Experimental Determination of Casing Wear by Drill String Rotation

1975 ◽  
Vol 97 (2) ◽  
pp. 464-471 ◽  
Author(s):  
W. B. Bradley
Keyword(s):  
Wear Rate ◽  
Experimental Determination ◽  
Research Program ◽  
Drill Pipe ◽  
Drill String ◽  
Experimental Results ◽  
Casing Wear ◽  
Drilling Conditions ◽  
Consequent Increase

With the trend toward deeper objectives, the time spent drilling through casing has increased with a consequent increase in casing wear. As a result of the expanded importance of casing wear, a research program was undertaken to investigate means to predict the rate of casing wear and means to reduce this wear rate. This paper presents experimental results on the effectiveness of drill pipe rubbers in reducing rotational casing wear and measurements of the rate of casing wear by rotating tool joints and drill pipe rubbers under simulated drilling conditions. The results from this paper and the results from reference [1] have been used to develop techniques for predicting casing wear under field conditions. These techniques are reported in reference [2].

scholarly journals Experimental Determination of the Buckling Loads of Floating Ice Sheets

1983 ◽  
Vol 4 ◽  
pp. 260-265 ◽  
Author(s):  
D. S. Sodhi ◽  
F. D. Haynes ◽  
K. Kato ◽  
K. Hirayama
Keyword(s):  
Experimental Data ◽  
Boundary Conditions ◽  
Experimental Determination ◽  
Characteristic Length ◽  
Ice Sheets ◽  
Ice Sheet ◽  
Experimental Results ◽  
Buckling Loads ◽  
Data Points

Experiments were performed to determine the forces required to buckle a floating ice sheet pushing against structures of different widths. The characteristic length of each ice sheet was determined to enable a comparison to be made between the theoretical and experimental results.Most of the experimental data points are within the range of the theoretical values of normalized buckling loads for frictionless and hinged boundary conditions, which represent the extreme situations for ice-structure contact. Thus, the agreement between the theoretical and experimental buckling loads is considered to be good. Photographs of the buckled ice sheets show a resemblance to the theoretical mode of buckling.

scholarly journals Experimental Determination of the Buckling Loads of Floating Ice Sheets

1983 ◽  
Vol 4 ◽  
pp. 260-265 ◽  
Author(s):  
D. S. Sodhi ◽  
F. D. Haynes ◽  
K. Kato ◽  
K. Hirayama
Keyword(s):  
Experimental Data ◽  
Boundary Conditions ◽  
Experimental Determination ◽  
Characteristic Length ◽  
Ice Sheets ◽  
Ice Sheet ◽  
Experimental Results ◽  
Buckling Loads ◽  
Data Points

Experiments were performed to determine the forces required to buckle a floating ice sheet pushing against structures of different widths. The characteristic length of each ice sheet was determined to enable a comparison to be made between the theoretical and experimental results. Most of the experimental data points are within the range of the theoretical values of normalized buckling loads for frictionless and hinged boundary conditions, which represent the extreme situations for ice-structure contact. Thus, the agreement between the theoretical and experimental buckling loads is considered to be good. Photographs of the buckled ice sheets show a resemblance to the theoretical mode of buckling.

scholarly journals Experimental Determination of Fatigue Life of Automotive Jounce Bumper

2011 ◽  
Vol 462-463 ◽  
pp. 634-638 ◽  
Author(s):  
R.S. Sidhu ◽  
Aidy Ali ◽  
M.R. Hassan
Keyword(s):  
Fatigue Life ◽  
Experimental Determination ◽  
Automotive Industry ◽  
Compressive Load ◽  
Experimental Results ◽  
Controlled Environment ◽  
Safety And Reliability ◽  
Repetitive Loading

It is evident that most rubber components in the automotive industry are subjected to repetitive loading. Vigorous research is needed towards improving the safety and reliability of the components. The study is conducted on an automotive rubber jounce bumper with a rubber hardness of 60 IRHD. The test is conducted in displacement controlled environment under compressive load. The existing models by Kim, Harbour, Woo and Li are adopted to predict the fatigue life. The experimental results show strong similarities with the predicted models.

Experimental Determination of the Ultimate Strength of Box Girder Specimens

2016 ◽  
Author(s):  
Thomas Lindemann ◽  
Patrick Kaeding ◽  
Eldor Backhaus
Keyword(s):  
Finite Element ◽  
Experimental Determination ◽  
Ultimate Strength ◽  
Progressive Collapse ◽  
Bending Moment ◽  
Element Model ◽  
Experimental Results ◽  
Bending Test ◽  
Box Girder

The Finite Element Method (FEM) is a feasible tool to perform progressive collapse analyses of large structural systems. Despite enormous developments in finite element formulations and computer technologies the results of structural analyses should be validated against experimental results. In this paper the collapse behaviour of two identical box girder specimens is determined experimentally for the load case of pure longitudinal bending. The specimens are composed of stiffened plate panels and connected at either ends to a loading structure. Within a 4-point bending test a constant bending moment is applied to each specimen to determine the collapse behaviour even in the post-ultimate strength range. The results of the experimental determination of the ultimate strength are presented for the box girder specimens. To simulate the collapse behaviour a finite element model is used and validated against experimental results.

Friction Considerations in Rotary Shouldered Threaded Connections

2007 ◽  
Author(s):  
Catalin Teodoriu ◽  
Herschel McDonald ◽  
Charles Bollfrass
Keyword(s):  
Drill Pipe ◽  
Extreme Environments ◽  
Drill String ◽  
Directional Drilling ◽  
Frictional Properties ◽  
Threaded Connections ◽  
Safety Margins ◽  
Drill Pipes ◽  
Drilling Conditions ◽  
First Time

The new connection designs introduced by the drill pipe manufacturers (double shoulder connections, intelligent drill pipes or any new design for increased torque resistance) make the use of the Farr formula for calculating proper assembly torque more problematic. Additionally, severe drilling conditions like HPHT, directional drilling and extreme environments are affecting critical thread compound performance properties, which can make it impossible to attain the optimum makeup torque for the connection. The new drilling conditions are exposing the drill string components to higher loads and consequently reduce the safety margins. Since the makeup process is the only way to control and achieve the maximum tool joint loading capacity, it becomes important to understand the effect of friction on optimum makeup torque calculation. This paper presents a modified equation for optimum makeup torque calculation by using the latest research on thread compound frictional properties. Also, the thread compound lubrication mechanism will be explained. For the first time the thread turn load will be related to the optimum makeup torque. The paper will also explain why there is a need for a new API standard for determining thread compound frictional properties. The formula developed herein, based on experimental results, demonstrates that the newly introduced overall factor may differentiate between used and new connections.

scholarly journals $$\omega \rightarrow 3\pi $$ and $$\omega \pi ^{0}$$ transition form factor revisited

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
M. Albaladejo ◽  
◽  
I. Danilkin ◽  
S. Gonzàlez-Solís ◽  
D. Winney ◽  
...  
Keyword(s):  
Form Factor ◽  
Experimental Determination ◽  
Dalitz Plot ◽  
Transition Form Factor ◽  
Decay Amplitude ◽  
Experimental Results ◽  
Transition Form ◽  
Dispersive Analysis ◽  
Low Energies

AbstractIn light of recent experimental results, we revisit the dispersive analysis of the $$\omega \rightarrow 3\pi $$ ω → 3 π decay amplitude and of the $$\omega \pi ^0$$ ω π 0 transition form factor. Within the framework of the Khuri–Treiman equations, we show that the $$\omega \rightarrow 3\pi $$ ω → 3 π Dalitz-plot parameters obtained with a once-subtracted amplitude are in agreement with the latest experimental determination by BESIII. Furthermore, we show that at low energies the $$\omega \pi ^0$$ ω π 0 transition form factor obtained from our determination of the $$\omega \rightarrow 3\pi $$ ω → 3 π amplitude is consistent with the data from MAMI and NA60 experiments.

EXPERIMENTAL DETERMINATION OF POINT LOCALIZED TIME CORRELATION AND POWER SPECTRUM IN A FARADAY EXPERIMENT

2000 ◽  
Vol 10 (09) ◽  
pp. 2233-2244 ◽  
Author(s):  
C. CABEZA ◽  
C. NEGREIRA ◽  
A. C. SICARDI SCHIFINO ◽  
V. GIBIAT
Keyword(s):  
Power Spectrum ◽  
Experimental Determination ◽  
Time Domain ◽  
Cross Correlation ◽  
Period Doubling ◽  
Time Correlation ◽  
Experimental Results ◽  
Capacitive Transducer ◽  
Period Doubling Bifurcations

Experimental results from a classical Faraday experiment have been obtained using a point-localized measurement of the displacement of the fluid surface. We used a capacitive transducer as probe, and have been able to study the period-doubling bifurcations in time domain through the determination of cross-correlation and power spectrum.

scholarly journals III. An experimental determination of the variation with temperature of the critical velocity of flow of water in pipes

1903 ◽  
Vol 201 (331-345) ◽  
pp. 45-61 ◽  
Keyword(s):  
Experimental Determination ◽  
Critical Velocity ◽  
Experimental Results ◽  
Experimental Side ◽  
The Subject ◽  
Theory And Experiment

The motion of water in pipes and channels has been the subject of frequent investigation, both from the theoretical and the experimental side, and it is well known that while in some cases theory and experiment are in exact accord, yet in many others the experimental results differ widely from the calculated. In some cases, while the theory holds for one set of conditions, it is found not to hold for conditions which at first do not appear to be fundamentally different.

Optical characteristics of a two-cylinder electrostatic lens

1946 ◽  
Vol 42 (2) ◽  
pp. 106-126 ◽  
Author(s):  
L. S. Goddard
Keyword(s):  
Experimental Determination ◽  
Theoretical Study ◽  
Optical Devices ◽  
Experimental Results ◽  
Optical Characteristics ◽  
Electrostatic Lens ◽  
Precise Formulation ◽  
The Subject ◽  
The Relationship

In this paper formulae are developed for the first and second focal lengths, and the positions of the first and second principal planes of a type of electrostatic lens which has been the subject of study (mostly experimental) in several previous papers. The lens, which is commonly used in electron optical devices, lends itself to a theoretical study, although this does not appear to have been attempted before. It consists of two equal semi-infinite cylinders placed end to end so that their axes coincide and the ends are separated by a small gap. If the cylinders are at potentials V1 and V2 and we write σ = V2/V1, the system behaves as an electron lens when σ > 0 and as an electron mirror when σ < 0. In the latter case some experimental results have been given by Nicoll(1) who also studied the focusing action in the case σ > 0 and, in particular, the formation of intermediate images when σ ≪ 1 and when σ ≫ 1. But for the precise formulation of the relationship between σ and the number of cross-overs a theoretical study, based on the paraxial equation, would be necessary. The problem will be indicated below. An experimental determination of the lens characteristics for values of σ from about 2 to 15 and for several gap widths has been made by Spangenberg(2), whose results will be compared with those obtained in the present paper. The two-cylinder lens has also been studied by Klemperer and Wright(3) using an experimental and a numerical (trigonometrical) method, and some crude analytical results have been given by Gray(4).

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