Graphical Method for Constraining the Local Stress State in Arbitrarily-Oriented Wells Using Drilling-Induced Tensile Fracture Observations

2021 ◽  
Author(s):  
A. Michael
Keyword(s):  
Stress State ◽  
Graphical Method ◽  
Local Stress ◽  
Tensile Fracture ◽  
Local Stress State

scholarly journals Development of Microstructures with Improved Cryogenic Toughness Through Local Variations in Stress State: Aluminum-Lithium Alloys

1990 ◽  
Vol 186 ◽  
Author(s):  
K. T. Venkateswara Rao ◽  
R. O. Ritchie
Keyword(s):  
Stress State ◽  
Sheet Material ◽  
Thin Sheet ◽  
Local Stress ◽  
Cryogenic Temperatures ◽  
Aluminum Lithium ◽  
Thin Sheet Material ◽  
Local Stress State ◽  
Crack Tip Constraint ◽  
Induced Changes

AbstractMicrostructurally-induced changes in the local stress state (triaxial constraint) and their effect on fracture-toughness behavior are examined at ambient and cryogenic temperatures in an Al-Li-Cu-Zr alloy, processed in the form of 12.7 mm-thick "naturally laminated" plate containing aligned-weak interfaces and 1.6 mm-thin unlaminated sheet. It is shown that marked improvements in long-transverse (L-T) toughness can be achieved in the plate material at cryogenic temperatures by promoting through-thickness delamination along these interfaces, which relaxes local constraint and promotes a fracture-mode transition from global plane strain to local plane stress. Conversely, in thin sheet material, the absence of such interface delamination leads to a reduction in toughness with decrease in temperature, consistent with the greater degree of crack-tip constraint.

Balance of Solvent and Chain Interactions Determines the Local Stress State of Simulated Membranes

2020 ◽  
Vol 124 (32) ◽  
pp. 6963-6971 ◽  
Author(s):  
Conner M. Winkeljohn ◽  
Benjamin Himberg ◽  
Juan M. Vanegas
Keyword(s):  
Stress State ◽  
Local Stress ◽  
Local Stress State

scholarly journals CALCULATION OF LOCAL STRESS STATE FOR SHELLS INTERSECTION

2016 ◽  
Vol 21 (1) ◽  
Author(s):  
ANGELA CHELU
Keyword(s):  
Stress State ◽  
Specific Energy ◽  
Nonlinear Behavior ◽  
Local Stress ◽  
Elastic Behavior ◽  
Calculation Methods ◽  
Linear Elastic ◽  
State Of Stress ◽  
Local Stress State ◽  
Current Calculation

<p>This paper presents current calculation methods in order to determine the state of stress in the nozzle – shell junction section, their peculiarities, and limitations. These can be applied only to the linear-elastic behavior of the materials components. In the case of nonlinear behavior, beyond the yield stress limit, there is proposed a calculation method based on the concept of specific energy participation.</p>

scholarly journals Local stress state of pipelines with misalignment connections

2019 ◽  
Vol 85 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Z. S. Yaskovets ◽  
І. P. Seliverstova ◽  
М. V. Borodii
Keyword(s):  
Stress State ◽  
Local Stress ◽  
Local Stress State

APPLICATION OF LOCAL SPECTRUM OF NATURAL OSCILLATIONS FOR MONITORING OF STRESS STATE IN NON-METALLIC ELEMENTS OF STRUCTURES

2020 ◽  
pp. 40-45
Author(s):  
A. M. Konovalov ◽  
V. I. Kugushev ◽  
S. S. Khudyakov ◽  
A. I. Yankevich
Keyword(s):  
Stress State ◽  
Frequency Spectrum ◽  
Local Stress ◽  
Flaw Detector ◽  
Natural Oscillations ◽  
Energy Redistribution ◽  
First Case ◽  
Local Stress State ◽  
Metallic Parts ◽  
Stress Variations

This work offers a method based on extraction of specially selected localized forms of oscillations from the general spectrum of frequencies of natural oscillations of a part by means of which non-destructive monitoring of stress state in various points of non-metallic parts is performed. Frequency spectrum is localized by use of special oscillation transducers with adjustable mechanic filter at the inlet before piezoelectric plate. Such filter allows both to extract localized frequency spectrum and to ensure adjustment of frequencies of natural oscillations of transducer rod wrt frequencies of natural oscillations of the part being monitored. The transducers operated as a part of acoustic impedance flaw detector «ДАМИ-С09». Stress variations at the points of the part were captured on the screen of the flaw detector by energy redistribution between the forms of natural oscillations of transducer rod. Captured energy redistribution between the forms of oscillations took place due to shift of frequencies of natural oscillations of the part during stress variation wrt to frequencies of natural oscillations of transducer rod and summing up of their amplitudes. Here, the amplitudes of some oscillations intensified and some subsided. The results which were experimentally gained during monitoring demonstrate variations of local stress state at the point on the perimeter of the square plate made of sphere plastic under effect of compressive stresses on the perimeter of the plate and in the centre. In the first case at the point of measurement “conditional compression” took place and in the second case it was “conditional tension”.

Sign in / Sign up

Export Citation Format

Share Document