scholarly journals The Determination of Anisotropy Coefficients when Replacing the Actual Structure by a Structurally Anisotropic Solid Model

2017 ◽  
Author(s):  
О.В. Короткая ◽  
Keyword(s):  
Solid Model ◽  
Actual Structure ◽  
Anisotropic Solid ◽  
Anisotropy Coefficients

Structure Refinements in Chemistry and Physics. A Comparative Study Using the Rietveld and the Two- Step Method

1989 ◽  
Vol 33 ◽  
pp. 261-268 ◽  
Author(s):  
G. Will ◽  
E. Jansen ◽  
W. Schäfer
Keyword(s):  
Powder Diffraction ◽  
Structure Refinement ◽  
Powder Diffraction Data ◽  
Line Broadening ◽  
Step Method ◽  
Actual Structure ◽  
Structural Calculation ◽  
On Line ◽  
The Individual

Two strategies are at present commonly used in studying and refining crystal structures from powder diffraction data: the total pattern refinement proposed by Rietveid (1969) and the two-step method originally proposed and applied by Will (Will et al., 1965). The latter one works by separating-the intensity determination of the individual peaks from the actual structure refinement, structure analysis or any structural calculation (tor example based on line broadening). Both methods have their merits, and their drawbacks.

scholarly journals Research on Deterioration Mechanism of Concrete Materials in an Actual Structure

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Shiping Zhang ◽  
Xiang Dong ◽  
Houxian Zhang ◽  
Min Deng
Keyword(s):  
Concrete Structure ◽  
Frost Resistance ◽  
Field Survey ◽  
Petrographic Analysis ◽  
Actual Structure ◽  
Freeze Thaw ◽  
Alkali Aggregate Reaction ◽  
Deterioration Mechanism ◽  
Concrete Materials

The cause for deterioration of the concrete structure located in severe environment has been explored both in field and in laboratory. Serious cracking and spalling appeared upon surface of the concrete structure soon after the structure was put into service. Both alkali-aggregate reaction and freeze-thaw cycles may result in similar macro visible cracking and spalling. The possibility of alkali-aggregate reaction was excluded by both field survey and lab examination such as chemical analysis, petrographic analysis, and determination of alkali reactivity of aggregates. According to results of freeze-thaw cycles, impermeability testing, and microstructure analysis, it is deduced that the severe environmental conditions plus the relatively inferior frost resistance cause the deterioration of concrete. Usage of air entraining admixture can improve frost resistance and impermeability. Furthermore, new approaches to mitigate the deterioration of concrete used in severe environmental condition are discussed.

Determining the Anisotropy Coefficients of an Ultra Fine Grained Al6082 Alloy Subjected to ECAP

2007 ◽  
Vol 537-538 ◽  
pp. 215-222
Author(s):  
György Krállics ◽  
Arpad Fodor
Keyword(s):  
Constitutive Equation ◽  
Yield Stress ◽  
Continuum Mechanics ◽  
Equivalent Stress ◽  
Strain Curve ◽  
Equivalent Strain ◽  
Rigid Plastic ◽  
Fine Grained ◽  
Anisotropy Coefficients

Bulk Al6082 alloy is subjected to ECAP using route Bc. This paper focuses on the determination of the anisotropy coefficients and equivalent stress-equivalent strain curve using continuum mechanics equations. Assuming the material to be rigid-plastic, the parameters of the constitutive equation are determined with the aid of measuring the deformation and the uniaxial yield stress during upsetting tests in three perpendicular directions.

Simplified analysis of wall-frame structures

1978 ◽  
Vol 5 (2) ◽  
pp. 262-273 ◽  
Author(s):  
O. Moselhi ◽  
P. Fazio ◽  
Z. Zielinski
Keyword(s):  
Orthotropic Plate ◽  
Rapid Determination ◽  
Frame Structures ◽  
Direct Integration ◽  
Lateral Loads ◽  
Actual Structure ◽  
Simplified Method ◽  
Internal Forces ◽  
Simplified Analysis

A simplified method is presented for the analysis of planar, uniformly perforated walls under the action of lateral loads. The method is based on replacing the perforated wall by an elastically equivalent orthotropic plate. The principle of minimum total complementary potential energy is then used to determine stresses and displacements in the equivalent plate. Internal forces in the actual structure are obtained by direct integration of these stresses. An example is worked out to illustrate the application of the method and its accuracy. Design curves are presented for the rapid determination of internal forces.

Analytical Cut Geometry Prediction for Free Form Surface During Semi-Finish Milling

2013 ◽  
Author(s):  
Hendriko ◽  
Emmanuel Duc ◽  
Gandjar Kiswanto
Keyword(s):  
Computational Time ◽  
Free Form ◽  
Depth Of Cut ◽  
Solid Model ◽  
Workpiece Surface ◽  
Engagement Angle ◽  
Rough Milling ◽  
Five Axis ◽  
Toroidal Cutter

In five-axis milling, determination of continuously changing Cutter Workpiece Engagement (CWE) is still a challenge. Solid model and discrete model are the most common method used to predict the engagement region. However, both methods are suffering with the long computational time. This paper presents an analytical method to define CWE of toroidal cutter during semi-finishing of sculpture part. The workpiece from 2.5D rough milling is represented by a number of blocks. The length of cut at every engagement angle can be determined by calculating the outermost engagement point called upper CWE point. This point was determined by first assumed that the workpiece surface is flat. A recalculation for CWE correction is then performed for the engagement occurred in two workpiece blocks. The method called Z-boundary and X-boundary are employed to obtain the upper CWE point when the engagement occurred on toroidal side. Meanwhile Cylinder-boundary method was used when the engagement occurred on the cylinder side. The developed model was examined to ensure its accuracy. A sculptured surface part was tested by comparing the depth of cut generated by the simulation developed and the depth of cut measured by Unigraphic. The result indicates that the proposed method is very accurate. Moreover, due to the method is analytically, and hence it is efficient in term of calculation time.

Design Guidelines for Dynamic Stability of Tainter Gates

2017 ◽  
Author(s):  
Keiko Anami ◽  
Noriaki Ishii ◽  
Charles W. Knisely ◽  
Tatsuya Oku
Keyword(s):  
Dynamic Stability ◽  
Fem Analysis ◽  
Design Guidelines ◽  
Design Stage ◽  
Actual Structure ◽  
Analysis And Design ◽  
Coupled Mode ◽  
Excited Vibration ◽  
Vibration Tests

To ensure the long-term safe operation of newly constructed Tainter gates, methods of analysis and design criteria are needed in the design stage to assure the dynamic stability of any new Tainter gate. For this purpose, the present study provides a detailed procedure for the dynamic design of Tainter gates that can be applied to preliminary designs by gate engineers to assure the dynamic stability of their gate designs. The dynamic stability of the gate can be determined using the natural vibration characteristics ascertained by finite element method (FEM) analysis, reasonable values of actual structure damping actually measured by the field vibration tests, and theoretical analysis of the coupled-mode self-excited vibration that has been previously established by authors. The procedure and the important points of each step are detailed in an example determination of the dynamic stability of a practical Tainter gate.

Determination of elastic characteristics of flexible cables on basis of model of helically anisotropic solid

1984 ◽  
Vol 20 (1) ◽  
pp. 122-128 ◽  
Author(s):  
V. M. Musalimov ◽  
S. Ya. Mokryak ◽  
B. V. Sokhanev ◽  
V. D. Shiyanov
Keyword(s):  
Anisotropic Solid ◽  
Flexible Cables ◽  
Elastic Characteristics
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