Analysis of Force Components in Bar Turning

1973 ◽  
Vol 95 (4) ◽  
pp. 960-964
Author(s):  
A. B. Husein ◽  
M. F. DeVries ◽  
S. M. Wu
Keyword(s):  
Separation Method ◽  
Equilibrium Equations ◽  
Oblique Cutting ◽  
Contact Surfaces ◽  
Force Components ◽  
Bar Turning

This paper presents the development of equilibrium equations permitting the determination of the force components at each of the chip-tool-workpiece contact surfaces in bar turning. The analysis is an extension of the force separation method developed for the oblique cutting of tubes. The solution presented is applicable to both bar and tube cutting and was experimentally evaluated. The bar turning data produced solutions that compared favorably with tube turning data obtained.

scholarly journals Calculation of thin isotropic shells beyond the elastic limit by the method of elastic solutions

2018 ◽  
Vol 196 ◽  
pp. 01014 ◽  
Author(s):  
Avgustina Astakhova
Keyword(s):  
Elastic Limit ◽  
Physical Nonlinearity ◽  
Elasticity Tensor ◽  
Thin Shells ◽  
Equilibrium Equations ◽  
Spherical Shells ◽  
Plastic Deformations ◽  
Elastic Plastic ◽  
Internal Forces

The paper focuses on the model of calculation of thin isotropic shells beyond the elastic limit. The determination of the stress-strain state of thin shells is based on the small elastic-plastic deformations theory and the elastic solutions method. In the present work the building of the solution based on the equilibrium equations and geometric relations of linear theory of thin shells in curved coordinate system α and β, and the relations between deformations and forces based on the Hirchhoff-Lave hypothesis and the small elastic-plastic deformations theory are presented. Internal forces tensor is presented in the form of its expansion to the elasticity tensor and the additional terms tensor expressed the physical nonlinearity of the problem. The functions expressed the physical nonlinearity of the material are determined. The relations that allow to determine the range of elastic-plastic deformations on the surface of the present shell and their changing in shell thickness are presented. The examples of the calculation demonstrate the convergence of elastic-plastic deformations method and the range of elastic-plastic deformations in thickness in the spherical shell. Spherical shells with the angle of half-life regarding 90 degree vertical symmetry axis under the action of equally distributed ring loads are observed.

DETERMINATION OF BOTANICAL COMPOSITION OF TWO-COMPONENT FORAGE MIXTURES

1960 ◽  
Vol 40 (2) ◽  
pp. 225-234 ◽  
Author(s):  
J. W. Tanner ◽  
E. E. Gamble ◽  
W. E. Tossell
Keyword(s):  
Unit Cost ◽  
Estimation Method ◽  
Separation Method ◽  
Botanical Composition ◽  
Visual Estimation ◽  
Two Component ◽  
Late Maturity ◽  
The Difference ◽  
Forage Mixtures

A comparative study was made in 1958 of the visual estimation and hand separation methods of determining botanical composition of two-component forage mixtures. The results indicated that there were positive significant correlations between the per cent legume values obtained by the two methods. The visual estimation method was less variable than the hand separation method and the precision per unit cost was greater. The differences between per cent legume values obtained by the two methods were influenced by the stage of maturity (medium or late hay) of the components and the cut (hay or aftermath). In this study, the difference was significant only in the medium aftermath cut.Individually, three observers showed some inconsistencies between estimates on the medium and late maturity groups and between the hay and aftermath cut. However, by averaging the three estimates to obtain a mean sample, these inconsistencies were minimized.Both methods were more precise in the aftermath pasture cut than in the hay. An additional observer increased precision of the visual estimate more than an additional replicate or sample. The greater precision resulting from additional replicates, samples, or observers increased at a decreasing rate. The number of replicates, samples, and observers required for specific degrees of precision and a specific cost were calculated.The experiment showed that the visual estimation method can be superior to the hand separation method as a means of determining botanical composition.

Determination of the Milling Conditions of a Pump Casing Cover Using a Parametric Designed Fixture Device

2015 ◽  
Vol 809-810 ◽  
pp. 890-895
Author(s):  
Ionuţ Ghionea ◽  
Adrian Ghionea ◽  
Saša Ćuković ◽  
Nicolae Ionescu
Keyword(s):  
Working Conditions ◽  
Computer Aided Design ◽  
Fem Analysis ◽  
Milling Process ◽  
Milling Tool ◽  
Cutting Force Components ◽  
Force Components ◽  
Aided Design ◽  
Tool Diameter

This paper presents an applicative methodology of parametric computer aided design using the CATIA v5 software to model and assembly a modular fixture device. The device is then used in the orientation and clamping a part of type casing cover which has a face machined by milling. Having a constructive solution of the fixture device, the next step is to simulate a milling process through a FEM analysis to identify the working conditions: milling tool diameter, number of teeth, cutting forces, required power of the machine tool etc. Some parameters were chosen according to various tools manufacturers catalogues and the cutting force components were determined experimentally in laboratory conditions. The analysis results show that in the FEM simulated milling process, in all the fixture device parts, some tensions cause displacements that have an influence over the casing cover surface roughness.

Determination of Muscle Orientations and Moment Arms

1984 ◽  
Vol 106 (3) ◽  
pp. 280-282 ◽  
Author(s):  
K. N. An ◽  
K. Takahashi ◽  
T. P. Harrigan ◽  
E. Y. Chao
Keyword(s):  
Muscle Force ◽  
Experimental Techniques ◽  
Force Analysis ◽  
Equilibrium Equations ◽  
Extensive Experience ◽  
Load Measurement ◽  
Moment Arms ◽  
Advantages And Disadvantages ◽  
Geometric Measurement

In muscle force analysis, orientations and moment arms of the muscles about a joint provide essential coefficients in the equilibrium equations. For the determination of these parameters, several experimental techniques, including geometric measurement, tendon-joint displacement measurement and direct load measurement, are available. Advantages and disadvantages associated with each of the techniques are reviewed and compared based on our extensive experience.

Determination of low 137Cs concentration in seawater using ammonium 12-molybdophosphate adsorption and chemical separation method

2008 ◽  
Vol 99 (12) ◽  
pp. 1815-1818 ◽  
Author(s):  
J.H. Park ◽  
B.U. Chang ◽  
Y.J. Kim ◽  
J.S. Seo ◽  
S.W. Choi ◽  
...  
Keyword(s):  
Chemical Separation ◽  
Separation Method ◽  
137Cs Concentration
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