scholarly journals Modelling the Depth of Jet Penetration in Abrasive Waterjet Contouring of Alumina Ceramics

2004 ◽  
Vol 471-472 ◽  
pp. 462-468
Author(s):  
Jun Wang ◽  
H. Liu ◽  
Chuan Zhen Huang
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Mathematical Models ◽  
Alumina Ceramic ◽  
Abrasive Waterjet ◽  
Alumina Ceramics ◽  
Predictive Capability ◽  
Jet Penetration ◽  
Good Agreement

Predictive mathematical models for the depth of jet penetration are presented for both straight-slit cutting and contouring by an abrasive waterjet (AWJ). The plausibility and predictive capability of the models are assessed and verified by an experimental investigation when cutting an 87% alumina ceramic. It shows that the predictions of the models are in good agreement with the experimental data.

scholarly journals Correlation between Paris function parameters to crack velocity for Alumina ceramics

2011 ◽  
Vol 8 (2) ◽  
pp. 326-332
Author(s):  
Baghdad Science Journal
Keyword(s):  
Experimental Data ◽  
Crack Growth ◽  
Exponential Function ◽  
Crack Velocity ◽  
Alumina Ceramic ◽  
Velocity Versus ◽  
Rate Theory ◽  
Alumina Ceramics ◽  
Region I ◽  
Different Grain Size

The question about the existence of correlation between the parameters A and m of the Paris function is re-examined theoretically for brittle material such as alumina ceramic (Al2O3) with different grain size. Investigation about existence of the exponential function which fit a good approximation to the majority of experimental data of crack velocity versus stress intensity factor diagram. The rate theory of crack growth was applied for data of alumina ceramics samples in region I and making use of the values of the exponential function parameters the crack growth rate theory parameters were estimated.

scholarly journals Generating Vectors for the Lattice Structures of Tubular and Conical Viral Capsids

2014 ◽  
Vol 2 (1) ◽  
pp. 128-140
Author(s):  
Farrah Sadre-Marandi ◽  
Jiangguo Liu ◽  
Simon Tavener ◽  
Chaoping Chen
Keyword(s):  
Experimental Data ◽  
Mathematical Models ◽  
Lattice Structure ◽  
Lattice Structures ◽  
Biological Mechanisms ◽  
Viral Capsids ◽  
New Models ◽  
Equivalence Theory ◽  
Hiv 1 ◽  
Good Agreement

Abstract Retrovirus capsid is a fullerene-like lattice consisting of capsid protein hexamers and pentamers. Mathematical models for the lattice structure help understand the underlying biological mechanisms in the formation of viral capsids. It is known that viral capsids could be categorized into three major types: icosahedron, tube, and cone. While the model for icosahedral capsids is established and well-received, models for tubular and conical capsids need further investigation. This paper proposes new models for the tubular and conical capsids based on an extension of the Capser-Klug quasi-equivalence theory. In particular, two and three generating vectors are used to characterize respectively the lattice structures of tubular and conical capsids. Comparison with published HIV-1 data demonstrates a good agreement of our modeling results with experimental data.

scholarly journals Profile Cutting on Alumina Ceramics by Abrasive Waterjet. Part 2: Cutting Performance Models

2006 ◽  
Vol 220 (5) ◽  
pp. 715-725 ◽  
Author(s):  
J Wang ◽  
H Liu
Keyword(s):  
Performance Measures ◽  
Predictive Models ◽  
Cutting Performance ◽  
Abrasive Waterjet ◽  
Depth Of Cut ◽  
Alumina Ceramics ◽  
Predictive Capability ◽  
Performance Models ◽  
Kerf Taper ◽  
Model Predictions

Predictive models for the major cutting performance measures, such as the kerf taper and depth of cut, are developed for both straight-slit cutting and profile cutting by an abrasive waterjet. The plausibility and predictive capability of the models are assessed and verified by comparing the model predictions with the corresponding experimental data. Very good correlations between the predicted and experimental results have been found, which confirm the adequacy of the models for use in process planning.

scholarly journals Enhancing the AWJ Cutting Performance by Multipass Machining with Controlled Nozzle Oscillation

2005 ◽  
Vol 291-292 ◽  
pp. 453-458 ◽  
Author(s):  
Jun Wang ◽  
S. Xu
Keyword(s):  
Experimental Investigation ◽  
Alumina Ceramic ◽  
Cutting Performance ◽  
Abrasive Waterjet ◽  
Depth Of Cut ◽  
Application Domain ◽  
Process Variables ◽  
Geometrical Features ◽  
Cutting Capacity ◽  
Awj Cutting

The cutting performance in abrasive waterjet (AWJ) multipass cutting with and without controlled nozzle oscillation is presented based on an experimental investigation cutting an 87% alumina ceramic. The cutting capacity in terms of the depth of cut and the kerf geometrical features is analyzed with respect to the process variables. It is found that multipass cutting is a viable means to increase the cutting performance and application domain of this technology, while a further increase in the cutting performance can be made by using a controlled nozzle oscillation technique.

Falling-Film Solidification Rates for Water inside a Short Vertical Tube

1972 ◽  
Vol 94 (3) ◽  
pp. 305-309 ◽  
Author(s):  
T. E. Mullin ◽  
R. B. Renda
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Temperature Difference ◽  
Film Flow ◽  
Vertical Tube ◽  
Falling Film ◽  
Reasonable Accuracy ◽  
Fusion Temperature ◽  
Ice Field ◽  
Good Agreement

The purpose of this investigation was twofold: (1) to present the results of an experimental investigation of the solidification rates for water at its fusion temperature in falling-film flow inside a short vertical tube and (2) to compare the experimental results to those predicted from the expression developed by London and Seban [1]. The experimental data were in good agreement with those values predicted by their expression when evaluated on a weight-of-ice-formed basis. However, the liquid-solid interface radius rs could be determined with reasonable accuracy only for large values of rs. It was shown that by increasing the temperature difference across the ice field, closer agreement was obtained in both cases. It is believed that erosion of the ice by the liquid falling film is responsible for most of the deviations.

An Experimental Investigation of the Static and Elastodynamic Responses of an Industrial Robotic Manipulator

1987 ◽  
Author(s):  
S. B. Choi ◽  
F. Sun ◽  
M. V. Gandhi ◽  
B. S. Thompson
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Mathematical Models ◽  
Test Procedure ◽  
Robotic Manipulators ◽  
Structural Elements ◽  
General Electric Company ◽  
Error Sources ◽  
Principal Characteristics ◽  
Electric Company

Abstract A methodology is presented herein for experimentally evaluating the static and elastodynamic responses of industrial robotic manipulators. The procedure enables estimates of the principal characteristics of these machines to be quantified in order to identify limitations in the structural elements of these designs. Furthermore, the proposed approach also provides experimental data with which to evaluate the predictive capabilities of the various mathematical models proposed in the literature for predicting the static and elastodynamic behavior of these systems. In order to demonstrate the test procedure, a General Electric Company P50 articulating robot was subjected to evaluation, the error sources identified and the associated errors quantified.

Transient Behavior of a Springless Flapper Valve: Closing Motion

1998 ◽  
Vol 120 (3) ◽  
pp. 678-684
Author(s):  
K. A. Temple ◽  
V. W. Goldschmidt ◽  
J. D. Jones
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Simultaneous Measurement ◽  
Transient Behavior ◽  
Analytical Investigation ◽  
Closing Time ◽  
Model Predictions ◽  
Good Agreement

The closing of a springless flapper valve was investigated in order to gain a better understanding of the transient behavior of the valve. An experimental investigation included simultaneous measurement of pressure and flapper velocity. An analytical investigation included the development of a model to predict the closing of the flapper valve. The flapper closing was experimentally determined to require from 18 to 24 percent of a cycle, and the model predictions were in good agreement with experimental data for the flapper closing time. The present study should be a useful contribution to future modeling of flapper valves and other springless valves.

scholarly journals Profile Cutting on Alumina Ceramics by Abrasive Waterjet. Part 1: Experimental Investigation

2006 ◽  
Vol 220 (5) ◽  
pp. 703-714 ◽  
Author(s):  
J Wang ◽  
H Liu
Keyword(s):  
Experimental Investigation ◽  
Performance Measures ◽  
Process Parameters ◽  
Cutting Performance ◽  
Cutting Process ◽  
Abrasive Waterjet ◽  
Depth Of Cut ◽  
Curvature Radius ◽  
Alumina Ceramics ◽  
Awj Cutting

An experimental investigation is presented of the various cutting performance measures, such as the kerf taper and depth of cut, in profile cutting on an 87 per cent alumina ceramic by abrasive waterjet (AWJ) over a wide range of process parameters. It is found that the taper angles on the two kerf walls produced in cutting AWJ of profiles are different in magnitude and exhibit different trends as the profile curvature radius varies. Moreover, the depth of cut increases with an increase in the curvature radius and approaches its maximum in straight cutting. The other process variables affect the cutting process in a way similar to that in straight cutting. Recommendations are finally made for the selection of process parameters in AWJ profile cutting of alumina ceramics. Predictive mathematical models for the major cutting performance measures that are essential for the optimization of the AWJ cutting process are reported in the subsequent part of this investigation.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

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