popLA Manual (PDF) - Materials Science and Engineering

More documents

Recommendations

Info

The output is an .MPF file. Control is returned to the Massage Data menu. #9 Take Difference Between Two Pole Figures or ODs Sometimes it is helpful to take the difference between two pole figures or ODs, for example, in order to monitor textural evolution or to compare predictions with experiments. The program inspects the second line of both files for identity of the parameters. A warning is given if the two files do not appear to be similar enough for comparison – for example, a measured pole figure may say “(200)” and a calculated one “(001)”, in which case it is appropriate to compare the two pole figures and the warning should be ignored. The output of this option is a .DIF (difference) file. Control is returned to the Massage Data page menu. WIMV ANALYSIS (page 3) WIMV Analysis (popLA page 3) 0. Quit 1. Return to Page 1 WIMV: make .SOD and recalc pole figures .WPF -- for: 2. cubic, tetra-, hexagonal crystals; sample diad; up to 3 PFs, 13 poles 3. trigonal cry., gen’l.sample sym.,or higher: up to 7 PFs, 25 poles 4. orthorhombic crystal; sample Z-diad: up to 7 PFs, 25 poles **or: orthorh,/gen’l/7/25 **requires 386, DOS 5, and 4MB memory ** Recalculate POLE FIGURES (even non-measured ones): make .APF- 5. using .WIM matrix for the desired PFs (up to 3, 13 poles) 6. using .BMW matrix for the desired PFs (up to 7, 25 poles) 7. Calculate INVERSE pole figures from .SOD: .WIP 8. Make WIMV matrix for new crystal structure and set of PFs: 9. Make WIMV matrix for any INVERSE pole figures: make .WMI Please enter a number from 0 to 9 --> #0 Quit Quits program and returns control to DOS command shell #1 Return to Page 1 Returns to the main menu of popLA #2 Make SOD for High Symmetry Samples This option determines the sample orientation distribution (SOD) for high symmetry samples using the WIMV algorithm. (Displays a list of .WIM files in C:\X\ directory) ODF ANALYSIS - WIMV ALGORITHM COPYRIGHT (C) 1987, 1988 JOHN S. KALLEND Enter the name of the wimv matrix (c:\x\?.wim) [Default is CUBIC] ==> You don’t have to enter the .WIM extension. If a .WIM matrix which corresponds to your sample symmetry does not exist, you will have to make one using option #7. Name of data file (default extension .EPF): You do have to enter the extension here. Using a .FUL file from harmonic analysis usually helps WIMV converge faster. Sample Symmetry is: 0. Orthotropic 1. Diad on Z Enter 0 or 1 ==> 0 (Displays a list of pole figures in the data file) If you did use a .FUL data file for analysis, popLA displays Treat these as INCOMPLETE, OK? Y Press return for yes. popLA will then use only the data up to 80° of the pole figure, rather than the entire pole figure. Harmonic analysis helps to determine the intensities in the center more accurately but those extrapolated to high angles are not necessarily correct. popLA then displays information about the progress of the calculation, including the error of the ODF calculation and the texture "strength" (the root mean square density, i.e. the square root of the so-called "texture index"). DETAILS 26
After six iterations popLA asks if it should continue. Continue the iteration process until the error stops dropping rapidly. (Usually this is around 6 to 20 iterations.) An error of less than 5% is pretty good and indicates the pole figures used in the analysis are consistent with each other. Normalization factor: 0.95 This is the correction factor that popLA had to apply in order for the average intensity of the data file to be 1.0. The closer to one, the less fudging WIMV had to do. In output file, angles increase from 0 in nomenclature of 1. Kocks (need this one for WEIGHTS) 2. Roe/Matthies 3. Bunge (rotates plot +90 deg.) Enter 1,2, or 3 ==> 1 Normally you should select 1 because the other options in popLA will