HP 48gII - Manual (Page 755)

Page 22-39
The result is:
Ordering the variables in the sub-directory
Running the program MOHRCIRCL for the first time produced a couple of new
variables, PPAR and EQ. These are the Plot PARameter and EQuation
variables necessary to plot the circle. It is suggest that we re-order the
variables in the sub-directory, so that the programs
@MOHRC and @PRNST are the
two first variables in the soft-menu key labels. This can be accomplished by
creating the list { MOHRCIRCL PRNST } using:
J„ä@MOHRC @PRNST `
And then, ordering the list by using: „°@)@MEM@@ @)@DIR@@ @ORDER.
After this call to the function ORDER is performed, press
J. You will now
see that we have the programs MOHRCIRCL and PRNST being the first two
variables in the menu, as we expected.
A second example of Mohr’s circle calculations
Determine the principal stresses for the stress state defined by σ
xx
= 12.5 kPa,
σ
yy
= -6.25 kPa, and τ
xy
= - 5.0 kPa. Draw Mohr’s circle, and determine
from the figure the values of σ’
xx
, σ’
yy
, and τ’
xy
if the angle φ = 35 o .
To determine the principal stresses use the program
@PRNST, as follows:
J@PRNST
Start program PRNST
12.5˜ Enter σx = 12.5
6.25\˜ Enter σy = -6.25
5 \` Enter τxy = -5, and finish data entry.
The result is:
To draw Mohr’s circle, use the program @MOHRC, as follows: