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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@8663 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp 2012-08-14 22:59:55 +00:00
parent 7487754a4d
commit c0f36fd0af
2 changed files with 24 additions and 20 deletions
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22
doc/fix_deform.html
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@ -327,17 +327,19 @@ direction for xy deformation) from the unstrained orientation.
</P>
<P>The tilt factor T as a function of time will change as
</P>
<PRE>T(t) = T0 + erate*dt
<PRE>T(t) = T0 + L0*erate*dt
</PRE>
<P>where T0 is the initial tilt factor and dt is the elapsed time (in
time units). Thus if <I>erate</I> R is specified as 0.1 and time units are
picoseconds, this means the shear strain will increase by 0.1 every
picosecond. I.e. if the xy shear strain was initially 0.0, then
strain after 1 psec = 0.1, strain after 2 psec = 0.2, etc. Thus the
tilt factor would be 0.0 at time 0, 0.1*ybox at 1 psec, 0.2*ybox at 2
psec, etc, where ybox is the original y box length. R = 1 or 2 means
the tilt factor will increase by 1 or 2 every picosecond. R = -0.01
means a decrease in shear strain by 0.01 every picosecond.
<P>where T0 is the initial tilt factor, L0 is the original length of the
box perpendicular to the shear direction (e.g. y box length for xy
deformation), and dt is the elapsed time (in time units). Thus if
<I>erate</I> R is specified as 0.1 and time units are picoseconds, this
means the shear strain will increase by 0.1 every picosecond. I.e. if
the xy shear strain was initially 0.0, then strain after 1 psec = 0.1,
strain after 2 psec = 0.2, etc. Thus the tilt factor would be 0.0 at
time 0, 0.1*ybox at 1 psec, 0.2*ybox at 2 psec, etc, where ybox is the
original y box length. R = 1 or 2 means the tilt factor will increase
by 1 or 2 every picosecond. R = -0.01 means a decrease in shear
strain by 0.01 every picosecond.
</P>
<P>The <I>trate</I> style changes a tilt factor at a "constant true shear
strain rate". Note that this is not an "engineering shear strain

22
doc/fix_deform.txt
View File

@ -317,17 +317,19 @@ direction for xy deformation) from the unstrained orientation.
The tilt factor T as a function of time will change as
T(t) = T0 + erate*dt :pre
T(t) = T0 + L0*erate*dt :pre
where T0 is the initial tilt factor and dt is the elapsed time (in
time units). Thus if {erate} R is specified as 0.1 and time units are
picoseconds, this means the shear strain will increase by 0.1 every
picosecond. I.e. if the xy shear strain was initially 0.0, then
strain after 1 psec = 0.1, strain after 2 psec = 0.2, etc. Thus the
tilt factor would be 0.0 at time 0, 0.1*ybox at 1 psec, 0.2*ybox at 2
psec, etc, where ybox is the original y box length. R = 1 or 2 means
the tilt factor will increase by 1 or 2 every picosecond. R = -0.01
means a decrease in shear strain by 0.01 every picosecond.
where T0 is the initial tilt factor, L0 is the original length of the
box perpendicular to the shear direction (e.g. y box length for xy
deformation), and dt is the elapsed time (in time units). Thus if
{erate} R is specified as 0.1 and time units are picoseconds, this
means the shear strain will increase by 0.1 every picosecond. I.e. if
the xy shear strain was initially 0.0, then strain after 1 psec = 0.1,
strain after 2 psec = 0.2, etc. Thus the tilt factor would be 0.0 at
time 0, 0.1*ybox at 1 psec, 0.2*ybox at 2 psec, etc, where ybox is the
original y box length. R = 1 or 2 means the tilt factor will increase
by 1 or 2 every picosecond. R = -0.01 means a decrease in shear
strain by 0.01 every picosecond.
The {trate} style changes a tilt factor at a "constant true shear
strain rate". Note that this is not an "engineering shear strain