all work if the SOD is described in Kocks nomenclature. For more information about Euler angles, see Kocks (1988). The output of WIMV analysis is a .SOD file, a density file which contains the orientation distribution with respect to the sample axes (longitudinal, transverse, etc.) in the requested format. Also produced is a .WPF file, which contains the same pole figures used in the analysis, recalculated from the SOD. Compare these with the original pole figures and make sure they are reasonable. Usually they look sharper than the originals. #3 Make SOD for Lower Symmetry Sample This is similar to #2 except for samples with low symmetry or higher pole multiplicity. #4 Make SOD for Lower Symmetry Sample This is similar to #3 but also incorporates orthorhombic crystal symmetry. This option is faster than #3 and requires a 386, DOS 5 and at least 4MB of memory. #5 Recalculate Pole Figures, High Symmetry Once the orientation distribution is known, the pole figure of any {hkl} in the crystal can be calculated, given the appropriate .WIM matrix (which can be created under p.3#8 below). This option creates an .APF (arbitrary pole figure) file. #6 Recalculate Pole Figures, Low Symmetry Similar to #5, but for crystals of low symmetry. A .BWM matrix is used instead of .WIM matrix. (It can also be created under p.3#8.) #7 Calculate Inverse Pole Figures from .SOD Another way of displaying texture data is to plot a particular sample orientation the framework of the crystal axes; this is called an inverse pole figure . It is especially useful for "fiber textures" in which only one sample axis special. This option of popLA creates inverse pole figures using the SOD determined by WIMV analysis. Output is a .WIP (WIMV inverse pole figure) file. #8 Make WIMV Matrix Before WIMV analysis can be performed on a sample, a WIMV matrix which contains information on the crystal symmetry must be created. WIMV matrices already exist for many materials but need to be created for others. There are three sub-options: to create • a .WIM matrix for use with p.3#2 • a .BWM matrix for use with p.3#3 • a .WM3 matrix for use with p.3#4 #9 Make WIMV Matrix for Inverse Pole Figures This creates a WIMV matrix to project the .SOD onto an inverse pole figure for any sample direction. DETAILS 27
Page 1 and 2: LA-CC-89-18 popLA Preferred Orienta
Page 3 and 4: #5 Recalculate Pole Figures, High S
Page 5: INTRODUCTION What does popLA do? po
Page 9 and 10: TUTORIAL This section gives a quick
Page 11 and 12: Rotate Smooth The experimental pole
Page 13 and 14: • Opt for p.2#6 (via p.1), using
Page 15 and 16: • Now plot the .COD again, but in
Page 17 and 18: TUTORIAL 17 Figure 8 - DEMO.COS Squ
Page 19 and 20: . TUTORIAL 19 Figure 9 - DEMO.CMN
Page 21 and 22: DIOR This program goes the other wa
Page 23 and 24: #5 Conversions There are a number o
Page 25: Select one of the options and enter
Page 29 and 30: 0. Orthorhombic 1. Mirror perpendic
Page 31 and 32: DISPLAYS AND PLOTS (page 6) DISPLAY
Page 33 and 34: different resolution, toggle betwee
Page 35 and 36: #5 Yield Locus Section This routine
Page 37 and 38: Screendump For the best reproductio
Page 39 and 40: Harmonics Results Files Discrete Or
Page 41 and 42: demo Cu rol.90%,pt.reX 17 WIMV iter
Page 43 and 44: 24962496249624962496249624962496249
Page 45 and 46: APPENDIX C - Sample Coordinate Syst
Page 47 and 48: APPENDIX D - LApp DOCUMENTATION D1
Page 49 and 50: [3. KSYS shows up only for cubic SX
Page 51 and 52: 158.61 44.96 -161.52 .45 176.88 77.
Page 53 and 54: 28 =nvertex 8 1 2 0 0 0 0 2 3 5 6 9
Page 55 and 56: BCIN 1.12 .02 1.25 .01 2 28 taun ha
Page 57 and 58: ANAL c Result of SSS( 5 newton iter
Page 59 and 60: U. F. Kocks, The Sensitivity of Rol
Page 61 and 62: NOTE: If under option 1 and the rot

popLA Manual (PDF) - Materials Science and Engineering

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?