  
Vol 1 (2) ◽  
pp. 170-179 ◽  
Author(s):  
Venkatesh Kodur ◽  
Mohannad Z. Naser
Keyword(s):  
Shear Loading ◽  
Shear Capacity ◽  
Valuable Insight ◽  
High Shear ◽  
Local Instability ◽  
Steel Girders ◽  
Fire Response ◽  
Limit States ◽  
Flexural Mode ◽  
Content Type

Purpose This purpose of this paper is to quantify the effect of local instability arising from high shear loading on response of steel girders subjected to fire conditions. Design/methodology/approach A three-dimensional nonlinear finite element model able to evaluate behavior of fire-exposed steel girders is developed. This model, is capable of predicting fire response of steel girders taking into consideration flexural, shear and deflection limit states. Findings Results obtained from numerical studies show that shear capacity can degrade at a higher pace than flexural capacity under certain loading scenarios, and hence, failure can result from shear effects prior to attaining failure in flexural mode. Originality/value The developed model is unique and provides valuable insight (and information) to the fire response of typical hot-rolled steel girder subjected to high shear loading.

Major landslide triggered by local instability

2020 ◽  
pp. 841-846
Author(s):  
Rolf Larsson ◽  
Elvin Ottosson ◽  
Göran Sällfors
Keyword(s):  
Local Instability

Non-local effects in the stability of flow between eccentric rotating cylinders

1972 ◽  
Vol 54 (3) ◽  
pp. 393-415 ◽  
Author(s):  
R. C. Diprima ◽  
J. T. Stuart
Keyword(s):  
Differential Equations ◽  
Stability Theory ◽  
Taylor Number ◽  
Circular Cylinders ◽  
Taylor Vortex ◽  
Local Theory ◽  
Local Instability ◽  
Clearance Ratio ◽  
Linearized Stability ◽  
The Stability

In this paper the linear stability of the flow between two long eccentric rotating circular cylinders is considered. The problem, which is of interest in lubrication technology, is an extension of the classical Taylor problem for concentric cylinders. The basic flow has components in the radial and azimuthal directions and depends on both of these co-ordinates. As a consequence the linearized stability equations arepartial differential equationsrather than ordinary differential equations. Thus standard methods of stability theory are not immediately useful. However, there are two small parameters in the problem, namely δ, the clearance ratio, and ε, the eccentricity. By letting these parameters tend to zero in such a way that δ½ is proportional to ε, a global solution to the stability problem is obtained without recourse to the concept of ‘local instability’, or ‘parallel-flow’ approximation, so commonly used in boundary-layer stability theory. It is found that the predictions of the present theory are at variance with what is given by a ‘local’ theory. First, the Taylor-vortex amplitude is found to be largest at about 90° downstream of the region of ‘maximum local instability’. This result is given support by some experimental observations of Vohr (1968) with δ = 0·1 and ε = 0·475, which yield a corresponding angle of about 50°. Second, the critical Taylor number rises with ε, rather than initially decreasing with ε as predicted by local stability theory using the criteria of maximum local instability. The present prediction of the critical Taylor number agrees well with Vohr's experiments for ε up to about 0·5 when δ = 0·01 and for ε up to about 0·2 when δ = 0.1.

Local Instability of Horizontally Curved Members

1970 ◽  
Vol 96 (2) ◽  
pp. 245-265
Author(s):  
Charles G. Culver ◽  
Ralph E. Frampton
Keyword(s):  
Local Instability ◽  
Horizontally Curved

Local instability ofp-type bonding makes amorphous GeTe a lone-pair semiconductor

2013 ◽  
Vol 87 (15) ◽  
Author(s):  
Alexander V. Kolobov ◽  
Paul Fons ◽  
Junji Tominaga
Keyword(s):  
Lone Pair ◽  
Local Instability

scholarly journals Application Research of Ground-Penetrating Radar in the Quality Inspection of Concrete Anti-seepage Panels

2019 ◽  
Vol 136 ◽  
pp. 04032
Author(s):  
Meng Li ◽  
Changde Ren ◽  
Lei Zhao ◽  
Shijiao Luo
Keyword(s):  
Ground Penetrating Radar ◽  
Rock Foundation ◽  
Quality Inspection ◽  
Local Instability ◽  
Application Research ◽  
Safe Operation ◽  
Ground Penetrating

If the sand-free cushion of concrete anti-seepage panels of reservoir is void, it will cause local instability or even crack and collapse of the panel, which will lead to large leakage of reservoir and affect the safe operation of the project. In this paper, the ground-penetrating radar (GPR) method is used to scan the concrete panel. The results show that the quality of the panel is good overall, the distribution of rebar is uniform, and the contact between the panel and the sand-free cushion is dense. Some panels have internal voids and the contact between the cushion and the rock foundation is not dense, while no obvious hollowing is found in the sand-free cushion.

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