HP 48gII - Manual (Page 756)

Page 22-40
J@MOHRC
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 find the values of the stresses corresponding to a rotation of 35
o in the
angle of the stressed particle, we use:
$š
Clear screen, show PICT in graphics screen
@TRACE @(x,y)@. To move cursor over the circle showing φ and (x,y)
Next, press
™ until you read φ = 35. The corresponding coordinates are
(1.63E0, -1.05E1), i.e., at φ = 35 o , σ’
xx
= 1.63 kPa, and σ’
yy
= -10.5kPa.
An input form for the Mohr’s circle program
For a fancier way to input data, we can replace sub-program INDAT, with the
following program that activates an input form:
« “MOHR’S CIRCLE” { { “σx:” “Normal stress in x” 0 }
{ “σy:” “Normal stress in y” 0 } { “τxy:” “Shear stress”
0} } { } { 1 1 1 } { 1 1 1 } INFORM DROP »
With this program substitution, running
@MOHRC will produce an input form as
shown next: