scholarly journals Calculation of Microstresses in Textured Polycrystals With Cubic Crystal Symmetry

1999 ◽  
Vol 32 (1-4) ◽  
pp. 309-319
Author(s):  
E. A. Mityushov ◽  
S. A. Berestova
Keyword(s):  
Static Loading ◽  
Crystal Symmetry ◽  
Stress Fields ◽  
Cubic Crystal ◽  
Cubic Symmetry ◽  
Analytic Determination

The problem of the analytic determination of microstresses in textured polycrystals with cubic symmetry under general static loading has been solved. The solution is based on the expansion of macroscopic and microscopic stress fields into hydrostatic and deviatoric portions. This essentially simplifies the description of microstresses in polycrystals.

The determination of the space group of a cubic crystal

1922 ◽  
Vol s5-4 (21) ◽  
pp. 175-187
Author(s):  
R. W. G. Wyckoff
Keyword(s):  
Cubic Crystal ◽  
Space Group

Analytic Determination of Wrench Closure Workspace of Spatial Cable Driven Parallel Mechanisms

2015 ◽  
Author(s):  
Zhiyu Sheng ◽  
Joon-Hyuk Park ◽  
Paul Stegall ◽  
Sunil K. Agrawal
Keyword(s):  
Simulation Study ◽  
Null Space ◽  
Boundary Surface ◽  
Parallel Mechanisms ◽  
Analytic Determination ◽  
Structure Matrix ◽  
Feasible Solutions

This paper proposes an efficient way of determining analytically the Wrench Closure Workspace (WCW) of spatial redundant cable-driven parallel mechanisms (CDPM). The method builds upon the boundary surface equations obtained from the null space of the structure matrix of CDPM. The set of feasible solutions is obtained that satisfies positive tension in the cables. This method was applied to characterize the WCW of spatial CDPM which has redundancy of 1 or 2. A simulation study was carried out to validate the accuracy and efficiency of the method. Several advantages over conventional approaches for determining the WCW were identified through simulation.

scholarly journals Integration, scaling, space-group assignment and post-refinement

2010 ◽  
Vol 66 (2) ◽  
pp. 133-144 ◽  
Author(s):  
Wolfgang Kabsch
Keyword(s):  
Data Reduction ◽  
Efficient Algorithm ◽  
Spot Size ◽  
Crystal Symmetry ◽  
Automatic Determination ◽  
Scaling Factors ◽  
Space Group ◽  
Group Assignment ◽  
Software Packages

Important steps in the processing of rotation data are described that are common to most software packages. These programs differ in the details and in the methods implemented to carry out the tasks. Here, the working principles underlying the data-reduction packageXDSare explained, including the new features of automatic determination of spot size and reflecting range, recognition and assignment of crystal symmetry and a highly efficient algorithm for the determination of correction/scaling factors.

Analytic Determination of Slip and Efficiencies of Rolling Contact C.V.T.’s With Experimental Verifications

1986 ◽  
Vol 108 (1) ◽  
pp. 72-76 ◽  
Author(s):  
J. Modrey ◽  
Y. K. Younes
Keyword(s):  
Computer Simulation ◽  
Rolling Contact ◽  
Analytic Determination ◽  
Continuously Variable Transmissions ◽  
Fluid Properties ◽  
Good Guide ◽  
Parallel Tests

Rolling contact continuously variable transmissions (C.V.T.) transmit forces through a highly viscous spot between rolling-slipping contacts. The mechanics of the spot are characterized by complex elastohydrodynamic conditions and fluid properties only partially determinable at the extreme pressures of operation. A computer simulation of the spot mechanics based on extensions of research in less complex elastohydrodynamic situations was developed. Comparisons with parallel tests on a commercial C. V. T. verify that the simulation described in a good guide to design of this class of transmissions.

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