popLA Manual (PDF) - Materials Science and Engineering

PROPERTIES (page 7)
Properties (popLA page 7)
0. Quit
1. Return to page one
2. Assign Weights to discrete grains file from .SOD
(Need Kocks style Euler angles in both .SOD and TEXfilecan
convert the latter in DIOR, p.5,7)
3. Average elastic properties (Reuss, Voigt, Hill, self-consistent)
(Program by C. Tome) Input ELTEX.DAT, ELMOD.DAT; out ELOUT?.DAT
4. Simulation of polycrystal plasticity from weighted grain file -
LApp code: with rate sensitivity and grain shape effects,
for all crystal and sample symmetries,
calculate current yield surface, Lankford coefficients;
predict texture development, Taylor factors,
stress/strain curves for all straining paths.
SHEET properties directly from harmonic coefficients
(orthotropic plane strain cubic metals)
5. Yield locus section (11,22) for any angle in plane (Bishop-Hill)
6. Lankford coefficients (Hosford-Backofen model)
Please enter a number from 0 to 6 -->
#0 Quit
This option quits popLA and returns to DOS.
#1 Return to Page One
Selecting this option returns you to the main menu of popLA
#2 Assign Weights To Discrete Grains File
This option creates a .WTS file from a .SOD file.
popLA first lists the available weights files that can be used as inputs, and the conditions for which they
apply. The output file has the weights of the input file multiplied with the density in the appropriate box in the
.SOD; it assumes the specname of the .SOD, with the extension .WTS.
A detailed description is given in the TUTORIAL section of this manual. The following displays the screen
interaction, with some sample answers.
* Intensity file (w/ext: .SOP or . S?D, default =.SOD: TRY
* Enter the name of the [\dir\] grains file: TEXCUB.WTS
* Discard grains below a certain weight? 0.25
* Is this a file of triplets to be averaged ? 1
* How many orientations total? 768
* Do you wish to bring grains from outside the irreducible area into
it, by applying 360/PHI Max.-fold crystals z-axis? (Use 0 with
TEXLAT.WTS, TEXIS0.WTS,TEXCUB.WTS)--> 0
#3 Elastic Properties
This routine by C. Tomé calculates the Voigt and Reuss bounds on the elastic constants of the textured
polycrystal, given an input texture and the single crystal elastic constants. It will also estimate the polycrystal
elastic constants using the Hill average and a self-consistent method.
You need two input files:
• ELMOD.DAT, which contains the single-crystal properties. Use the sample provided and edit it. There are
also other options appended, which can be moved to the appropriate place.
• ELTEX.DAT, which is a standard .WTS file (in any Euler angles) except that the grain aspect ratios are
(currently) not calculated from F in the 3rd line, but need to be explicitly given as 3 number in this line.
When the first number is 0.0 (as usual for Evm in initial files), all aspect rations are assumed 1.0.
The output file ELOUT1.DAT contain all the various polycrystal moduli (labeled).
#4 Simulation of Polycrystal Plasticity
This option displays only rudimentary instructions on how to use LApp, a polycrystal plasticity code based on the
Taylor model. This routine requires the texture be represented by a set of weighted discrete orientations (.WTS
file). Further instructions can be found at the end of this manual.
DETAILS 34