Use of the method of finite elements to investigate the state of stress of a lining with an irregular cross section

1975 ◽  
Vol 11 (3) ◽  
pp. 255-259
Author(s):  
B. Z. Amusin ◽  
A. G. Olovyannyi ◽  
E. B. Revzyuk
Keyword(s):  
Finite Elements ◽  
Cross Section ◽  
The State ◽  
Method Of Finite Elements ◽  
State Of Stress

scholarly journals On The Calving of Ice From Floating Glaciers and Ice Shelves

1968 ◽  
Vol 7 (50) ◽  
pp. 215-232 ◽  
Author(s):  
Niels Reeh
Keyword(s):  
Cross Section ◽  
Elastic Material ◽  
Beam Theory ◽  
The State ◽  
Engineering Practice ◽  
Ice Shelves ◽  
State Of Stress ◽  
Frontal Part

The deformation and the state of stress in the frontal part of a floating glacier is analysed by a method analogous with the beam theory, applied in engineering practice for determining stresses and deflections of a beans of an elastic material. Very rough approximations are made, the most severe being that of assuming the viscosity of the ice constant. Curves showing the progress in time of the deflections and the stresses in the frontal part of the glacier are given for the case of an infinitely wide glacier. The curves show, that the stresses are greatest at a cross-section situated at a distance of about the thickness of the glacier from the front, and that the stresses are of a magnitude which very likely will lead to fracture, resulting in the formation of an iceberg. It is shown that the magnitude of the icebergs as well as the frequency of the calving is a function of the thickness, the density, and the temperature of the glacier. Observations from nature supporting the theory are described. Finally other calving mechanisms for floating glaciers are briefly discussed.

scholarly journals Análise da origem das manifestações patológicas em pavimento de concreto de uma rodovia pelo método dos elementos finitos: estudo de caso

2014 ◽  
Vol 4 (3) ◽  
pp. 172-181
Author(s):  
F. Bolina ◽  
B. Tutikian
Keyword(s):  
Structural Analysis ◽  
Finite Elements ◽  
Thermal Effects ◽  
Rio Grande ◽  
The State ◽  
Rio Grande Do Sul ◽  
Method Of Finite Elements ◽  
Pavement Concrete

RESUMONo que tange assuntos concernentes à infraestrutura, observa-se que a rodovia brasileira Mário Quintana, a chamada ERS-118, situada no estado do Rio Grande do Sul, Brasil, anuncia-se em circunstâncias alarmantes de conservação e trafegabilidade devido ao elevado grau de deterioração do pavimento. O objetivo deste trabalho é analisar as possíveis causas que culminaram no surgimento de manifestações patológicas nas placas de concreto desta rodovia. O estudo baseou-se na análise estrutural destes elementos. Para tanto, este trabalho fundamentou-se no método de dimensionamento por elementos finitos e na subsequente análise dos resultados pela correlação entre tensões produzidas versus número admissível de eixos passantes. O estudo foi dividido em três partes: (1º) método de análise estrutural das placas, (2º) discussão dos resultados e (3º) conclusão. Como resultado, verificou-se que muitas das manifestações patológicas podem ter provindo do efeito térmico resultante sobre as placas.Palavras clave: Patologia; Pavimentos; Concreto.ABSTRACTRegarding issues pertaining to infrastructure, it is observed that the Brazilian’s highway Mário Quintana, call ERS-118, located in the state of Rio Grande do Sul , Brazil , announces in alarming conservations circumstances and trafficability due to the high deterioration degree of the pavement . The objective of this work is to analyze the possible causes that produced the pathological manifestations in the pavement concrete. The study was based on the structural analysis of these elements. Therefore, this study was based on the method of finite elements and subsequent analysis of the results produced by the correlation between stress versus number of permissible axle bushings. The study was divided into three parts: (1) method of pavement’s structural analysis, (2) discussion of the results and (3) conclusion. As a result, it was found that many of the pathological manifestations may have stemmed from the thermal effects arising in the pavement concrete.Keywords: Pathology; Pavements; Concrete.

scholarly journals On The Calving of Ice From Floating Glaciers and Ice Shelves

1968 ◽  
Vol 7 (50) ◽  
pp. 215-232 ◽  
Author(s):  
Niels Reeh
Keyword(s):  
Cross Section ◽  
Elastic Material ◽  
Beam Theory ◽  
The State ◽  
Engineering Practice ◽  
Ice Shelves ◽  
State Of Stress ◽  
Frontal Part

The deformation and the state of stress in the frontal part of a floating glacier is analysed by a method analogous with the beam theory, applied in engineering practice for determining stresses and deflections of a beans of an elastic material. Very rough approximations are made, the most severe being that of assuming the viscosity of the ice constant. Curves showing the progress in time of the deflections and the stresses in the frontal part of the glacier are given for the case of an infinitely wide glacier. The curves show, that the stresses are greatest at a cross-section situated at a distance of about the thickness of the glacier from the front, and that the stresses are of a magnitude which very likely will lead to fracture, resulting in the formation of an iceberg. It is shown that the magnitude of the icebergs as well as the frequency of the calving is a function of the thickness, the density, and the temperature of the glacier. Observations from nature supporting the theory are described. Finally other calving mechanisms for floating glaciers are briefly discussed.

scholarly journals Half-plane contacts subject to remote tension

2021 ◽  
pp. 030932472098844
Author(s):  
Nils Cwiekala ◽  
David A Hills
Keyword(s):  
Contact Problem ◽  
Half Plane ◽  
Asymptotic Form ◽  
Fretting Fatigue ◽  
The State ◽  
Partial Slip ◽  
Practical Relevance ◽  
Plane Contact ◽  
State Of Stress ◽  
Plane Contact Problem

The state of stress present in an elastic half-plane contact problem, where one or both bodies is subject to remote tension has been investigated, both for conditions of full stick and partial slip. The state of stress present near the contact edges is studied for different loading scenarios in an asymptotic form. This is of practical relevance to the study of contacts experiencing fretting fatigue, and enables the environment in which cracks nucleate to be specified.

scholarly journals Effect of the Rock Stress on the Water Jet Cutting Performance

2021 ◽  
Author(s):  
Battista Grosso ◽  
Valentina Dentoni ◽  
Augusto Bortolussi
Keyword(s):  
Numerical Models ◽  
Step Function ◽  
Water Jet ◽  
The State ◽  
Cutting Performance ◽  
Lagrangian Analysis ◽  
State Of Stress ◽  
Water Jet Cutting ◽  
Cutting Rate ◽  
Available Technology

AbstractUnderground quarrying is rarely adopted for granite extraction due to the difficulties in the implementation of traditional technologies (drilling and explosive). As alternative to drilling and explosive, the combination of diamond wire and water jet seems to be the most promising available technology. The cutting performance achievable with the water jet technology depends on the operative parameters, the material characteristics and the state of stress within the rock massif. To assess the effect of the state of stress on the cutting rate, laboratory tests have been performed with an oscillating water jet machine on granite samples subjected to a static load. The stress distribution in the layer of rock to be removed has been evaluated by numerical simulation with the FLAC code (Fast Lagrangian Analysis of Continua). The correlation between the results of the cutting tests and the numerical models of the rock samples has been inferred. Starting from a conceptual model, which theoretically describes the relationship between the cutting rate and the stress, a step function was defined that indicates the ranges of stress where predefined values of the cutting rate are workable.

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